So after posting earlier about our house being warm without the heating being on, I looked through the manual that we were given when we moved in and it turns out we have a heat recovery unit on the attic called an MVHR. Anyone know anything about them?
It seems they filter the incoming air and also heat it before circulating it around the house? We have 2 zones in the house that have temp controls, upstairs and downstairs and I thought they were set to the central heating (if I set the dial to 21° upstairs, the radiators upstairs come on and heat it up to 21°) but could the MVHR also be controlling the temp too?