View attachment 196034
Old junk BDP(carrier) from 1992.
This system is still a basket case even after replacing it, that’s beyond my scope though.
Cape cod style house, at some point some moron moved the furnace to the second floor and jammed it into this closet. Ducting is basically non existent in the house. 100k single stage furnace which is enough for an average built 3000sqft house. This place is about 1000sqft.
Put in an 80k two stage and programmed the stat to keep the second stage from firing unless there’s a 3 degree difference between set point and room temp. Should never have a problem keeping up even in low stage (42k output)