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We've got an insulated house, heat it properly, ventilate it, but still see humidity levels of 70%+ in bed rooms. How to fix that? (lemmy.nz)

submitted 1 year ago by [email protected] to c/[email protected]

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We built a house 7 years ago and it's insulated and has double glazing. I've installed Home Assistant with temp sensors in the bed rooms and seeing 70%+ humidity levels. Temperature is always above 16c

We ventilate it, but still it's 70% in the bedrooms. WHO recommends 40-60%, so we're a bit worried.

Living room is around 55% during the day when we have the heat pump set at 21c.

As it's pretty humid outside I think it's almost impossible to get it lower, but are there any other tips? I don't want to run dehumidifiers. Would an HRV like system help?

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[–] [email protected] 4 points 1 year ago (57 children)

Thanks Dave, much appreciated! Yes, I guess it's from internal sources, like shower, drying clothes and cooking. Will try to decrease that, but as you said, drying clothes outside is not really an option in winter.

So, right now, living room is [email protected]%. Bed room 1 is [email protected], bed room 2 is [email protected]%, bed room 3 is [email protected]% We've got doors open so it should stabilize a bit more. I understand that higher temps means lower RH, but I don't want to heat bed rooms to 21c. There are panel heaters in each bed room, which are set at 16c during the night, and at 19c at the end of afternoon until 6pm.

Garage is [email protected]; which is not insulated & not heated.

Think as a gap stop I'll get a dehumidifier, especially for the colder winter months.

[–] [email protected] 5 points 1 year ago (55 children)

Other than the garage, those temperatures/humidities all have a similar amount of moisture in the air, the difference comes from the temperature of the room. See this calculator I googled up: https://www.omnicalculator.com/physics/absolute-humidity

So the warm air has X amount of water in it, and when it goes to the cold room it still has the same amount of water, but because cold air can hold less water the relative humidity goes up. So I don't think there's anything special about the bedrooms.

The dehumidifier is probably a good idea, but before you go and buy one, check if your heat pump has a "dry" setting.

[–] [email protected] 4 points 1 year ago (52 children)

Thanks Dave again for the insights!

Our heat pump has a dry setting, but it must be set 2c lower than ambient temperature. So it's getting quite cold. I was hoping / assuming that a dehumidifier wouldn't cool that much.