ON TOPIC: Fan only furnace operation

Well, wouldn't you know it. I just replaced a theromstat on my heat pump. The wiring did not exectally match up old to new. I think I have it correct as the cooling part is working. Won't know for about 3 or 4 months if the heat part works.

I could have used the explination of the letters about 8 hours ago..

I did think to take a pix of the old one and labled the wires with the old letters.

I copied that web page and will file it with the other heat pump info.

In my first house - a small bungalow - I would block the two main floor air-returns < just lie magazines over them > and open the furnace filter access door - place a spare filter across the door opening - and run the fan - drawing cooler basement air through the spare filter rather than the main floor returns - and circulating it .. not like having air conditioning - but it helped for the muggy days in July-August .. John T.

I did that when I was a kid, but I recall adding a switch to the furnace in the basement. I loved that basement.

If this doesn't deliver the environmental improvement you are looking for; a great alternative would be a whole house fan.

On Thu 27 Jul 2017 03:38:52p, Taxed and Spent told us...

Kids usually do. I loved our basement too.

Whole house fan might be an alternative, depending on the climate. If the furnace doesn't support a fan wire, I wouldn't waste much time trying to rig up something for the furnace. Just moving air around inside the house isn't going to do much. I have used it to drop the temp in a house without AC temporarily by running the fan on a furnace in the basement with the blower door off and the door to the basement open. It pumps the cool basement air upstairs and there is a nice effect, but the biggest effect doesn't last, once the air has exchanged about one.