this post was submitted on 21 Jun 2023
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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 21.5C@57.1%. Bed room 1 is 18.1c@67.6, bed room 2 is 17.8@70.4%, bed room 3 is 19.1c@65.3% 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 14.6c@77.7; which is not insulated & not heated.
Think as a gap stop I'll get a dehumidifier, especially for the colder winter months.
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.
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.
But perhaps worth giving it a try for an hour or so.
A dehumidifier will actually add a bit of heat.