5 ms·
In addition to other replies you want to keep the relative humidity <60% otherwise you get condensation (your 20C air, 40% relative humidity gets cooled to 15C
by yread 4y ago
In addition to other replies you want to keep the relative humidity <60% otherwise you get condensation (your 20C air, 40% relative humidity gets cooled to 15C and that becomes 55% relative humidity, cool it to 10C and it becomes 75%). Condensation can cause mold, short circuits and all kinds of other expensive problems.
- inglor_cz 4y agoGetting humidity under 50 per cent in a freshly built house over the winter ... turned out just impossible. We fought hard to keep it at least under 60 per cent, as you say. If it froze outside, windows in the bedroom would be covered with water droplets in the morning. (Actually, it froze last night, quite late in the season, and the windows were wet again.)
- bornfreddy 4y agoKeeping humidity low is all about making sure the air doesn't cool too much, or if it does, replacing it with drier (colder) air from outside. There is a certain amount of water in air and when it cools this water will condense. Good insulation (keeping inner temp constant) is key.
- adrianN 4y agoYou might want to look into installing heat-exchanging ventilation.
- yread 4y agoYeah it's a bit counter productive - you build a house with great insulation so that there is almost no heat escaping outside. And then you have to install ventilation that literally creates vacuum in your house to suck cold dry (absolutely speaking) air in to keep the humidity in check. And then you sit in the living room wondering why is there such a draft. At least new houses are built with heat recovery to solve this