Every quote for a new system comes with a string of letters and numbers. Here's what they mean, and how much they should weigh in your decision here on the Central Coast.
Cooling: SEER2 and EER2
SEER2 (Seasonal Energy Efficiency Ratio) measures how efficiently an air conditioner or heat pump cools over a typical season. Higher is more efficient. The "2" means it was tested under the updated federal method that took effect in 2023, which gives lower numbers than the old SEER for the same equipment, so compare SEER2 to SEER2.
EER2 measures efficiency at a single hot condition. It matters more where it's very hot for long stretches.
Heat pump heating: HSPF2
HSPF2 (Heating Seasonal Performance Factor) is the heating version of SEER2 for heat pumps. Higher is more efficient. In a mild winter like ours, a heat pump spends most of its time in conditions where it's at its most efficient.
Furnaces: AFUE
AFUE (Annual Fuel Utilization Efficiency) is the share of the gas that becomes heat in your house. An 80% furnace turns 80 cents of every gas dollar into heat; a 95% or higher furnace turns 95 cents or more. High-efficiency furnaces vent through plastic pipe and drain condensate, which can mean extra work in some installations.
What's worth it here
Higher ratings save the most where a system runs the most. In much of Santa Barbara County, mild weather means systems run less than in hot or cold climates, so a top-rated unit takes longer to pay back its extra cost. Other features can matter as much:
- Two-stage or variable-speed equipment runs longer at lower output: quieter, more even temperatures, better dehumidifying.
- Ductwork that doesn't leak can save more than a few points of SEER2.
- The right size, above all. See what size system you need.
- Rebates, which often require a minimum rating. See HVAC rebates in Santa Barbara.
Comparing quotes
When two quotes list different ratings, ask for both the outdoor unit's and the indoor unit's model numbers. A system's rating depends on the matched pair, and the certified combination can be looked up in the AHRI directory.
Quotes on new and replacement equipment are free: call 805-965-6326 or send us a message, and we'll walk you through the options.
Related
More tips on costs & permits, heat pumps.