It seems like an easy task to measure the efficiency of an HVAC system. You just look at how much energy you put into the unit, versus how much cooling you get out of it, right?

But energy efficiency ratings aren’t that simple. Cooling units aren’t tested in a real-world environment; they’re tested in a lab. The way these tests are conducted can make a difference in efficiency ratings. When new technology makes more accurate testing possible, the ratings can change.

The U.S. Department of Energy (DOE) enacts requirements to standardize efficiency testing, determine what minimum efficiency ratings should be, and make sure the ratings are as accurate as possible.

On January 1, 2023, the DOE put new requirements into place. This new Seasonal Energy Efficiency Rating (SEER) replaces the original standards, so it’s informally called “SEER2.” 

Here’s what you need to know about SEER2 and why it matters.

What Is SEER2?

The updated Seasonal Energy Efficiency Rating measures the cooling efficiency of air conditioners and heat pumps. It’s calculated by taking the cooling output for a typical season and dividing it by the energy input required to achieve that output.

In general, the higher the SEER2 number, the more efficient the unit will be. 

What Changed from SEER to SEER2?

SEER2 mandates new testing procedures for determining efficiency. The new procedure uses a blower capable of higher external static pressures. That means the test is more representative of real-life usage, making the results more applicable to what you’ll actually see in your home unit.

With more accurate testing, the DOE can implement more specific minimum efficiency requirements. For example, a split AC unit in the Southeast part of the country now requires a 14.3 SEER2 rating, versus a 13.8 rating under SEER.

What Does SEER2 Mean for Me?

Overall, SEER2 means that cooling units need to be more efficient to meet minimum requirements. The new testing procedures help make sure that you’re getting the efficiency the unit claims to offer.

This is good for consumers, as more efficient units help reduce monthly energy costs and can help keep your home more comfortable in warm weather. 

How to Choose the Right SEER2 Rating for Your Home

A higher SEER2 rating will help reduce your monthly energy bill and can help keep your home more comfortable throughout the summer months. But it’s true that high SEER2 units come at a higher cost. 

If you live in a humid climate with hot summers (like Minnesota!), the higher initial cost should be balanced by your monthly energy savings. If you live in a milder, drier climate, a less efficient unit (that still meets DOE minimums) could do the trick.

It’s also true that every home has different heating and cooling needs. A ductless AC unit might work best for some homes, while others would be better served with a central air split unit.

It’s always a good idea to consult an HVAC professional to help navigate the complex HVAC market. Contact the seasoned professionals at the Ray N. Welter Heating Company to answer your HVAC efficiency questions.