HCLHVAC Cost Lab

Calculators / Efficiency

Updated Jul 26, 2026 · Method and source links reviewed

Efficiency

SEER2 Savings Calculator

Model the direction and approximate scale of cooling savings from an efficiency upgrade using your current cooling use and electricity price.

Your planning inputsUpdates automatically
SEER equiv.
Use an estimated effective rating for the current system.
SEER2
Enter the proposed rating.
kWh
Estimate from interval data or a contractor model.
$/kWh
Use the variable all-in rate.
$
Difference between the two installed quotes.

Estimated result

$216/year

1,200 kWh modeled annual savings. Simple payback on the $2,500 premium: 11.6 years.

How to use this estimate

  • Compare the efficiency premium—not the full system price—to the modeled savings.
  • Comfort, sound, humidity control, and incentives can matter even when simple payback is long.
  • Degraded ducts or incorrect airflow can erase expected savings.

Transparent method

We expose the planning formula so you can challenge it and replace assumptions with local evidence.

new cooling kWh = current kWh × current efficiency ÷ new efficiency

What this calculator cannot see

  • SEER and SEER2 are different test procedures; this simplified comparison treats the entered ratings as relative seasonal efficiency indices.
  • Weather and thermostat behavior vary year to year.

Professional verification

Use this result to prepare questions and compare scenarios. Final equipment selection, electrical work, refrigerant work, combustion, duct design, and permitting should be handled by qualified professionals following local codes and manufacturer instructions.