in my 2 bed ground floor maisonette there are 2 heat recovery ventilators fitted. they are made by kair. they are rather unsightly with 2 boxes each at the top of the walls in the lounge and main bedroom with a boost cord hanging down. also there is the trunking for the power cables going up the wall.
my question is, does anybody have experience with these or similar units. to be honest they don't seem to make any difference whether on or off. the maisonette has had problems with damp (i'm pretty sure its cold wall condensation and nothing more).
also one of them stays permanently in boost mode which is quite loud, the humidity sensor doesn't seem to work. its definitely not manually set to boost.
i get the feeling the previous owner called in a specialist company and had a salesman call in and sell these units without properly checking the cause of the damp/mould on walls.
any views welcome as i'm pretty inexperienced with diy!