SEER, HSPF, COP, heat pump, and HVAC sizing calculators. Browse our free hvac tools below — all calculators are instant, accurate, and require no sign-up.
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.
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.
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 with this free calculator.
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.
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.