Finding the right thermostat setting in an Arizona summer can feel very tricky. When temperatures climb past 110°, your AC works overtime just to keep things livable. With energy bills rising, homeowners in the Valley often ask: What is the best thermostat setting to stay cool and save money?
At Norris Air, we’ve been helping Arizona families stay comfortable since 1973. Our Mesa Air Conditioning experts know the challenges that come with desert living, and we’re here to help you find that sweet spot between comfort and cost-efficiency. Whether you’re home, away, or winding down for the night, this guide will help you make smarter choices with your thermostat—and reduce strain on your AC system along the way.
Comfort, Efficiency, and Smart Tips for Beating the Heat
The U.S. Department of Energy recommends setting your thermostat to 78°F when you’re home during the summer. While that may sound a little high to some folks, this temperature strikes a good balance between comfort and energy savings—especially when paired with ceiling fans and energy-efficient window coverings.
But in Arizona’s triple-digit heat, 78° can still feel warm depending on your home’s layout, insulation, and AC performance. That’s where smart thermostat usage really comes into play. Here’s a breakdown of ideal settings based on your daily routine:
When You’re Home: 76–78°F
If your household tends to run warm or you’re particularly sensitive to heat, setting your thermostat to 76°F can offer a bit more comfort without dramatically increasing your energy bill. Just remember: every degree you lower your thermostat can increase your cooling costs by up to 3%–5%.
Use ceiling fans to help circulate cool air and make your space feel up to 4 degrees cooler—which means you can stay comfortable even if the thermostat is set slightly higher.
When You’re Away: 85°F
If you’re heading to work for the day or running errands for several hours, bumping your thermostat up to 85°F will prevent your system from working overtime while still protecting your home (and pets, if you have them) from extreme heat buildup.
Leaving your AC off completely in Arizona is not a good idea. The intense heat can cause damage to electronics, dry out wood furniture or flooring, and make your home feel like a sauna when you return.
While You Sleep: 74–78°F
Nighttime temperatures in the desert don’t always cool off like they should—but your body temperature does naturally drop when you sleep. Setting your thermostat between 74 and 78°F can keep you cool without pushing your system too hard.
To improve comfort, our HVAC Mesa AZ Experts recommend trying using breathable sheets, keeping bedroom doors open for better airflow, and placing fans near your windows to draw in cooler night air if temps allow.
Maximize Savings with a Programmable or Smart Thermostat
If you’re still adjusting your thermostat by hand multiple times a day, it might be time to upgrade. Programmable and smart thermostats are game changers for managing Arizona AC usage:
Set It and Forget It
Program temperature changes based on your schedule—like bumping the temp up when you’re at work and cooling things down before you get home.
Reduce Energy Waste
No more forgetting to adjust the thermostat when you leave the house. Smart thermostats make it automatic.
Control from Anywhere
Running late? Headed home early? You can control most smart thermostats from your phone so your home’s cool when you need it.
Track Usage & Get Suggestions
Many models offer energy reports and cost-saving tips based on your usage patterns—making it easier to adjust without sacrificing comfort.
At Norris Air, we install and service a range of programmable and smart thermostats across Mesa, Chandler, Gilbert, and beyond. We’ll help you choose the right model for your home and walk you through setup so you can start saving right away.
Tips to Help Your AC Work Smarter, Not Harder
Even the best thermostat settings won’t do much if your system is working overtime. Here’s how to reduce strain on your AC while keeping your home cooler:
- Close blinds and curtains during peak sunlight hours
- Use fans to help circulate cooled air
- Avoid using ovens or heat-producing appliances during the day
- Make sure your home is properly insulated
- Schedule regular maintenance to keep your system running efficiently
- Replace air filters every month during peak season
Trust Norris Air to Keep You Comfortable
Summers in Arizona are no joke—but with the right thermostat settings and a little expert guidance, your home can stay cool without draining your wallet. At Norris Air, we’re not just here for emergency repairs—we’re here to help you get the most out of your HVAC system year-round.
Whether you need a thermostat upgrade, an AC tune-up, or advice on improving your home’s energy efficiency, our team is just a call away.
Searching for emergency ac repairs near me? We’re here to help. Reach out to Norris Air today—your Arizona comfort experts since 1973.