Question:

we built our house too air tight and now have problems with moisture condensation on walls where they connect to the ceiling. I have been told that the best solution would be to have a dehumidifier. I would like prices for installing one in the celing where the bathroom fan is currently

Answer:

I don't know where you live so I cannot get involved in pricing but your problems I think would be better addressed with an air exchanger and a non-condensing dehumidifier that you build yourself: As air cools, it falls and keeps falling until it reaches the lowest level in the house. It cannot fall beyond the basement floor and that is where it has to be collected and pumped outside before that moisture gets a chance to condense in order to get rid of the moldy, musty odour and/or avoid it in the first place. A booster fan (250 CFM +) is available as a ‘pop in’ unit to fit 4”, 5” or 6” round heating duct. This can be installed in a totally separate duct line that is at least six feet from the nearest heat source. A timer on it will ensure that it operates only during the night (9pm to 9am) so cold, moist air it pumps out is not replaced by air that brings in even more humidity from outside. All joints and seams in the duct are taped and sealed for maximum efficiency and rather than a heating-type grill it should be a return air-type grill. To avoid having to core another hole in the foundation wall, this system can be vented, via a “TY” through the clothes dryer vent. Because none of the doors in the house go all the way to the floor, cold, moist air should find its way to that grill.

Answered By: Ren Molnar

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