HVAC Tools & Calculators
Free calculators to help you plan an HVAC project before you call a contractor. Every tool gives a quick estimate — use it to size equipment, gauge running costs and understand savings, then get local quotes to confirm.
AC & Furnace Sizing Calculator
Free AC and furnace sizing calculator. Estimate the BTU and tonnage your home needs by size, climate, ceiling height and sun exposure.
Open toolWater Heater Size Calculator
Find the right water heater size for your home. Estimate tank gallons or tankless GPM based on household size and bathrooms.
Open toolHVAC Energy Cost Calculator
Estimate what it costs to run your AC or heat pump. Calculate monthly and yearly energy cost from system size, runtime and your state electricity rate.
Open toolSmart Thermostat Savings Calculator
Estimate how much a smart or programmable thermostat could save on your heating and cooling bills each year.
Open toolWater Softener Sizing Calculator
Find the right water softener grain capacity for your home based on household size and water hardness.
Open toolAir Purifier Room Size Calculator
Find the air purifier CADR rating you need for a room. Size by square footage for effective indoor air quality.
Open toolCommercial HVAC Tonnage Calculator
Estimate rooftop / commercial HVAC tonnage for your building by square footage and occupancy type.
Open toolAir Duct Cleaning Cost Estimator
Estimate air duct cleaning cost by home size and number of vents. See a typical price range before you book.
Open toolNo Heat / No Cool Troubleshooter
Quick checklist for a no-heat or no-cool HVAC emergency. Run these safe checks before you call an emergency HVAC pro.
Open toolAll tools provide rough estimates for general information only and are not professional advice or a quote. Always confirm with a licensed HVAC professional. See our Terms of Service.