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Guide · 5 min read

SEER Ratings Explained

What SEER means, why it matters, and how much energy a higher rating saves.

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SEER Efficiency Calculator

Energy-use comparison · current SEER2 standard
10
18
3 tons
~44% less energy
Estimated cooling energy use vs. your current system · about 2,240 kWh/year less

Estimate only — an energy comparison from typical cooling hours and current SEER2 efficiency ratings, not a dollar figure. Actual energy use varies with your home, usage, and weather. Call a pro for a tailored recommendation.

Open the full SEER Efficiency Calculator

SEER stands for Seasonal Energy Efficiency Ratio — a measure of how much cooling a system delivers per unit of electricity over a season. The current standard, SEER2, is tested under tougher real-world conditions, so a SEER2 number is a more honest gauge of efficiency.

Why efficiency matters

The higher the SEER2, the less electricity your system uses to keep you comfortable. Upgrading from an older, low-efficiency unit to a modern high-SEER2 system can meaningfully cut summer cooling energy use — especially in a long, hot cooling season like South Carolina's.

Quick context: jumping from a 10-SEER system to an 18-SEER2 system can cut cooling energy use by roughly 40% — your actual reduction depends on your home and how you use it.

Compare efficiency

Use the calculator at the top of this page, then call a pro for a tailored recommendation.

What affects the result

  • How many hours you run cooling each season
  • System size (tonnage) and how well your home is sealed
  • Thermostat habits and maintenance
  • The efficiency gap between your old and new system

Because these vary home to home, treat the figure above as a planning estimate, not a guarantee.

Next steps

A higher-SEER2 system uses less energy to keep you comfortable. A local pro can weigh the options for your home and recommend the right efficiency level. It's free to call.

Talk it through with a local pro

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