HVAC Calculators

Calculate heating and cooling loads, BTU requirements, and energy costs.

Calculate heating and cooling BTU requirements for any room. Accounts for room size, insulation, windows, and climate zone.

Estimate HVAC installation and replacement costs. Compare furnace, AC, and heat pump prices by size and efficiency.

Estimate the right AC tonnage for your home based on square footage, climate, and insulation.

Size a furnace by BTU output based on home size, climate zone, and heating degree days.

Estimate duct size, airflow (CFM), and number of supply and return runs for your HVAC system.

Calculate room-by-room CFM and air changes per hour (ACH) to balance supply and return airflow.