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Serving King County and Snohomish County

Serving King County and Snohomish County


Evergreen State Heat & AC Blog

Help in Understanding Commercial AC Efficiency Ratings


The best cooling for your commercial property is an AC system that provides the right level of cooling capacity and energy efficiency. It’s easy to make a mistake one direction or the other, and often the error is purchasing a system that can provide enormous cooling on demand but which requires a fortune to run. You don’t want commercial cooling that completely throws off your budget. And, thanks to our professional services for commercial air conditioning in Everett, WA, you don’t have to.

We can help you better understand the efficiency ratings of commercial ACs so you can navigate the options available and find the right balance of cooling performance and energy savings. To ensure you have the right new equipment and it’s installed to the highest standards, make an appointment with us.

Commercial Air Conditioners: EER and SEER

There are two important efficiency ratings to consider for commercial ACs: EER (energy efficiency rating) and SEER (seasonal energy efficiency rating). As you might be able to tell from the names, they’re similar to each other. 

EER is a ratio of the amount of cooling a system outputs (measured in BTUs) to the amount of electricity consumed (measured in watt-hours) as measured under specific conditions (temperature, humidity). The higher the EER, the more efficient a unit is at converting electricity into cooling.

SEER is the same ratio, except instead of being determined under a single set of conditions, it is tested over a range of temperatures and humidities to simulate a full season of use. A simpler way to think about it: EER is a snapshot of an air conditioner’s efficiency, while SEER is an average of a full summer’s worth of work. EER is always lower than SEER for a single system, and more emphasis is put on SEER.

For an AC system to earn the US Department of Energy’s ENERGY STAR label, it must have a SEER of at least 14.5 and an EER of at least 11. 

Commercial Heat Pumps: HSPF

Many commercial facilities use rooftop packaged units that are heat pumps. Because heat pumps work similar to air conditioners, they also use EER and SEER. But they have a third efficiency rating for when they are in heating mode, HSPF (heating seasonal performance factor). It’s measured the same way as SEER, except it measures heating output rather than cooling output. HSPF is always lower than SEER; the ENERGY STAR requirement for a packaged heat pump is a minimum of 8.2 HSPF.

Finding the Balance

It’s important to know that an efficiency rating isn’t a promise of savings. A poorly sized and installed AC or heat pump will still waste money, no matter its efficiency rating. This is why you need to hire experts like ours to handle selecting the unit and installing it. We’ll see you have the balance of indoor comfort with the energy savings that you want. We are certified and union-trained in light commercial HVAC service and offer a 3-year labor warranty on all installations with regular maintenance.

Evergreen State Heat & AC serves King County and Snohomish County. Call us for commercial HVAC services—get an immediate response!

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