Why Efficiency Ratings Matter
Efficiency ratings directly translate to operating costs. Higher efficiency means lower utility bills, though equipment costs more upfront. Understanding ratings helps you make informed decisions.
SEER: Seasonal Energy Efficiency Ratio
SEER measures air conditioner cooling efficiency over a typical cooling season. Higher SEER means better efficiency. Minimum required is 14-15 SEER (varies by region); premium units reach 25+ SEER.
SEER2: The New Standard
As of 2023, SEER2 uses updated testing procedures that better reflect real-world conditions. SEER2 numbers are slightly lower than equivalent SEER1 ratings.
AFUE: Annual Fuel Utilization Efficiency
AFUE measures furnace heating efficiency as a percentage. An 80% AFUE furnace converts 80% of fuel to heat; 20% goes up the flue. High-efficiency furnaces reach 95-98% AFUE.
HSPF: Heating Seasonal Performance Factor
HSPF measures heat pump heating efficiency. Like SEER, higher is better. Current minimum is 8.8 HSPF; premium models reach 13+ HSPF.
Balancing Efficiency and Cost
Higher efficiency equipment costs more upfront but saves money over its 15-20 year lifespan. The ideal efficiency depends on your climate, usage patterns, and utility rates.