Compare · Air Conditioning
HVAC Efficiency & Cost-Value Guide (SEER2, AFUE, HSPF2)
What the efficiency ratings mean, how sizing affects your bill, and how to weigh upfront cost against lifetime savings.
What the ratings mean
SEER2 measures cooling efficiency, AFUE measures furnace efficiency (as a %), and HSPF2 measures heat-pump heating efficiency. Higher is more efficient — but the right number depends on how you use the system and how long you'll keep it.
When higher efficiency pays off
If you'll stay in the home for years and run the system heavily, a higher-efficiency unit's monthly savings can outweigh its higher purchase price. For a short horizon or light use, a mid-efficiency unit may be the better value.
The sizing trap (failure mode)
Bigger is not better. An oversized AC short-cycles, never dehumidifies properly, and wears out early; an undersized one runs constantly. A proper load calculation — not a rule of thumb — is how you get it right.
Judging value, not just price
Compare total cost of ownership: purchase + installation quality + operating cost + expected lifespan + warranty. Financing can also change the monthly math.
Proof
We run real load calculations and quote from a published price book — no commissions, no surprises.
What to do next
Decide fix-or-upgrade in Repair vs. Replace, then get a free, right-sized quote.
About the author
Kenneth Ferrell · Founder
Kenneth Ferrell founded Ferrell's Air Conditioning & Heating in Shelbyville, Kentucky in 1980. With more than four decades in heating and cooling, he built the company into a Carrier Factory Authorized Dealer staffed by NATE-certified technicians and earned Carrier's President's Award. He still believes in honest prices and treating customers like neighbors.