On Mon, 18 Feb 2008 19:03:00 -0600, CJT wrote:

mr. spam wrote:

I want to replace the fan motor with a 2 speed one

i want to add a switch to the furnace so i can have the fan on all the
time in slow speed. then when the burner or the ac comes on it will
change to high speed.

I think many (most? all?) furnace/AC combinations already incorporate
dual speed fans. Are you sure it doesn't already have the capability
you seek? You might just need an appropriate thermostat.

I believe you are correct. The heat uses the low speed and the AC the high
one.

Don www.donwiss.com (e-mail link at home page bottom).