Heating & Cooling calculators
2 free toolsSize air conditioners, heaters and water heaters correctly: room AC BTU, tankless and tank water heater sizing and more, using U.S. Department of Energy and ENERGY STAR guidance.
AC Size CalculatorEnter your room size to find the cooling capacity you need in BTU per hour, using the ENERGY STAR room air conditioner chart. The calculatorHeating & CoolingWater Heater Size CalculatorFind the right water heater for your home. For tankless models, add up the fixtures that run at the same time and your temperature rise to gHeating & Cooling