SEER Calculator: Estimate Your AC Savings in Phoenix, AZ
In Phoenix, your air conditioner works harder than almost anywhere in the country — so how efficiently it runs shows up directly on your summer electric bill. Use the calculator below to estimate what upgrading to a higher-SEER system could save you each year, then get a firm quote from Diamond AC & Heating to see your real numbers.
What is a SEER rating?
In Phoenix, your air conditioner works harder than almost anywhere in the country — so how efficiently it runs shows up directly on your summer electric bill. Use the calculator below to estimate what upgrading to a higher-SEER system could save you each year, then get a firm quote from Diamond AC & Heating to see your real numbers.
How do you calculate SEER savings?
SEER savings come down to comparing how much electricity your current system uses versus a more efficient one. The rough formula is:
Annual cooling energy (kWh) = (system size in tons × 12,000 × cooling hours) ÷ (SEER × 1,000)
Run that for your old SEER and your new SEER, subtract the two, and multiply the difference by your electricity rate to get your yearly dollar savings. Because Phoenix runs its air conditioners far more hours per year than most of the country, the savings from a higher SEER add up faster here than almost anywhere else. The calculator above does this math for you using cooling hours typical for the Phoenix climate.
What SEER rating should I have in Phoenix?
For the Phoenix climate, most homeowners are best served by a system in the 15 to 18 SEER range. That band tends to hit the sweet spot: meaningfully lower cooling bills than an older 10-SEER unit, without the steep upfront cost of the very highest-efficiency equipment. Homes that run their AC especially hard — larger square footage, lots of west-facing glass, or a household that keeps things cold all summer — often benefit from going to 18 SEER or higher, because the extra efficiency pays back faster the more the system runs. The current federal minimum for new AC units in the Southwest is 14.3 SEER2, so anything you install new will already clear that floor.
Is a higher SEER worth it in Arizona?
In most of the country the answer is “it depends.” In Arizona, a higher SEER is worth it more often, because your air conditioner runs so many more hours each year. Every extra point of efficiency is working across a longer, hotter cooling season, so it recovers its cost faster than the same upgrade would in a milder climate. The trade-off is upfront price: higher-SEER systems cost more to buy and install. The right answer for your home depends on how long you plan to stay, how hard your system runs, and your electricity rate — which is exactly what the calculator above helps you weigh.
SEER vs. SEER2 — what changed?
As of 2023, the industry moved from SEER to SEER2, an updated testing standard that measures efficiency under conditions closer to real-world ductwork and airflow. SEER2 numbers run slightly lower than the old SEER figures for the same equipment — it’s a stricter test, not a worse unit. When you compare systems today, just make sure you’re comparing SEER2 to SEER2 so it’s apples to apples. Diamond AC & Heating can walk you through the ratings on any system we quote.
Get your real savings number
The calculator gives you a solid estimate, but your actual savings depend on your specific home, ductwork, insulation, usage, and utility plan. Diamond AC & Heating serves homeowners across the Phoenix Valley since 2008. We’ll assess your current system and your home, then show you exactly what a higher-efficiency upgrade would cost and save — with a firm quote and no pressure.
Call (602) 753-5375 or request a free estimate to get started.