SEER2 is the federal rating that shows how efficiently an air conditioner or heat pump cools. A higher number means the system uses less electricity for the same cooling. Quality Service Company, LLC helps Florence, SC homeowners match that number to their house and our long, humid summers.
Here is what the rating means, how it changed, and how to use it when you replace a system.
What does a SEER2 rating measure?
SEER2 stands for Seasonal Energy Efficiency Ratio 2. It compares the cooling a system delivers over a typical season with the electricity it uses.
The test runs the system across a range of outdoor temperatures, not just one hot day. You’ll find the number on the yellow EnergyGuide label and in the product details.
You may also see EER2. That number shows efficiency at one hot, steady test condition. Think of it as a July afternoon instead of a whole season.
How is SEER2 different from the old SEER rating?
On January 1, 2023, the Department of Energy switched to a new test. It adds more airflow resistance, closer to what real ductwork does in a home.
Because the test is tougher, the same unit scores a little lower in SEER2 than it did in SEER. The equipment didn’t get worse. The ruler changed.
So compare SEER2 to SEER2. An old SEER number and a new SEER2 number aren’t measured the same way.
What is the minimum SEER2 in South Carolina?
South Carolina is in the federal Southeast region. Since 2023, a new split-system central air conditioner installed here must rate at least 14.3 SEER2. Larger systems have a slightly lower floor.
New split-system heat pumps must meet 14.3 SEER2 nationwide. They also need a minimum heating rating, called HSPF2.
The minimum is a floor, not a recommendation. Many systems on the market rate higher.
Why does SEER2 matter for a Florence home?
Florence summers are long, hot and wet. NOAA’s 1991–2020 normals for Florence Regional Airport show about 70 days a year at 90 degrees or higher.
A typical July here has an average high of 92 and an average low near 72. SEER2 is a seasonal number, so long run time is where efficiency shows up on your bill.
Humidity is the other half of the job. A system that pulls moisture out well keeps rooms from feeling clammy at a normal setting.
Florence needs real heat in winter, too. The same NOAA normals show 2,257 cooling degree days and 2,334 heating degree days a year. That’s why one heat pump fits many homes here. If you’re weighing one, see our page on heat pump installation and service in Florence.
How do you choose the right SEER2 level for your home?
There’s no single right number for every house. Your tech will look at your home and how you use it, then lay out options at more than one level.
These questions help you decide:
- How long do you plan to stay in the home?
- Do some rooms run hot, or does the house feel damp?
- Is someone at home sensitive to heat, like an older parent or a new baby?
- Are your ducts in good shape, or leaky and crushed?
- Will the system heat the house too, as a heat pump?
Higher-rated systems often use two-stage or variable-speed compressors. They run longer at low speed. That keeps temperatures steady.
We’re an authorized dealer for Ruud and Trane HVAC equipment. Your tech will quote the work before it starts, so you can compare options side by side. Learn more about AC installation and replacement in Florence.
What else decides how efficient your new AC really is?
A SEER2 rating comes from a lab. Your home isn’t a lab. These things decide how close you get to the rating:
- A matched system. The rating applies to a specific outdoor unit paired with a specific indoor coil or air handler.
- The right size. A unit that’s too big cools fast, shuts off and leaves the air damp.
- Sound ducts. Leaks in an attic or crawlspace send cooled air where you can’t use it.
- Correct charge and airflow. Both are set at install and checked later.
- Upkeep. A clogged filter or dirty coil makes any system work harder.
Regular care helps a system keep running the way it was designed. Learn more about HVAC maintenance and tune-ups.
Common questions
Is a higher SEER2 rating always worth it?
A higher SEER2 rating isn’t worth it for every home. It uses less power for the same cooling. The gain depends on how long you stay, how hard the system runs and how well it’s installed. Florence summers mean long run times, and that’s where efficiency shows up.
Do I have to replace my AC because of SEER2?
No, SEER2 does not force you to replace a working system. In the Southeast, the 2023 rules for central air conditioners go by the date a system is installed. A system already in your home doesn’t have to meet them. An older system can still be serviced and repaired. When it’s time to replace, the new one will carry a SEER2 rating.
Do heat pumps have a SEER2 rating?
Yes, heat pumps carry a SEER2 rating for cooling and an HSPF2 rating for heating. Both numbers matter in Florence, where yearly heating and cooling needs are about the same size. A higher HSPF2 means less power to heat the house through the winter. Look at both before you choose.
Can I replace just the outdoor unit and keep my indoor coil?
Sometimes, but a SEER2 rating only holds for a matched outdoor unit and indoor coil. A mismatched pair may not reach its rated efficiency. Your tech can check whether your indoor equipment matches before recommending a repair or a full system.
Want to know what SEER2 means for your house? Call (843) 920-2004 or book online.