How many sq ft a 3 ton heat pump will cool depends on climate, insulation, and Manual J load calculation, but rule of thumb is 3 ton or 36,000 BTU can cool 1,500 to 2,000 sq ft in moderate climate, and 1,200 to 1,500 sq ft in very hot climate. BTU coverage calculation uses cooling load: in moderate climate like Pennsylvania requiring 20 to 25 BTU per sq ft, 3 ton at 36,000 BTU covers 1,440 to 1,800 sq ft. In hot climate like Texas requiring 25 to 35 BTU per sq ft, 3 ton covers 1,000 to 1,440 sq ft. For well-insulated new home built after 2010 with R-49 attic and R-20 walls, coverage is higher at 1,800 to 2,200 sq ft for 3 ton. For poorly insulated old home built before 1970 with single pane windows, coverage is lower at 1,000 to 1,300 sq ft. 3 ton is common size for 1,600 sq ft homes. Oversizing heat pump causes short cycling, poor humidity control at 60 to 70 percent humidity, and higher bills. Undersizing causes not reaching set temperature on hottest days at 95 degrees outdoor, staying at 78 to 80 degrees indoors. Proper way is to have contractor perform Manual J load calculation that considers insulation, windows, air leakage, and climate, not just sq ft, to size heat pump exactly. For 2000 sq ft average home, 3.5 to 4-ton heat pump is typically needed, not 3-ton.
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