Understanding SEER Ratings: A Practical Guide

Shopping for air conditioning brings you face to face with SEER ratings. Understanding what these numbers mean helps you make smart choices.

SEER Defined

SEER means Seasonal Energy Efficiency Ratio. It measures cooling output against electrical input across a typical season. Higher numbers equal better efficiency.

Current Requirements

Federal minimums for our Southwest region require SEER 15 for new split system installations. Equipment ranges up to SEER 26 or beyond.

What Numbers Mean Practically

Comparing a 10 SEER old system to a 20 SEER new one: cooling energy use drops roughly in half. Valley savings depend on how much you run AC—which is a lot.

Cost Versus Savings

Higher SEER costs more upfront. A SEER 20 unit might run $2,500 more than SEER 15. Whether that pays off depends on:

• How many hours you cool
• Local electricity rates
• How long you'll keep the system
• Available rebates

Valley Calculation Example

Our long cooling seasons favor higher efficiency:

**Assumptions:** - 2,000 hours cooling annually - $0.22 per kWh - 3-ton system

**SEER 15**: 2,000 × 36,000 ÷ 15 ÷ 1,000 × $0.22 = $1,056/year **SEER 20**: 2,000 × 36,000 ÷ 20 ÷ 1,000 × $0.22 = $792/year

Annual difference: $264 Ten-year savings: $2,640

Beyond the Rating

SEER measures lab conditions. Real performance also depends on:

• Correct sizing
• Quality installation
• Ductwork condition
• Maintenance frequency

A high-SEER system poorly installed might perform worse than a moderate one done right.

Our Suggestion

For valley homes, SEER 16-18 typically balances cost and efficiency well. Higher ratings suit those prioritizing maximum efficiency or environmental concerns.

We'll calculate savings for your specific situation and recommend what makes economic sense.