HVAC Calculators

AC tonnage and furnace BTU sizing calculators for US residential HVAC.Explore HVAC sizing calculators for US residential construction, including AC tonnage and furnace BTU output/input estimates by square footage and climate zone. These tools help homeowners and contractors get a planning-stage sizing estimate before requesting a full Manual J load calculation.

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AC & Furnace Size Calculator

Estimate central air conditioner tonnage and furnace BTU output/input from your square footage, climate zone, insulation, ceiling height, sun exposure, and occupancy

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