What to do if the Windows in the House Sweat? Causes, Solutions

Window glass exhibits high sensitivity to indoor air humidity. When the outside temperature drops, they often become covered with fine mist or droplets of water. This is a rather dangerous effect, since moisture has a negative effect on most materials, contributes to the destruction of building structures and corrosion of metal parts.

When water freezes, it expands, enlarging any cracks and crevices where it has managed to penetrate. What to do if, when cold weather sets in, the windows in your apartment sweat heavily from the inside, what should you do to eliminate the causes of this phenomenon? Let's consider possible solutions to the problem.

What is the problem

What is the problem with foggy windows anyway? In general, condensation appears on windows as a result of a sharp temperature change. Conventional physics can explain this, or rather the transition of a liquid from a gaseous to a liquid state.

When there is a lot of vapor in the air, it turns into liquid when it collides with cold surfaces. The coldest point in the house is the window, so that's where condensation appears.

The windows are foggy from the outside. This situation is extremely rare

Oddly enough, windows can fog up in different ways.

Here are some of the most common scenarios:

Condensation appears with the onset of cold weather. This situation is the most common; condensation forms when the temperature drops to a certain level. When the air temperature rises, the windows stop sweating
The windows are sweating in the kitchen. This is natural, because the kitchen is constantly cooking. The temperature in the room is constantly changing, which leads to fogging of the window
The window only sweats in one room. This problem occurs due to certain features of the room itself, or due to problems directly with this window
The window only sweats in the morning. Closer to lunch, the condensation completely disappears, and the window remains dry

Low room temperature

If the humidity is within normal limits, but the windows still fog up, the problem may be low indoor air temperatures. The above-mentioned GOST provides an optimal temperature for living rooms of about +20...+22°C. If it drops below these values at negative air temperatures outside the window, condensation is likely. In this case, it is necessary to solve the problem with heating the room: flush or replace the radiators, contact the management company or install an additional heat source (for example, an inverter air conditioner).

A radiator should be installed under each window in the apartment, as it acts as a thermal curtain and heats the glass. Ideally, the width of the radiator should be close to the width of the window.

Correct installation of a heating radiator.

Condensation due to low temperatures can be observed in private houses with autonomous gas or stove heating. The air is heated at time intervals, so in the absence of heating, drops of water form on the glass after a few hours.

Why do windows sweat?

To understand how to solve the problem of window fogging, you need to find out what reasons can lead to this.

Flowers on the windowsill are one of the most common causes of condensation on windows

As a rule, this problem manifests itself for a number of the following reasons:

1 High level of humidity in the room. This problem often causes kitchen or bathroom windows to fog up. If there is high humidity in the room, condensation will form on the windows. Frequent cooking leads to a worsening of the situation, faulty ventilation or hood, drying clothes after washing.

2 Poor circulation of heat from various heating sources. This problem most often occurs in the fall or spring, when it is still cold and humid outside and the indoor temperature is not warm enough. Warm air does not enter the lower part of the window sill, especially if it is wide, and condensation forms in this place.

3 Incorrectly installed windows. Experienced installers carry out this work in accordance with all standards, so no problems arise. Those who charge less for work cannot guarantee a high-quality result; they are usually in a hurry and perform the installation with deviations from the norm. In such situations, the structure is not completely sealed, and cold air can penetrate into the middle of the room. Another problem during installation is level mismatch. Over time, the window frame warps and the seal is broken. This can cause problems not only in the formation of condensation, but also in the operation of the window as a whole: opening the sash, operating the fittings, etc. If you install it yourself, the scenario is approximately the same, without experience, if something goes wrong you won’t even be aware of this before the first signs of a problem appear.

4 Poor quality glass unit. This problem also often arises due to the desire to save money. Poor insulation or faulty fittings in windows allow cold air to enter, causing condensation to form.

5 Double-glazed window. This is the so-called cold glazing system, which is used only for non-residential premises. This design does not have sufficient thermal insulation properties, which leads to the appearance of condensation.

6 The fittings are not adjusted correctly. During seasonal temperature changes, the profile can expand and contract. Therefore, window fittings are adjusted according to the season. Otherwise, the seal of the window may be broken and it will begin to sweat.

7 The insulation has worn out or was initially of poor quality. All window structures are equipped with a seal, which is located along the contour of the sash. It tends to wear out or harden over time. In cheap models this happens faster, so the window “sweats”.

8 Clogged drain holes. You can find them at the bottom of the opening sash. Their purpose is to allow water to flow down the outside of the glass when the sash is in ventilation mode. When the drainage holes are clogged, water flows onto the windowsill indoors.

9 Plant on the windowsill. If the flowers are very close to the window, there is a high probability that condensation will begin to form. Plants release moisture or it evaporates after watering.

Reasons for fogging of plastic windows

There can be many reasons why plastic windows sweat from the inside. And to eliminate the problem, you cannot do without identifying the causes. So, the problem may occur due to:

Increased humidity in the air in the room - for example, when cooking, drying clothes, and so on.
Air circulation problems in the apartment. If in winter the radiators are only slightly warm, and it is very cold outside, then the plastic windows cannot be heated to the proper extent.
If the radiators are hot and the windows still fog up, you need to check the window sill - it may turn out that its overhang is too large and blocks the flow of heat to the window area. Protective screens on batteries can also lead to this - because in this way the heat spreading throughout the apartment does not cover the lower part of the window, which is why condensation forms here.
Lack of high-quality ventilation - it may become clogged or not work at all, so moist air cannot be extracted.
Plastic windows may fog up if the apartment or balcony is being renovated, or immediately after it is completed. After all, all freshly laid finishing materials (wallpaper and even ceramic tiles) release a large amount of moisture into the room, which will settle on the windows.

Incorrect installation of a plastic window. This means that your windows were installed with a gross violation of technology - poor-quality sealing of the gap between the profile and the window opening.

In addition, the low tide is very often installed incorrectly - it is simply screwed to the window. The ebb should be placed on a pre-prepared mortar base - this will create a sealed layer, protect it from moisture and cold, as well as from noise in case of strong wind.

The window can also be installed out of level - the resulting misalignment leads to the fact that the sealing gaskets of the window sashes do not fit tightly.

Low-quality fittings can also play a role - because of them, the window sashes will not close tightly. Fittings installed in violation of the rules will have the same effect.

Improper performance of work on insulation of external or internal slopes. They definitely need to be insulated and this should be done efficiently.

Foam plastic is suitable as external insulation. You should also use cement mortar - it is used to seal the cracks where the window meets the opening. When working with internal slopes, foam plastic is not used - here preference is given to basalt slabs or glass wool (mineral insulation).

Poor quality seal - then a gap appears between the glass unit and the frame through which cold air passes.

Incorrect adjustment of a plastic window - insufficient fit of the sashes, incorrectly installed fittings, and so on.

Dew point concept

Dew point is the temperature at which water changes from a gaseous state to a liquid. This point is located in the thermally insulating layer of the wall, and is located at different levels in different situations. This point cannot be detected visually; it is only marked on the graph.

The dew point is directly proportional to the humidity level in the room

The most important rule is that condensation forms due to temperature and humidity. The lower the humidity in the room, the lower the dew point.

Factors that influence dew point:

outside temperature
wall thickness
room temperature
indoor humidity
humidity outside

Causes of window fogging

Excessive moisture should be named first. A person himself evaporates about 2–3 liters of water per day. And this is on average under normal conditions. Living plants in pots also produce moisture.

If we talk about an apartment or house, then the microclimate is also affected by using a washing machine, cooking, taking a bath or shower. The relative humidity in residential premises should be in the range of 50-65%.

In connection with the first point, the question arises as to why excess water remains in the room. Apartments and houses usually do not have good ventilation. Fresh air enters there through windows and doors and moisture is removed in the same way. This, as can be seen from practice, is not enough.

Temperature change. People notice condensation on plastic windows mostly during the cold season or in the off-season. Why is that? Condensation is equally affected by both humidity and temperature.

There is such a concept - dew point. This is the temperature at which the vapor contained in the air collects into droplets of water, since the air cannot hold it. The glass surface is the coldest place in the house.

At a sufficiently high relative humidity, when the temperature of the glass inside the room reaches a certain level, it passes the dew point and we get condensation on the windows. A demonstration of this phenomenon can be a glass vessel taken out of the refrigerator - the same processes occur with it.

Another factor that is directly related to temperature is the location of the house according to the cardinal directions. Windows facing north will certainly be colder than those facing south.

Accordingly, the moisture that has already formed on them will evaporate much longer, which means it will have a longer effect on the double-glazed window itself.

Why do you need to remove condensate?

Complete sealing of plastic windows can disrupt the natural microclimate in the room. While wooden structures can “breathe,” completely sealed PVC windows prevent natural air circulation.

Condensation is one of the reasons for the appearance of fungus

If condensation forms on the windows, then the microclimate in the room is unfavorable for human health. Because of this, pathogenic bacteria, fungus and mold can develop in the room.

For a person, ideal living conditions are considered to be 20-22 degrees Celsius and 30-45% humidity in the room. Condensation on the windows is the first sign that the atmosphere in the room does not meet these requirements. To return a favorable atmosphere to the room, this problem must be eliminated.

Plastic windows leak when it rains

If it happens that during rain water flows through plastic windows, and you don’t know what to do. Don’t rush to panic, we will help you fix this problem and tell you why moisture is getting in.

Reasons for window leaks:

Installation errors. Most likely, even when installing the window, the technology of insulation and sealing of seams was violated and because of this the plastic window is leaking.
The seal has lost its properties, has become depleted, and has dried out. But this only happens if the sealing rubber has been in use for a long time.
Incorrectly made slopes.
There is a small amount of foam in the openings or it is of poor quality.
The drainage is poorly inserted, or it cannot cope with such a volume of water, or it is completely clogged.
In addition to the leakage of a plastic window during rain, there is another cause for concern - rubbing and fogging of the glass from the inside, the appearance of condensation.

Reasons for the appearance of moisture inside PVC windows:

Poor quality glass. Often, unscrupulous manufacturers make it from cheap and low-quality materials; subsequently, the double-glazed window does not fully perform its heat-protective function, the glass freezes and condensation appears.
Insufficient ventilation. You just need to skillfully use the microventilation mode, ventilate the rooms regularly, 10–15 minutes of ventilation per day will be enough.
Increased humidity in the house. Especially in the kitchen, while cooking or boiling water.
Incorrect installation, the window is blown out in places and moisture loss is inevitable in winter.
If a window leaks during renovation, this is normal, because building materials contain moisture and gradually release dampness to the air.

Condensation and wooden windows

As a rule, in houses with wooden windows the problem of fogging is not known. This is due to the structure of the wood itself, which allows air to circulate and they are not as airtight as plastic ones. This way the room maintains a normal level of humidity.

Wooden windows rarely sweat, but if this problem occurs, immediate action must be taken

Modern window designs are completely sealed. On the one hand, this is good, because the room becomes much quieter and warmer after their installation. This prevents air from circulating as it was originally intended.

To get rid of condensation, sometimes it’s enough just to ventilate the room daily. This will help natural air circulation and prevent fogging. In addition, some modern window systems have special channels for micro-ventilation. But wooden windows can also sweat, but why does this happen?

Why do wooden windows sweat?

Using a fan heater, you can blow off foggy windows

As in other cases, the first reason for the formation of condensation is excess humidity in the room. If the air humidity is more than 50%, this is immediately reflected in fogged windows.

To get rid of condensation on the windows, arrange for them to be blown with warm air. To do this, you can use a heat gun, fan heater, air dehumidifier, etc.

Incorrect installation of radiators can also cause this problem. If the radiator is located far from the windows, it will most likely not be possible to completely get rid of the appearance of dew. For normal air circulation, the radiator will have to be placed in the correct place. In addition, a cold wall that is not heated by a radiator will also cause frost to form on the window.

Poor installation or wear of windows

If not only the windows, but also the slope fog up, and in severe frosts ice or frost forms on the surface of the plastic, the builders probably saved on foam, the installation seam was made incorrectly, or there are cold bridges. In this case, you should contact the company where the windows were ordered. The technology for installing windows is described in detail in GOST 30971-2002.

The result of poor fit of the sash.

Fogging and icing can be observed around the perimeter of the sash contact with the frame. The reasons for this are sagging doors and worn out rubber seals. To fix the problem, it is necessary to adjust the position of the sash with a window hex key and completely replace the sealing rubber.

Important! When cold weather sets in, it is necessary to change the sash pressure to winter mode.

If the windows were installed in the summer, most likely the pressure is set for the warm season; it is less strong than in the winter, so more intense air cooling and condensation may occur. It is not recommended to use the winter clamp all year round, as this will wear out the sealing rubber faster.

Pressure adjustment according to the time of year.

A rare but possible cause of severe fogging is the installation of single-chamber double-glazed windows in a heated residential room, in areas with a very cold climate. If this was done with the consent of the owner of the premises, then it will be difficult to file a claim against the installers. There is only one way out - to change the double-glazed windows to double-chamber ones, consisting of three glasses, and along with them you will have to replace the glazing bead.

Condensation between glasses, what to do

If condensation at the bottom of a plastic window, or along its entire surface on the inside of the window, is a common occurrence, then fogged windows from the inside are much less common. Most often this occurs due to depressurization of the structure.

Condensation inside the glass unit

This may happen for the following reasons:

The product was released with a defect . This happens when they want to save money when purchasing and buy windows from an untrusted manufacturer. Another reason may be a violation of window manufacturing technology.
window damage during transportation . If, during transportation of the product, chips or cracks appeared on the window, the gas or compressed air that fills the space between the double-glazed windows could escape. It could also be possible to remove the layer of sealing sealant.
if the owner of the windows carries out some manipulations with the product , disassembles them and puts them back together, the gas also comes out, and after assembly it was not sealed back. If a glass unit was disassembled, its original properties were lost in 90% of cases

If condensation begins to form between the glasses, the only solution is to completely replace the double-glazed window with a new one. A professional can replace a double-glazed window in just half an hour, but you can do this work yourself. In addition, a new double-glazed window is not expensive at all.

Useful tips on how to deal with condensation

Regular ventilation is important to prevent “dew on the windows” and for human health.

Sometimes a problem catches you by surprise, and you have to look for a solution literally on the fly.

If for some reason it is not possible to find the root of the problem, professionals recommend preventing window fogging using the following recommendations:

If condensation appears on your windows, first of all you should remove all plants from the windowsill. Plants evaporate moisture, which is when problems arise.
Ventilate your apartment regularly. Spend 10-15 minutes daily on this, let it become a kind of ritual
You need to install a hood in the kitchen. With its help, most of the moisture that appears during cooking will be absorbed. This will help reduce the humidity level in the room itself and prevent condensation. You also need to adjust the draft of the device; if it is too strong, the result may be the opposite.
Windows need to be inspected regularly for damage. Carefully check the fittings once a year and the seals for wear. If necessary, faulty parts must be replaced
Once a season, the fittings must be switched to winter or summer mode
try to increase the air temperature in the room. In some situations, this is enough, and when the temperature stabilizes, condensation stops forming
make a window sill already. This is relevant if “dew” appears mainly at the bottom of the window. This means that the heat from the battery does not reach this area
make an additional hole for ventilation under the window sill. It must be end-to-end. Additional ventilation will increase air circulation and possibly prevent condensation.

Ventilating the room can not only help combat condensation, but will also be beneficial for the health of the inhabitants of your home.

The causes of condensation can be completely different. In some cases, the problem is minor, for example the same flowers. Therefore, before taking drastic measures, it is worth taking these preventive actions.

How to wipe windows to prevent sweating inside in winter

To eliminate condensation, you need to choose the right window demisting agent:

A wax candle is the most common folk remedy for normalizing the climate in a room. Place several candles on the windowsill so that they continue to burn all day and warm the glass. Due to air convection from the flame, condensation does not settle on the glass. As a result of the combustion procedure, carbon dioxide, which is beneficial for plants, is released, so the greens can be left on the windowsill. Pay particular attention to safety and remove items that could easily catch fire.
Soap . “Rub” a mesh with small cells on the glass with toilet soap. Smear the marks until shiny with a clean microfiber cloth.
Glycerin . Combine ethyl alcohol with glycerin until smooth in one container, based on the proportions 20/1. Pour the composition into a spray bottle and treat the glass. Polish any stains dry. When the processing is completed, the alcohol will evaporate, and a thin film of glycerin will remain on the glass for a long time.
Shaving foam . Squeeze a thin layer of foam or gel onto the glass, wipe with paper or a napkin until it shines.
Dry windows can be wiped with the pulp of half a cut lemon , after which the surface is treated dry with a towel.
Salt . A cloth bag filled with salt is placed between the doors. The grains will absorb excess moisture well.
Toothpaste . Apply toothpaste to a sponge or microfiber cloth and vigorously wipe the glass dry. You can also clean the surface with tooth powder.

Important! It is better to burn thick scented candles that burn for a long time and bring a touch of comfort to the interior of the room.

Mold is a companion of foggy windows, what to do about it

Mold must be dealt with immediately

One of the most unpleasant consequences of frost on windows is mold. If you do not pay attention to the formation of condensation and start the problem, this can lead to more serious consequences, or rather, fungus and mold. And what to do when the slopes are covered with mold?

When you notice the appearance of black spots around the windows, you should take care of removing this plaque. To do this, you can use various chemical compounds, including bleach or an alcohol solution. After removing plaque, you need to make it a rule to regularly ventilate the room. Such precautions are taken only in winter.

With the onset of warmer weather, it is necessary to take more serious measures and completely remove mold-affected areas of plaster and replace it with new one. After the new layer has dried, it must be treated with an antiseptic.

How to get rid of condensation using traditional methods

To combat condensation, you can use traditional methods. They are more gentle on the structure itself, but these methods effectively cope with the problem.

Method 1

An old and proven way to deal with “dew” and ice on the window is a candle.

An ordinary wax candle can help in the fight against fogging of windows. It works in the case of double-glazed windows and the formation of frost on the windows. This method has been used for several decades; this method has been used to remove ice from windows. Several candles are placed on the windowsill along its entire length. They warm up the glass and prevent ice from forming.

Many people recommend using thick candles. They burn slower and will last longer. At the same time, with the help of such candles you can “brighten up” the interior of the room a little, making it more comfortable. If desired, candles can be scented.

When a candle burns, it releases carbon dioxide. If there are indoor plants on the windowsill, this can be an excellent feed for them, and you won’t have to remove the flower pots.

Method 2

Properly washed windows will prevent condensation from forming. But for this you need the right solution

Sometimes cleaning your windows properly can help. Depending on the original cause of condensation, sometimes this is enough. Of course, the “success” of such a struggle can be expressed in varying degrees, but sometimes it helps.

For washing you need to use:

soft, lint-free cloth
microfiber cloth
newspapers for wiping
soap solution
glycerol
alcohol (you can use vodka)
shaving foam
car window anti-fog spray
rubber scraper

A window with a fatty layer is most likely to fog up. That is why the “fight” against condensation must begin by cleaning the windows with alcohol.

This will degrease the surface, and the work is carried out as follows:

first of all, the windows need to be washed in the usual way using a soap solution
glass must be wiped dry with a lint-free cloth
remove remaining moisture from the surface using a rubber scraper
Alcohol is applied to the sponge and the entire surface of the glass unit is treated with it.
waiting for the window to dry completely

This way, the surface of the window will be completely degreased, which will prevent condensation from forming for some time.

Anti-fog saline solution

The saline solution is applied to a pre-washed window

1 You need to prepare the solution itself. To do this, take 4 liters of water and dissolve 1 tbsp in them. l.

2 Wash the glass in advance with a soap solution , and after it dries, apply the solution evenly.

If there is too much salt, white streaks will remain on the glass after drying. In this case, the entire procedure will have to be repeated from the very beginning.

Glycerin solution

It will be no less effective in case of fogging.

To do this you will need:

Alcohol and glycerin are mixed in a ratio of 10/1.
The solution is applied to a previously cleaned glass surface and left for some time. After some time, the alcohol will disappear, and the glycerin will remain on the surface of the glass as a protective film.

Potassium oil, glycerin and turpentine

First you need to prepare the solution itself.

To do this, mix:

40 g potassium oil
4 g pine turpentine
20 g glycerin

The mixture will be quite thick, but it must be applied to pre-washed glass using a sponge. Apply the product in an even layer, distributing it over the entire surface. Using a woolen cloth, polish the glass until it shines.

Method with newspaper

Cleaning a window with newspaper

Many generations before us used crumpled newspapers to clean windows. They help to completely clean the glass surface from dirt and soap stains.

At the same time, few people know about the “miraculous” property of printing ink, which gives the treated glass a water-repellent effect:

wash windows with soapy water
start polishing them with crumpled newspaper

Chalk

Chalk solution (you can use tooth powder, it must be white), dilute it with water and treat the pre-washed window. After treating the surface, it must be washed to prevent streaks from appearing.

Step-by-step instructions for installing a window valve

If the window frame is not equipped with a supply valve, you can install it yourself . To do this you will need (depending on the valve design):

Electric drill and drills 5-10 mm .
Jigsaw.
File.
Shoe knife.
Sealant.
The valve itself.

In addition, you will need a template for marking the frame crossbar .

Procedure:

Step 1. Prepare the necessary tools, as well as components for the valve itself.

Simple valve assembly

Step 2. Attaching the template to the crossbar, draw the outline of the hole for the supply valve.

We define the contour according to the template, in the center of the window

Step 3. Make through holes along the contour, which, using a jigsaw, are connected into a solid rectangular cutout.

Cut a through hole, strictly according to the template

Step 4. Use a file to straighten the edges of the hole.

If the jigsaw file is sharp, the edges will already be quite clean

Step 5: Install the valve mounting strip. It is attached with self-tapping screws to the overlap (quarter) of the window crossbar from the inside.

Installing the valve strip

Step 6. From the outside, install the outer part of the valve, equipped with a visor. Fastening with self-tapping screws and sealant.

The external visor is installed as sound insulation

Step 7. Secure and adjust the inside of the valve.

We complete the valve installation

You should work carefully and without haste, carefully monitoring the condition of the glass unit.

Anti-fog chemicals

Window cleaner “Sekunda”

Folk remedies do not always help as much as they should, and then you have to look for other ways to combat this problem. Modern household chemicals are another simple way to combat window fogging.

All chemicals that are designed to combat condensation work on the same principle. The composition is applied to the glass surface and left for a certain amount of time (which is indicated on the packaging; this period is different for all products). After this, wipe the window dry using a lint-free rag.

Tested chemicals:

1 "Li-lo." An effective remedy for fogging and freezing of windows. The product is very concentrated, so you must wear gloves when working. You can buy it at most hardware stores. Apply a thin layer of the product to the surface of the glass; for this you can use a dish sponge. After this, you need to treat the surface a second time with the already diluted product. We dilute “Li-lo” with water in a ratio of 10/1. Without washing off the previous layer, apply the diluted product and do not wash off. We are waiting for it to dry completely.

2 "Second". The product is sold in aerosol form, making it much easier to apply. It is evenly sprayed over the surface in several layers. After this, the glass must be thoroughly wiped with newspaper.

Is it possible to solve the problem of moisture?

The problem of fogging of translucent elements inside a double-glazed window can be solved by completely replacing the double-glazed window . To do this, a new window unit is ordered from the factory, which is installed in place of the dismantled element.

If there is no technical or material possibility of replacing an entire part of 2 or 3 glasses, it is possible to use more gentle methods related to sealing the glass unit around the perimeter or changing the temperature and humidity parameters in the room being used.

Important. Experts do not recommend resorting to simple solutions, since these measures are only temporary. After a certain period of time, the problem occurs again, which will ultimately require window replacement.

When is it impossible without radical methods?

In some cases, the problem cannot be solved by simple repairs , and the owner of the premises is forced to replace the entire double-glazed window or adjacent structural elements:

When a double-glazed window delaminates due to a violation of the adhesive bond between the profile and the translucent element along the perimeter.
In the case of ice formation between the glass panes with further expansion of the crystallized liquid medium, which causes deformation of the framing aluminum profile of the glass unit.
If there are cracks, chips and other defects on the surface of the glass as part of the window block.

Solving the problem without purchasing a new double-glazed window is impossible if there is a manufacturing defect associated with depressurization of the double-glazed window.

In such cases, if the window was installed relatively recently,
experts recommend contacting the manufacturer .
He is obliged to provide a free product with the same dimensions and thermal properties, even if the warranty period for the result of window installation has already expired.

As a rule, when selling double-glazed windows, each manufacturer guarantees at least 25–30 years of flawless operation of their products.

A little about window ventilation

The same comb on the window

As mentioned above, most often the most effective way to combat the formation of frost on glass is high-quality ventilation. The window structure must be equipped with ventilation.

Windows with a window. Today, windows with a window are extremely rare; they are made only according to the individual orders of the buyers themselves. But this design is most effective in combating condensation. The flow of cold air from the street is easily regulated; it penetrates into the room at the top of the room, where it combines with warm room air. This improves the microclimate in the room.
Micro-ventilation. It has already been mentioned before, now let’s look at this method of ventilation in more detail. This is the name of the ventilation mode, which is found in almost all modern window designs. The window opens just a little, leaving a small gap through which air exchanges. Through this gap, a lot of cold air will not be able to penetrate into the room, so ventilation in this mode will not bring discomfort to the inhabitants of the house, even in cold weather.
Self-ventilation. This function is initially present in all window designs. It consists of many small holes in the lower and upper frames of the window. Air circulation eliminates fogging, cold air enters in the lower part, and air leaves the room through holes in the upper frame.
Combs on the windows. A comb is an accessory for plastic windows that can be purchased at any specialized store. It helps regulate the intensity of ventilation and opening of the sash.
Ventilation duct. Many people neglect to install it right away, and install it only after a problem appears. Such a ventilation duct is installed either under the window sills or in the profile itself. The devices are completely different. The cost of such a channel is quite high, so ventilation installation should be done by a professional.

Other ways to eliminate condensation

Convection screens will help in the fight against condensation

But chemistry and folk remedies are not all that help cope with the problem of window fogging.

Of the other methods, the most effective are:

Using a fan, you can create air circulation in a room near a window. The device is placed on one of the window sills, and its direction should preferably touch several window sills at once.
Convection screens. This is a special device that directs a flow of warm air to the window and prevents condensation from forming. These screens need to be installed at an angle of 30-60 degrees. If the method turns out to be effective in your case, the device can be decorated in accordance with the overall interior of the room.
Electricity against dew on windows. This method is considered extraordinary, but in most cases effective. Foil, nichrome thread, or other material that conducts current is attached around the perimeter of the entire window. They operate at a voltage of 12-24 W. This solution warms the windows and prevents condensation from forming.

Fogging of glass on balconies and loggias

It is impossible to control the microclimate in unheated rooms, so slight fogging of glass on a veranda, balcony or loggia is normal. During the day, this area heats up from the sun's rays, and in the evening it cools sharply, which leads to moisture condensation. The problem is typical only for the cold season.

If the windows sweat a lot, most likely there is increased access of warm air into the unheated room, for example, the balcony door is often open. Condensation can be reduced only by regularly ventilating the balcony or loggia.