What size house can a heat pump with a 3.5 ton compress heat and cool?

You should have an HVAC company perform a Manual J load calculation done on your home.

for the best sizing . The old way here in the south USA dictates 3.5 tons cooling served most homes from 1500-1700 sq ft. depending on variables. BE CERTAIN get the Manual J calc. for best results. Tom H. ,HVAC professional, New Orleans.