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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Set your smart thermostat around the times people actually wake, leave, return, and sleep. Keep the occupied temperatures your household already finds comfortable, then try modest heating setbacks or cooling set-ups during predictable sleep or away periods. If rooms feel uncomfortable when the schedule changes, reduce the temperature change or begin recovery earlier.
Build the schedule around your household
Write down the usual wake-up, departure, return, and bedtime for weekdays and weekends. Create only the schedule periods that reflect real changes in occupancy: an “away” period is unhelpful if someone is usually home then. Smart thermostats differ: some use schedules you enter, some learn patterns, and some can use occupancy or geofencing features. ENERGY STAR notes that features vary by product, so check what your thermostat supports and how to override an automated change if your plans differ. ENERGY STAR’s smart thermostat guidance
Choose comfortable occupied settings first
Use the temperatures household members already prefer when they are home as the occupied settings. There is no single setpoint or setback size established as comfortable for every home: climate, personal preference, occupancy, and HVAC equipment affect both comfort and results. ENERGY STAR’s FAQ estimates average savings of about 8% of heating and cooling bills, or $50 per year, but says actual savings vary with those factors; treat that as an estimate, not a guarantee for an individual home. ENERGY STAR’s FAQ
Add sleep and away periods gradually
For a heating schedule, a lower temperature during sleep or an empty-home period is the conventional setback direction. For cooling, the corresponding direction is a higher temperature. Start with a change that household members can tolerate rather than aiming for a universal number of degrees; the sources do not establish one ideal setback size. Check comfort when the next occupied period begins and adjust the schedule if needed. ENERGY STAR uses “set a schedule” as a requirement for certified smart thermostats, while the U.S. Department of Energy describes programmable and smart thermostat operation and recovery. ENERGY STAR’s Smart Thermostats Key Product Criteria · U.S. Department of Energy Building Science Education: Programmable Thermostats
#1 Best Overall
- ENERGY STAR certified smart thermostat for home that helps you save energy and stay comfortable.Connectivity : Wi-Fi - 802.11b/g/n 2.4 GHz, 802.11a/n 5 GHz Wi-Fi., Wireless interconnect : Bluetooth Low Energy Please refer to the product description section below for all applicable legal disclaimers.Product note: You can also check your system’s compatibility before purchasing a Nest thermostat with our online Nest Compatibility Checker on the Google Nest support page
- The Nest Thermostat is designed to work without a C wire in most homes, but for some systems, including heating only, cooling only, zone controlled, and heat pump systems, you’ll need a C wire or other compatible power accessory
- Nest Thermostat turns itself down when you leave, so you don’t waste energy heating or cooling an empty home. Lock feature: No
- Programmable thermostat that lets you create an energy efficient schedule in the Google Home app on your Android or iPhone
- Remote control lets family members change the thermostat temperature from anywhere on a phone, laptop, or tablet[1]
Give the system time to recover
If the home is still too warm or too cool when an occupied period starts, either schedule the change back earlier or make the sleep/away adjustment smaller. Some thermostats offer adaptive recovery or preheating so the system begins moving toward the next setting before its scheduled start. The feature and its behavior depend on the thermostat and HVAC system. Google Nest, for example, describes Early-On as a way to reach a scheduled temperature by its target time; availability depends on the thermostat and system. Google Nest Help: Early-On
Address hot and cold rooms without assuming they are separate zones
First check whether the thermostat’s built-in sensor reflects the rooms where people spend time. Sun exposure and insulation can make temperatures differ across a single-zone home. A compatible remote temperature sensor can help the thermostat account for those differences, and some occupancy sensors can prioritize high-traffic rooms. But a sensor informs the control strategy; it does not give a single-zone HVAC system independent room-by-room control. Confirm sensor compatibility with the thermostat before buying one. ENERGY STAR’s smart thermostat guidance
Rank #2
- An Alexa thermostat - Amazon Smart Thermostat is an easy way to switch from a traditional thermostats for homes and help reduce energy usage.
- Create comfort zones throughout your home by connecting to select Alexa devices to automatically adjust heating and cooling based on temperature readings or presence detection.
- Save money and energy - After purchase, Amazon will send you an email with details about home thermostat rebates that may be available from energy providers in your area.
- Save energy - According to EPA estimates, ENERGY STAR certified thermostats save an average of $90 on yearly energy bills.
- Programmable thermostat and automatic control - Create your own home, away and sleep schedules, or have Alexa automatically control the temperature with Alexa+ advanced features.
Use extra care with heat pumps
On a heat pump with auxiliary heat, a rapid recovery may use auxiliary heat, depending on the equipment and thermostat settings. Google Nest’s Heat Pump Balance offers Max Comfort, Max Savings, and Balanced modes to adjust auxiliary heat use, and Nest notes that auxiliary heat may cost more than running the heat pump. These options describe supported Nest configurations, not a universal rule for every heat pump. Check the thermostat and HVAC manufacturers’ instructions, avoid assuming a large setback is appropriate, and review system-use information after changing the schedule. Google Nest Help: Heat Pump Balance
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check compatibility before installing or replacing a thermostat
Confirm that the thermostat works with your heating and cooling equipment and wiring. ENERGY STAR says most, but not all, smart thermostats use a C-wire; a missing C-wire can affect model choice or require an adapter. Variable-speed, multi-stage, and zoned systems can need more careful compatibility checks, and the equipment manufacturer’s recommended control may be preferable for variable-capacity equipment. Seek qualified help if the wiring or system configuration is unclear. ENERGY STAR’s smart thermostat guidance
Rank #3
- Save up to 23% every year on heating and cooling costs, adjusts to your set schedule to save energy when you’re gone and optimize comfort when you’re home. Compared to a hold of 72
- Compatible with 85% of systems, check your system’s compatibility with our online ecobee Compatibility Checker on the ecobee support page
- Change your temperature by easily tapping the color touchscreen or using the ecobee app. Plus, free software upgrades ensure you get the best out of your Smart Thermostat Essential, for years to come
- Automatically adjusts to your set schedule to save energy when you’re gone and optimize comfort when you’re home. Keep track of your energy consumption when you're on the go on the ecobee app
- Easy DIY install. No C Wire, no problem. Get the ecobee Power Extender Kit (PEK) for homes without a C-Wire and keep your walls looking nice with our trim kit – both sold separately
For context, ENERGY STAR’s current certification criteria (accessed 2026) require heating-runtime reduction thresholds of at least 8% at the lower 95% confidence limit of the weighted national average, and at least 4% for the weighted national average of 20th percentiles. The corresponding cooling thresholds are at least 10% and 5%. These are certification criteria based on runtime, not promises of a particular household’s bill savings. ENERGY STAR’s Smart Thermostats Key Product Criteria
Quick Recap
Rank #4
- EASY DIY INSTALLATION: Do it yourself fast with a built-in level and simple step-by-step instructions. Works with the HVAC equipment found in most homes
- COMMON WIRE REQUIREMENTS: Common wire(C-Wire) required for heat pump and heat/cool only systems. C-wire not required on most systems
- SAVE ABOUT 23% ON HVAC ENERGY: ENERGY STAR-certified and packed with features that help you save money, including flexible scheduling, geofencing, remote access and usage reports
- PRIVACY PROTECTION: Sensi won’t sell your personal information to third parties or leverage your thermostat activity data for targeting or advertising purposes
- CONTROL FROM ANYWHERE: The top-rated mobile app for Android and iOS devices makes it easy to control your comfort from a smartphone or tablet
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