Quote:
Originally Posted by PaperBagger'14
It’s used to exhaust air out of your house. This switch will usually operate both your furnace “intake” fan and a bathroom exhaust fan allowing you to exchange air in your home. Because homes are sealed very well there is a need for the furnace to bring fresh air in meanwhile exhausting hot air out.
This can be used as a poor man’s AC when the inside of your house is very hot but the ambient temperature is significantly cooler.
Most of the time that switch never gets used.
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I had a townhouse like that. There was a switch on the main floor in parallel to the one in the basement so they wouldn't have to run as far. The building developer said that the fan was so much more important during the building of the property due to how sealed modern homes are, but is a bit less important after the build is done, especially if AC is added later on etc.
He said since it's no issue to just leave behind, no point spending the time/cost/effort to remove after the buyer moves in.
As for being poor man's AC, I dunno about that. If your unit is not great for catching the breeze and in the sunlight, in my experience it won't help much. Venting excess moisture, that's a maybe? It wasn't remotely close to being on par with the cool to dry function on the AC unit in dropping humidity.