[Servicetech]

Installing a SMALLER FURNACE solves a lot of this. Cut the furnace size in 1/2 and run time each cycle triples. The time in between cycles doubles. Instead of running (4) 3minute cycles per hour, you run (2) 9 minute cylces. 12 minutes per hour @ 100K vs. 18 minutes @ 50k.

I found this when I changed my own furnace from 88k to 44k (yeah it was THAT oversized). The furnace actually runs long enough to get to to the full 45f rise instead of cycling off before reaching steady state. My funace runs 45 seconds before the blower kicks on, blower runs 3 minutes after burners switch off. There is about a 10f rise once blower kicks off. Even though the furnace cycles HALF as much thereis LESS overshoot/droop compared to the old furnace. Old furnace would overshoot 2-3 degrees, new only 1 degree.