Radiant, Boiler or Mini-Split system(s) with no hot air ducts/vents
Heat Pump with no auxiliary/back up heat
Heat pump with gas or electric auxiliary/back up heat
Gas or Electric forced air furnace, horizontal installation in unconditioned attic or crawl space
Gas or Electric forced air furnace, horizontal installation in conditioned attic or crawl space
Gas or Electric forced air furnace, upflow installation in closet or basement
Gas or Electric forced air furnace, downflow installation in closet or basement