Phoenix summers are known for their relentless heat, with temperatures frequently soaring past 110°F. In such extreme conditions, managing your home’s air conditioning efficiently isn’t just a comfort issue — it’s essential for controlling energy bills. With the right thermostat settings, you can stay cool, protect your HVAC system, and save money year-round.
Here’s a complete guide to the best thermostat practices tailored to Phoenix’s desert climate, plus expert tips from your trusted Einstein Pros Phoenix HVAC specialists.
Why Thermostat Settings Matter in Phoenix
The U.S. Department of Energy estimates that heating and cooling account for nearly 50% of a home’s energy use. And in Phoenix, most of that goes to air conditioning. A properly set thermostat can reduce your energy bill by up to 10% annually.
The EPA’s ENERGY STAR program recommends adjusting temperatures based on when you’re home, asleep, or away — a tactic that works especially well when combined with smart thermostat technology.
Recommended Thermostat Settings for Summer in Phoenix
To strike a balance between comfort and energy savings, follow these thermostat setting guidelines:
🌞 When You’re Home (Daytime)
- Recommended Setting: 78°F
- This is the sweet spot for comfort and efficiency. According to ENERGY STAR, 78°F keeps your home cool enough without overburdening your air conditioner.
💤 When You’re Sleeping
- Recommended Setting: 80°F
- It may seem high, but ceiling fans can help offset discomfort. Raising the temperature slightly at night reduces strain on your HVAC unit.
🚪 When You’re Away
- Recommended Setting: 85°F
- There’s no need to cool an empty home. Increasing the thermostat while you’re out during the day or on vacation will dramatically lower energy use.
Use a Smart Thermostat for Maximum Efficiency
A smart thermostat learns your habits and automatically adjusts settings to optimize efficiency. You can even control it remotely using your phone — ideal for unpredictable Phoenix schedules.
Benefits of Smart Thermostats:
- Remote control via app
- Energy usage reports
- Maintenance reminders
- Integration with HVAC zoning systems
- Savings of 8%–10% annually according to ENERGY STAR
Want help with installation? Einstein Pros Phoenix offers thermostat upgrades and smart thermostat installation that align with your system and budget.
Additional Tips to Lower AC Bills in Phoenix
Phoenix summers are no joke — here are some more HVAC-saving strategies to help your system perform optimally:
✅ Schedule Seasonal Maintenance
Your HVAC system works overtime in summer. Regular tune-ups keep it running efficiently and catch small issues before they become big repairs.
✅ Use Fans to Boost Comfort
Fans can make a room feel 4°F cooler. This allows you to raise the thermostat without sacrificing comfort.
✅ Seal Air Leaks
Poor insulation and unsealed ductwork are common in older Phoenix homes. These issues cause cool air to escape and raise your bills. A quick home energy audit can identify these problems.
✅ Close Blinds & Curtains
Direct sunlight dramatically increases indoor temps. Use blackout curtains or shades during peak sunlight hours to reduce your cooling load.
What Happens If You Set the Thermostat Too Low?
Setting your AC too low (like 70°F) may seem tempting, but it comes with hidden costs:
- Higher electric bills
- Shorter system lifespan
- Increased wear on HVAC parts
- Risk of frozen coils in extreme cases
Instead, trust the science-backed guidance from ENERGY STAR and local HVAC experts.
Energy Rebates & Incentives for Arizona Residents
You may qualify for HVAC rebates or energy-saving incentives from utility providers like APS or SRP. For example:
- APS offers smart thermostat rebates of up to $75
- SRP’s energy-saving programs reward energy-efficient cooling behavior
Check out the Database of State Incentives for Renewables & Efficiency (DSIRE) for up-to-date Arizona HVAC rebate info.
Trust Einstein Pros for Phoenix HVAC Efficiency
At Einstein Pros Phoenix, we specialize in helping homeowners stay cool without overspending. From AC installation and thermostat upgrades to HVAC tune-ups and duct sealing, we’re your go-to professionals for energy-efficient solutions.
We proudly serve all Phoenix-area neighborhoods including Arcadia, Ahwatukee, Deer Valley, North Mountain, and Tempe.
📞 Ready to Save on Cooling?
Call Einstein Pros Phoenix or schedule your HVAC service online today!
Let us help you optimize your thermostat settings, upgrade to smart controls, and reduce your energy bills — one degree at a time.