SEER Ratings Explained: What the Numbers Mean

SEER ratings are key to understanding air conditioner efficiency. Here is what you need to know.

What Is SEER?

SEER stands for Seasonal Energy Efficiency Ratio. It measures cooling output divided by energy input over a typical cooling season.

Simple Explanation Higher SEER = More efficient = Lower operating costs

Current SEER Standards

Minimum Requirements (as of 2023) - Northern states: 14 SEER - Southern states (including CA): 15 SEER

SEER2 New testing standards (SEER2) produce slightly lower numbers for the same equipment. A 15 SEER unit might be rated 14.3 SEER2.

SEER Ranges

Basic Efficiency (14-16 SEER) - Meets minimum requirements - Lower upfront cost - Higher operating costs

Mid-Range (17-19 SEER) - Good balance of cost and efficiency - Moderate operating savings - Popular choice

High Efficiency (20+ SEER) - Highest efficiency available - Lowest operating costs - Higher upfront investment - Often includes advanced features

Calculating Savings

Example Comparison 15 SEER vs. 20 SEER - 20 SEER uses about 25% less energy - On $100/month cooling cost, saves $25/month - Annual savings depend on usage

Factors Affecting Savings - Local electricity rates - Amount of cooling needed - Current system efficiency - Climate zone

Beyond SEER

Other Important Factors - Installation quality - Proper sizing - Ductwork condition - Thermostat programming

Related Ratings - EER: Efficiency at peak conditions - HSPF: Heating efficiency (heat pumps) - AFUE: Furnace efficiency

Bay Area Considerations

Our mild climate affects SEER value:

• Less cooling needed overall
• Longer payback on high-efficiency upgrades
• But efficiency still matters during heat events
• Consider total system efficiency