Quote:
Originally Posted by cabmando
If you have a digital thermometer, place one in the main duct after the first heat run. Then place in the return air duct at the furnace. Check your temperature difference and report back.
Make sure you watch a complete cycle by the way. If you're not holding temp you could be cycling off of limit.
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Do this first!
He is asking what the difference in temperature is across your furnace.
Normally you should see about a 40-50 degree temperature rise across the furnace.
It doesn't take very much very cold fresh air entering the furnace return air duct to drive supply temperature down. You may have to throttle the amount of fresh air entering for colder weather.