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A Simple Guide to Understanding Air Conditioner and Furnace Energy Ratings
If you’ve ever shopped for a new air conditioner or furnace, you’ve probably seen energy rating data listed on the products. Knowing what those acronyms and numbers mean, and how to compare them, can save you a lot of money over the life of your HVAC equipment.
An overview of SEER, AFUE, EER, HSPF
These acronyms are used frequently in the heating and cooling business, but what do they really mean?
- SEER – A measurement of the electrical input used to operate the system, versus how much cooling it provides.
- AFUE – A way to measure the efficiency of furnaces that use fossil fuel.
- EER – Similar to SEER, but with calculations for higher temperatures and the removal of humidity.
- HSPF – Used for heat pumps, as a comparable bit of information to SEER, EER, and AFUE ratings.
All of these measure efficiency. The higher the efficiency rating, the greater the energy savings as less energy will be used.
Government standards: What makes an ENERGY STAR system?
There are minimum qualifications that systems must meet or exceed to be considered ENERGY STAR rated. You’ll save more money on your energy bills when you buy a system with this type of rating, but remember that ENERGY STAR rated systems also often cost a little bit more up front. You’ll make that money back in time, though, and will continue to see cost and savings benefits.
How SEER and EER affect cost
SEER and EER affect cost, and the price difference is often regional. Hotter, more humid climates may mean larger price jumps when moving from one SEER or EER rating to another, for example, because of the added work the system must do. A choice between 14 or 15 SEER may mean a difference of around $1,000, and a 21 SEER system may cost a homeowner up to 40% more than a 14 SEER system. The key is to balance the budget you have for your new system against the efficiency you’re looking for, and come to a meeting point that provides the best of both.
No matter what ratings you choose for your new system, you can take steps around the home to drive its efficiency even higher. Talk to your HVAC contractor about sealing air leaks and upgrading insulation, and be sure to have the ductwork sized when installing new equipment.
Proper installation and care for the system goes a long way toward helping it operate at peak efficiency for many years.
