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What is the ideal humidity level in a house?

What is the ideal humidity level in a house?



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Why care about the relative humidity in a house?

In a house, the percentage of water vapor contained in the air compared to the maximum amount that it can absorb is called relative humidity (or hygrometry).
In a home, this rate is obviously bound to vary according to various parameters, such as for example:

  • Outdoor temperature and season;
  • The number of inhabitants in the house (a family of 4 naturally gives off more than 10 liters of water vapor per day);
  • The type of heating chosen;
  • Indoor activities…

It is very important to know the humidity in a house in order to see if it is not too low or too high, and, if necessary, to regulate it. Simply because to live properly in a house and be healthy, humans, animals and plants also need a certain amount of water vapor in the air!
 

The ideal humidity level in a house

In France (the optimal humidity level in a home varies according to the climate and therefore geographic areas), the ideal humidity according to doctors is between 40 and 60% - and rather between 45 and 55% for people with fragile health. Generally, a humidity rate between 45-65% is perfectly acceptable.
 

How to measure the humidity in a house?

For measure the humidity and the temperature of your home, there is a very simple but very effective device: the hygrometer. Equipped with a probe and a needle (older models) or a digital dial (newer models and more practical to use!), The hygrometer measures and analyzes in just a few minutes the quality of the ambient air in a house.

Be careful though : Although easy to use and fairly precise, the hygrometer is not a 100% reliable tool for measuring the humidity level in a house. If you have any doubts or want to measure the humidity level at home very precisely and accurately, call a professional!
 

Humidity level in a house too high or too low: what are the risks?

If it is important to know the ideal humidity level in a house and to know measure the humidity of a homeis that too high or too low humidity can have harmful consequences in a house, both in terms of its structure itself, but also for its occupants.

Indeed, thumidity too high (greater than 65%) in a house can result in:

  • The proliferation of microbes and microorganisms that can cause allergies or infections (such as mites for example).
  • The development of fungi and / or mold on the walls and ceilings of the house with a musty smell that remains constantly.
  • The appearance of condensation on all cold surfaces of the house.
  • Peeling off the wallpaper or deterioration of the paint on the walls (blistering, cracking).
  • Laundry that smells bad because it does not dry properly.

But one relative humidity too low in a house (below 30%, which often happens in winter when the heating is always on) is also not good sanitary speaking, because too dry ambient air can have the consequences:

  • An increase in lung, eye irritations, allergies and asthma because viruses spread faster when the air is dry.
  • Dehydration problems.
  • Fatigue and headache.
  • Chapped lips and nasal congestion.

How to regulate the humidity level in a house?

To avoid ending up with too low or too high a humidity level at home (with the consequences that this can cause), remember that:

  • You can fight against a high humidity level by ventilating and ventilating your interior correctly, by insulating it correctly, and if necessary by investing in a dehumidifier to dry the ambient air.
  • Too low a humidity level can be remedied with an electric humidifier.