What is the difference between SEER and SEER2?
SEER2 is the newer version of the rating, measured with a test that better reflects real ductwork conditions. The two numbers are not directly interchangeable, so a SEER2 figure should not be compared with an older SEER figure on another unit.
Manufacturers adopted SEER2 as testing rules changed. You will see both on equipment still sold from earlier stock, which can confuse comparisons.
When you compare quotes, make sure every system is listed on the same scale. Ask the contractor to show the rating on the equipment label, not just the brochure.
Where do I find the SEER rating on my air conditioner?
The rating is printed on the yellow EnergyGuide-style label that came with the unit and often on the data plate on the outdoor condenser. The model number can also be looked up with the manufacturer to confirm the exact rating.
The data plate sits on the side of the outdoor cabinet. It lists the model, serial number, electrical details and refrigerant type, which are useful when you call for service.
If the label is faded, a technician can read the model number and find the specifications. Take a photo of the plate so you have it on your phone.
Is a higher SEER rating always better in Arizona?
Not always. A higher rating saves more energy during long cooling seasons, and Arizona AC systems run most of the year. But the best choice also depends on correct sizing, duct condition, installation quality and the budget you have to work with.
A high-efficiency unit installed on leaky or undersized ducts will not deliver the performance the label suggests. The duct system matters as much as the outdoor unit.
Equipment that fits the home and is installed correctly often serves better than a top-rated unit that is oversized or poorly matched to the air handler.
What other things affect how efficiently my AC runs?
Sizing, duct leaks, refrigerant charge, coil cleanliness, air filter condition and thermostat settings all affect real-world efficiency. A well-maintained mid-range system often performs better than a neglected one with a higher rating. Even a high rated unit performs poorly when these basics are ignored or installed poorly.
Dust from monsoon storms and desert wind loads coils quickly. Dirty coils make the compressor work harder and shorten its life.
Shade, attic insulation, and window coverings also lower the load. Anything that reduces heat entering the house reduces the hours the AC has to run.
How do I choose the right SEER rating for my home?
Start with a proper load calculation for your home, then compare efficiency options that fit your ducts and budget. A licensed contractor can walk through the tradeoffs and explain what each option means for your house instead of just pushing the highest number.
Ask whether your existing ductwork can handle the new equipment. Duct changes sometimes cost more than the efficiency upgrade itself.
Vortech Air-Conditioning & Electrical provides AC installation and replacement in Peoria, Glendale, Sun City, Sun City West and Surprise. Use the call button on this page to talk through your home.
More questions: AC Replacement: 12 Questions Homeowners Ask Most