Removing window fog and condensation at home: 6 effective tips

Damp problems are not uncommon in a home, especially in winter. What are the causes of condensation in a house, how to get rid of it and how to remove fog on the windows? Explanations and advice.

Written by Cecileon Nov 22, 2022, at 2:55 p.m.

Why is there fog inside a house?

In a dwelling, humidity can be caused by several factors : possible infiltrations, rising water by capillarity of the ground via the walls, or even human activities (cooking with water, showers, breathing, perspiration, etc.).

These condensation problemswhich can occur in both new and old housing (except for concerns about capillary rising damp, which is more common in old homes), are due to increased humidity in a room (humidity level). Result: condensation is created, a natural phenomenon that occurs more frequently when the outside air is cold. Why ? Because this air then cools the walls and windows, on the other side of which is the hot air contained inside the housing.

The formation of liquid condensation, which occurs when the water vapor contained in the air comes into contact with a colder surface, is all the more likely when:

  • The room is poorly ventilated,
  • badly heated
  • or insufficiently insulated.

Although unpleasant, condensation is not necessarily a problem, except when the walls are constantly damp to the touch, or when the windows are fogged up in the early morning. These are, among others, signs of too much humidity, which can cause structural and material damage in a home. Possible health problems may also arise among the occupants. Simple gestures can reduce condensation at home. But beware, they do not solve the cause.

How to remove condensation in a room?

If there is too much condensation in a home, these simple actions can alleviate it, but you will need to call in a professional to definitively resolve the cause or causes. Nevertheless, in the event of non-problematic condensation, these good habits will help you get rid of it:

Ventilate the room

Ventilation is essential to reduce natural condensation. Ventilate your home at least 30 minutes a day will allow the air to be renewed in order to evacuate the humidity. Less humid air will also be easier to heat, which will somewhat reduce your energy consumption related to heating. Even if outside, the weather does not make you want to open your windows wide, this gesture is essential. You can split the recommended airing time, by airing your home for 15 minutes twice a day. Just remember to turn off your radiators before opening your windows.

In addition, your home must have ventilation at each window and ideally in all rooms. Installing a VMC is thus recommended to renew the air within a dwelling and thus regulate the humidity level.

Read also – Heating: this essential gesture for a properly heated home

Heat to the right temperature

Heating is also important in case of problematic condensation. A temperature of around 19 to 20°C is recommended in winter, no more no less. This temperature saves energy while enjoying a comfortable atmosphere. Heating more will not regulate the humidity of a room, not to mention the financial cost that this will entail. It should also be noted that in the bedrooms, this temperature can be lowered to 18 degrees, or even 17 degrees, or increased to 21°C in the living rooms such as the living room.

The idea being to adapt the temperature of his home according to his habits, taking care, however, that the temperature does not drop excessively, which would accentuate the humidity of the ambient air. Thus, in the event of prolonged absence, do not completely cut off your radiators.

Fight against humidity in a room

Read also : Do not exceed this precise temperature to avoid salty bills

Insulate properly

Another point not to be overlooked in the event of problematic condensation: room insulation concerned. This indeed plays a major role in the fight against humidity as well as heat loss. In the event of absent or ineffective insulation, heating and ventilation will have little effect on reducing condensation.

Several insulation work should be undertaken, starting with installation of double glazed windows. But also: the insulation of walls, floors, lost attics. Financial aid is available with MaPrimeRenoveven for tenants who wish to carry out energy-saving work.

Read also : 5 ways to improve your insulation without doing major work

Absorb moisture naturally with natural solutions

Finally, several natural solutions can be used to fight against humidity at home:

  • Putting several pieces of charcoal in a waterproof box with several holes can act as a dehumidifier. Depending on the humidity in the room, the charcoal will need to be changed approximately every 15 days.
  • The same solution to naturally dehumidify a room can be made with coarse salt, or even quicklime.

Some plants also have the ability to regulate the humidity of a room.

Read about it: 10 plants to get rid of humidity in the house

Limit the formation of vapor

Finally, to reduce the humidity of a dwelling, it is also necessary avoid or reduce water vapor-creating activities. When cooking, remember to cover your pots with boiling water and open the kitchen window when possible. Avoid showers that are too hot and too long, as well as hot baths. Dry your wet laundry outside your home.

Get rid of fog on the windows

How to stop having fog on the windows?

By reducing the humidity in a home, the advice given above generally helps to get rid of fog on the windows. However, if condensation forms daily on your windows, it may mean that they are not performing well enough. Indeed, the more the windows insulate against the cold, the warmer their interior glazed surface will be and therefore the less likely to create fog.

If your windows are single-glazed, condensation on the panes is difficult to avoid when outside temperatures drop. If your home is already equipped with double-glazed openings, it may have lost its insulating power. This may be due to the seals around the windows. Do not hesitate to pass the finger on the edge of the windows concerned. If you feel breaks on the seals or in the frame, these defective seals must be replaced.

anti-fog tip : to avoid the formation of fog on the windows, especially those of the passenger compartment of a car, anti-fog sprays exist. However, it is possible to do without it by simply using soap.

  • Place a thin soapy layer on the interior glass by slightly moistening one side with soap.
  • Clean the traces created with a simple slightly damp cloth.

A trick that also works by depositing not a thin layer of soap on the interior windows, but a light layer of dishwashing product, also to be wiped with a damp cloth.

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Removing window fog and condensation at home: 6 effective tips