Timer based blower on and off time of 75 seconds, not based on temperature. I might be able to modify it electrically which might require swapping a resistor somewhere or something. Either that or maybe setup some kind of relay to hold it on for a certain additional time period after the power is normally cut off. ..I suppose a 90 degree fan switch might not be a bad idea, that would turn it on sooner too and shut off once it drops below 80 degrees to really get the heat out of the ductwork.
After 10 minutes of gas run, it will usually be at 140 degrees(70 degree temp rise). It varies a bit depending on filter age, if any dampers or registers are closed, and fan speed. I have a roommate right now who prefers a warmer temperature than I do so some of the dampers and registers are shut to position the heat where the cold-baby is.
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