HVAC & Air Conditioning Calculators

AC BTU sizing, whole-house tonnage, heat pump size, running cost, ventilation air changes and water heater size.

BTU/hAC BTU Calculator: What Size Air Conditioner Do I Need?BTU for a room from square feet, sun, people and kitchen.tonsAC Tonnage Calculator: What Size AC for My House?Central AC tons from square feet and climate zone.BTU/hHeat Pump Size Calculator (Heating Load in BTU)Heating BTU and heat pump tons for your house.$ per monthAC Running Cost Calculator: How Much Does AC Cost per Month?kWh and dollars per month from BTU and SEER2.CFMAir Changes per Hour Calculator (ACH to CFM)ACH ↔ CFM ↔ m³/h for any room and fan.gal · GPMWater Heater Size Calculator (Tank Gallons or Tankless GPM)Tank gallons or tankless GPM for your household.