HVAC calculators

Estimators built on published cost and efficiency data rather than rules of thumb. Each shows its assumptions and confidence labels — because a range with visible reasoning beats a confident guess.

• Repair vs replace →

  The 2026 decision tool — priced with current R-410A recharge reality, not 2023 numbers.

• AC replacement cost →

  Tonnage × SEER2 tier × your state’s labor costs. Transparent assumptions.

• Operating cost →

  Annual cooling cost from your state’s real EIA electricity rate and NOAA cooling load. All 50 states.

In production

Each ships once its inputs and formulas are sourced — not before.

• System sizing (tonnage)

  Planning ranges plus why Manual J is what actually sizes a system.

• Efficiency upgrade payback

  What a higher SEER2 tier returns, and when.

• Heat pump vs furnace

  Fuel-cost comparison using state electricity and gas rates.

• Ductwork cost

  Replacement and sealing, by linear foot.

• Permit cost by county

  Built on our verified county fee dataset.