Size HVAC Equipment
These calculators turn a building’s size and conditions into the capacity of equipment to buy or check: BTU/h and tons for air conditioners and mini splits, furnace, boiler and heat pump size, radiator heat output and chiller tonnage. The SEER savings calculator compares an old and a new air conditioner or heat pump on yearly electricity and money. The BTU to kW converter moves a result between BTU/h, kW, watts, tons and horsepower.
Tools in this group
- AC Size Calculator (BTU and Tonnage) — Enter the floor area and a few conditions to get the cooling capacity in BTU/h and tons, and the nominal AC size.
- Boiler Size Calculator — Size a boiler for space heating, a combi boiler for hot-water flow, or a system boiler for cylinder reheat.
- BTU to kW Conversion Calculator — Type a value in BTU/h, kW, tons or watts to see it in every other unit, with the conversion factor.
- Chiller Tonnage Calculator — Enter the chilled-water flow and temperatures, or a process load, to get the chiller size in tons, BTU/h and kW.
- Furnace Size Calculator — Enter your home's size, insulation and winter design temperature to get the heat loss and the furnace size in BTU/h.
- Heat Pump Size Calculator — Enter your home's size, insulation and winter design temperature to get the heat pump size in tons, with the cold-weather capacity loss taken into account.
- Mini Split BTU Calculator — Enter each room you want to cool to get its BTU, the head size for each zone and the outdoor unit size.
- Radiator BTU Calculator — Enter the room size, walls and windows to get the heat output a radiator must give, in BTU/h and watts, corrected for your water temperature.
- SEER Savings Calculator — Enter the size and the old and new SEER or SEER2 ratings to see the electricity and money saved on cooling each year.