I have a 3 year old Trane Furnace TUD1A040A9241AB with a 2 ton Cooling evaporator 4TXCA024BCHCBA. I believe it is a single speed blower or if not, I would like to figure out how to limit/eliminate the highest speed. It is noisy! Have to constantly change the TV volume based on if it is running or not and now with COVID19 and wife working from home, she can't hear on conference calls when it is running.
I heard there are aftermarket kits that can vary the speed (with some type of rheostat?) that have two thermistors both upstream and downstream of the blower. Mainly need to solve this issue with AC mode as we live in a condo in Florida and rarely even need to use the gas furnace as our elderly neighbors seem to keep their condo's so warm that our condo never gets cold in the winter.