I've been considering adding an energy recovering ventilator to my old
house; since we spent so much time and effort leakproofing it, the air
is now often stale, and the fireplace won't draw.
I did a search, and there are many companies making them, but of course
they all claim to be the best, and I don't know enough about them to
evaluate them, much less to decipher which ones will last longer and be
easier to maintain.
Please post any advice on the benefits/detriments of these, what I
should look out for, and which manufacturers offer the best reasonably
Our house is about 900 square feet per floor, with heating/AC
ventilation to the basement, first floor, second floor, and (marginally)
The only way to know if you need one or will benefit is get a blower
door test, it measures air exchanges per hour, as JM said old homes are
hard to seal. If your house is tight you need it sized right.