BTU Requirement Calculator
Calculate the BTU heating or cooling requirement for a room. Estimate the energy needed to heat or cool a space based on volume and temperature change.
Free HVAC Calculators
11 toolsSEER, HSPF, COP, heat pump, and HVAC sizing calculators. Browse our free hvac tools below — no sign-up required.
Duct Insulation Savings Calculator
Calculate energy savings from insulating HVAC ductwork. Estimate annual savings from adding insulation to ducts in unconditioned spaces.
Duct Sealing Savings Calculator
Calculate energy savings from sealing leaky ductwork. Estimate annual cost reduction and payback from duct sealing with this free HVAC calculator.
Ductless Mini-Split Sizing Calculator
Calculate the right BTU size for a ductless mini-split system. Determine mini-split capacity based on room size, climate, and insulation level.
Furnace AFUE Savings Calculator
Calculate annual savings from upgrading to a higher AFUE furnace. Compare fuel costs between old and new furnace efficiency ratings.
Heat Pump COP Calculator
Calculate the Coefficient of Performance (COP) for your heat pump. Determine heating efficiency by comparing heat output to electrical input.
Heat Pump vs Furnace Cost Calculator
Compare annual heating costs of a heat pump vs gas furnace. Calculate which heating system is cheaper for your home and climate.
HVAC EER Calculator
Calculate the Energy Efficiency Ratio (EER) of your air conditioner or heat pump. Convert between EER and SEER ratings.
HVAC HSPF Savings Calculator
Calculate heating savings from upgrading to a higher HSPF heat pump. Compare annual heating costs between old and new heat pump HSPF ratings.
HVAC SEER Savings Calculator
Calculate annual savings from upgrading to a higher SEER air conditioner. Compare energy costs between old and new AC SEER ratings.
HVAC Sizing Calculator (Manual J Estimate)
Estimate the correct HVAC system size for your home using simplified Manual J principles. Calculate heating and cooling BTU requirements.