Best Smart Thermostat for APS TOU Rates in Arizona (2026)

If you are on an APS time-of-use plan, a smart thermostat is the single highest-ROI upgrade you can make. No solar panels, no battery walls, no contractor visits. Just a $60-$220 device that shifts when your AC runs and saves you real money every month.

Here is why it matters: APS charges $0.3439/kWh during peak hours (4-7 PM), but only $0.0903/kWh during super off-peak. That is a 3.8x price difference for the exact same electricity. Your AC is your biggest load, and running it hard before 4 PM then coasting through peak can save $50-100/month in summer. A smart thermostat automates this strategy so you never have to think about it.

If you are not sure which APS plan you are on, start with our APS time-of-use rates guide or run the numbers through our APS bill calculator.

How TOU-Aware Scheduling Saves Money

The strategy is straightforward: pre-cool your home during the cheapest hours, then let it coast through peak.

Set your thermostat to cool the house to 73°F by 3:30 PM while electricity is still at the super off-peak rate ($0.0903/kWh). Then raise the setpoint to 78°F at 4 PM when peak pricing kicks in. Your well-insulated Arizona home holds that thermal mass for 2-3 hours, and the AC barely runs during the $0.34/kWh window.

A smart thermostat automates this daily. You program the schedule once, and it handles the transitions automatically. The better models (ecobee and Nest) learn your home's thermal behavior and start pre-cooling at exactly the right time so you hit 73°F right before the peak window opens. For the full APS off-peak hours and holiday schedule, see our dedicated guide.

1. ecobee Smart Thermostat Premium — Best Overall

~$220 | Built-in Siri & Alexa | SmartSensor | Air Quality Monitor

The ecobee Premium is the best all-around pick for Arizona TOU optimization. Its SmartSensor system detects which rooms are occupied and adjusts cooling accordingly. This is critical in Arizona homes where west-facing bedrooms can be 5-8°F hotter than the rest of the house by late afternoon.

Schedule your TOU pre-cooling directly in the ecobee app with comfort settings tied to specific time blocks. Geofencing detects when you leave and automatically switches to an energy-saving mode, then pre-cools before you return. The built-in air quality monitor is a bonus during monsoon dust storms.

Why it wins for APS TOU: SmartSensor room-level control means you pre-cool only occupied rooms. Geofencing prevents wasting energy cooling an empty house during peak hours.

2. Google Nest Learning Thermostat (4th Gen) — Best for Google Homes

~$280 | Adaptive Eco | Learning Schedule | Google Home Integration

The 4th-gen Nest Learning Thermostat lives up to its name: it learns your pre-cool pattern within a week and starts adjusting automatically. Set it manually for the first few days, and the Adaptive Eco feature takes over, optimizing the schedule based on your home's actual thermal performance.

The Nest app gives you remote control when Arizona heat spikes unexpectedly. If a 118°F day hits and your house is warming faster than usual, you can bump pre-cooling earlier from your phone. Deep Google Home integration means voice commands work seamlessly if you are already in that ecosystem.

Why it works for APS TOU: The learning algorithm adapts to your specific home. It figures out exactly how early to start pre-cooling to hit your target temperature before peak hours begin.

3. Honeywell Home T9 — Reliable Mid-Range Pick

~$170 | Room Sensors | 7-Day Scheduling | Alexa & Google

The Honeywell T9 does the TOU scheduling fundamentals well at a lower price point. Its 7-day custom scheduling lets you program different pre-cool times for weekdays and weekends. Room sensors detect which rooms are occupied and prioritize cooling there, which matters when your west-facing living room is baking while the east-side bedrooms are comfortable.

Honeywell is the brand most HVAC technicians in Arizona already know and trust. If you want straightforward TOU scheduling without a learning curve, the T9 delivers without the premium price of the ecobee or Nest.

Why it works for APS TOU: Simple, reliable 7-day scheduling covers the basics. Room sensors prevent over-cooling unoccupied spaces during your pre-cool window.

4. Amazon Smart Thermostat — Budget Pick

~$60 | Energy Star Certified | Alexa Built-In | Hunches Feature

At $60, the Amazon Smart Thermostat pays for itself in a single month of TOU savings. It supports custom scheduling for your APS peak and off-peak windows, and the Hunches feature learns your habits over time to make automatic adjustments.

It lacks room sensors and the advanced learning algorithms of the premium picks. But for straightforward TOU scheduling — cool hard before 4 PM, coast through peak — it gets the job done at one-quarter the price. If you are not sure whether TOU optimization is worth the effort, this is the no-brainer entry point.

Why it works for APS TOU: Custom scheduling handles the pre-cool strategy. At $60, the ROI is measured in weeks, not months.

Side-by-Side Comparison

Which One Should You Buy?

On a budget: The Amazon Smart Thermostat (~$60) handles TOU scheduling and pays for itself in one summer month. If you just want to try the pre-cool strategy without a big investment, start here.

Best overall: The ecobee Smart Thermostat Premium (~$220) is the pick for most Arizona homeowners. SmartSensor room control, geofencing, and robust scheduling make it the most complete package for TOU optimization.

Google ecosystem: If you already use Google Home and Nest devices, the Nest Learning Thermostat 4th Gen (~$280) fits seamlessly. The adaptive learning is genuinely useful once it dials in your home's thermal profile.

Reliable and simple: The Honeywell T9 (~$170) is the safe choice if you want a trusted brand with straightforward scheduling and room sensors without the premium price.

Whichever you pick, pair it with our complete APS TOU rates guide to make sure your schedule is dialed in to the latest rate windows.

Frequently Asked Questions

Can a smart thermostat work with APS TOU rates?

Yes. All four thermostats in this guide support custom scheduling that aligns with APS time-of-use windows. You program pre-cooling during super off-peak hours and let the house coast through the expensive 4-7 PM peak window. The ecobee and Nest models can learn your pattern and automate it over time.

How much can I save with a smart thermostat on APS?

Most Arizona homeowners save $50-100 per month during summer by pre-cooling before peak hours. APS peak rates hit $0.3439/kWh from 4-7 PM while super off-peak is $0.0903/kWh. Shifting your heaviest cooling to off-peak windows can cut your summer bill by 25-40%.

Do I need a C-wire for a smart thermostat?

Most modern smart thermostats need a C-wire (common wire) for consistent power. If your home does not have one, the ecobee includes a Power Extender Kit that works as a substitute. The Amazon Smart Thermostat also includes a C-wire adapter. Older Arizona homes built before 2000 often lack a C-wire, so check your wiring before purchasing.

Which smart thermostat works best with solar panels?

The ecobee Smart Thermostat Premium integrates with most solar inverter monitoring apps and supports eco+ community energy savings programs. For Google Home users, the Nest Learning Thermostat works with Nest Renew to prioritize cleaner energy when available. Both let you align cooling schedules with your solar production window for maximum self-consumption.