Recommended Free Tools
Use modest, automatic temperature changes that match your routine. In winter, start around 68–70°F while you are home, then set the thermostat back 7–10°F whenever the house will be empty for about eight hours or longer. In cooling season, choose the highest indoor temperature everyone can comfortably tolerate. Let a schedule, geofencing, occupancy sensing and gradual recovery restore comfort before people return. The right setting depends on your occupants, climate and HVAC equipment—not on one universal number.
The settings that usually save the most without sacrificing comfort
A smart thermostat saves energy by conditioning the house less when people are asleep or away, then returning to a comfortable target before the next occupied period. The most defensible starting point from current U.S. guidance is:
As an Amazon Associate I earn from qualifying purchases.
- Home in winter: begin near 68–70°F, then move up or down to the lowest temperature the household finds comfortable.
- Away in either season: for an absence of roughly eight hours or more, use a 7–10°F setback from your normal heating or cooling target.
- Home in summer: set cooling to the highest temperature occupants can comfortably tolerate rather than chasing a fixed national number.
- Sleep: use a smaller change than an all-day absence if anyone wakes up cold, hot or congested.
The U.S. Department of Energy (DOE) says a 7–10°F setback for at least eight hours can save as much as 10% per year on heating and cooling costs. That is an upper-end estimate, not a promise for every home. DOE also states that Americans may choose whatever temperature they prefer; its 68–70°F winter figure is a starting point for testing comfort, not a rule.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
“When you’re away from your home, set the temperature back 7°-10°F.” — U.S. Department of Energy, Energy Saver bulletin, February 2, 2024.
#1 Best Overall
ecobee Smart Thermostat Essential - WiFi Thermostat, Energy Star Certified
- 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
Why a setback saves energy
Heating and cooling loads grow when the indoor-outdoor temperature difference grows. During an absence, allowing the indoor temperature to drift toward outdoor conditions reduces that difference for part of the day. A smart thermostat makes the change repeatable instead of relying on someone to remember it.
The saving opportunity is largest when the home is empty for a predictable block of time. A two-hour errand may not justify a large change, especially if the system must immediately recover. For irregular schedules, a smaller setback or occupancy-based control can avoid repeated overrides.
Recovery is not free: the system must run to bring the home back to its target. The net result depends on the length of the setback, weather, insulation, equipment efficiency and how aggressively the thermostat recovers. That is why comparable monthly runtime or energy reports are more useful than a single day’s total.
Build a schedule around real occupancy
Do not begin by copying a preset schedule. Observe how the household actually uses the home, then make the thermostat follow that pattern.
Rank #2
- High use of the scheduling feature of the T5 thermostat saved customers between 8 and 16% on heating and cooling bills. Dollar savings range based on nationwide average annual single-family detached home's heat and cooling bills; actual savings varies based on consumption.
- Save Energy and Get Rewarded. Check with your energy provider about available energy savings rebates to save on your purchase. Plus, eligible customers can enroll in their local Utility's "DEMAND RESPONSE PROGRAM" which can reward you for allowing the utility to slightly adjust your AC or furnace temperature settings when there is high energy demand.
- 7-Day Flexible Scheduling or Location Based Temperature Control. It’s your choice. 7-day scheduling programs your thermostat. Geofence technology helps make you comfortable by using your smartphone’s location to know when you’re away and when you return.
- Auto Home and Away Mode. Enjoy ideal temperatures at home, then save when away.
- ENERGY STAR certified. Help save energy, track your heating and cooling with monthly energy reports and get personalized tips on reducing energy use.
- Record one representative week. Note when the first person wakes, when the last person leaves, when anyone returns, bedtime, and any rooms that need a different temperature. Include weekends, school runs and work-from-home days.
- Create three periods. Use an occupied period for normal activity, a sleep period if that improves comfort, and an away period for a reliably empty house. Keep the number of transitions small enough that people will not constantly override them.
- Set occupied targets by comfort. In winter, test the DOE starting point of 68–70°F and choose the lowest acceptable value. In summer, choose the highest cooling target that feels comfortable to everyone who is present.
- Add the away setback. Apply the full 7–10°F change only when the home will be empty for about eight hours or longer. For shorter or uncertain absences, start with a smaller change.
- Program recovery before arrival. Have the thermostat begin restoring the target early enough that the home is comfortable when people arrive. A gradual recovery avoids a last-minute demand for maximum output.
- Review overrides. Every manual change is feedback. If occupants repeatedly cancel a period, move its time or make the temperature change less aggressive rather than blaming the user for overriding it.
A practical period plan
| Period | How to choose the target | When to use it |
|---|---|---|
| Occupied | Lowest heating or highest cooling setting that everyone accepts | People are awake and using the home |
| Sleep | A modest change only if it remains comfortable overnight | Bedrooms are occupied and the household is asleep |
| Away | Set back 7–10°F for an absence of about eight hours or more | The house is predictably empty |
Use smart features as safeguards, not substitutes for a schedule
Geofencing
Geofencing can switch to an away mode when the phones associated with the household leave a defined area and restore comfort when someone returns. Add every regular occupant’s phone and check what happens when a phone battery dies, location permission is disabled or a guest remains home. Geofencing should supplement a schedule; it should not be the only protection against an unexpectedly occupied house.
Occupancy sensing
Occupancy sensors can pause an away setback when motion or presence is detected. Place compatible sensors where people actually spend time, and verify whether the thermostat treats a quiet room as occupied. A sensor that misses a napping child or a person working at a desk can create uncomfortable decisions.
Learning schedules
Learning systems infer routines from adjustments and may propose times or temperatures. Accept changes only after checking that they reflect the whole household, including weekends and days off. A learned schedule that fits one person can be wrong for everyone else.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Vacation mode
Use vacation mode for multi-day absences so the normal daily schedule does not call for comfort conditioning while the house is empty. Set a return time that leaves enough recovery time, and follow any freeze-protection or equipment guidance for your system.
Rank #3
- PRIVACY PROTECTION*: Sensi won’t sell your personal information to third parties
- EASY DIY INSTALLATION: Use the built-in level and step-by-step app instructions for a quick installation. Works with HVAC equipment found in most homes. Common wire (c-wire) is not required in most applications
- SAVE ABOUT 23% ON HVAC ENERGY*: The ENERGY STAR-certified Sensi smart thermostat can help you save energy with features like flexible scheduling, remote access and usage reports
- SIMPLE CONFIGURATION: Looks and feels like a thermostat. Has buttons and fits the same space as a traditional thermostat so you don’t have to patch and paint your walls
- SMART MAINTENANCE: Sensi can help monitor the performance and efficiency of your HVAC system by delivering valuable usage reports, alerts about your equipment, and maintenance reminders like filter replacement
Room sensors
Room sensors can make a central thermostat respond to the room that matters most, but they cannot make separate zones from a single-zone HVAC system. Compare sensor readings with a trusted thermometer and avoid placing a sensor near a vent, window, appliance or direct sunlight.
Check HVAC compatibility before changing settings
Temperature programming cannot correct an incompatible installation. Before buying or wiring a thermostat, identify the equipment and its control requirements:
- Heating and cooling type, including conventional furnace-and-air-conditioner systems and heat pumps.
- Number of heating and cooling stages, plus whether the equipment has variable-capacity output.
- Single-zone or multi-zone operation and the type of zone control panel.
- Whether the thermostat requires a C-wire for continuous power, or supports a manufacturer-approved alternative.
- Voltage and wiring requirements; line-voltage systems are not interchangeable with low-voltage residential controls.
- Manufacturer instructions for staging, auxiliary heat, humidity controls and proprietary equipment.
Multi-stage, variable-speed, zoned and some heat-pump systems may need specialized setup or professional installation. Photograph existing wiring, record terminal labels and use the equipment documentation rather than assuming that a wire color identifies a function.
Special caution for variable-capacity equipment
Newer variable-capacity systems can respond differently to a large setback. DOE benchmarking work warns that recovery may trigger a high-capacity, lower-efficiency operating mode. ENERGY STAR separately advises following the equipment and thermostat manufacturer’s guidance for variable-capacity heat pumps and air conditioners. After changing a schedule, watch comfort, runtime and operating mode; a dramatic setback is not automatically efficient if recovery repeatedly invokes the highest capacity.
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
How much money can a smart thermostat save?
National figures provide context, not a household-specific forecast. Heating and cooling account for a large share of typical U.S. energy use, but the value of a setback depends on climate, building envelope, occupancy, equipment and rates.
| Published figure | What it means | Qualification |
|---|---|---|
| Almost half of an average American household’s annual energy bill; more than $900 per year | National context for the potential size of heating and cooling costs | ENERGY STAR consumer guidance; an average context figure, not an individual prediction |
| Approximately 8% of heating and cooling bills, or about $50 per year | Average reported savings associated with an ENERGY STAR smart thermostat | ENERGY STAR FAQ; varies with climate, occupancy, comfort preferences and HVAC equipment |
| At least 8% lower-bound weighted national heating runtime and 10% cooling runtime | ENERGY STAR certification thresholds for field performance | Certification criteria, not a guarantee for a particular installation |
| Weighted 20th-percentile thresholds of 4% heating and 5% cooling runtime reduction | A lower performance boundary used in the certification framework | ENERGY STAR Smart Thermostats Key Product Criteria |
| Up to 10% annual heating and cooling cost savings | Potential from a 7–10°F setback maintained for at least eight hours | DOE 2024 guidance; “as much as” is an upper estimate |
ENERGY STAR says only thermostats carrying its label have been independently certified using actual field data to demonstrate energy savings. Even that certification uses aggregated results and national thresholds. Weather, occupancy and user behavior can make your result higher or lower.
Measure the change without fooling yourself
- Keep the schedule stable. Compare periods with similar weather and occupancy rather than comparing a mild spring month with a heat wave.
- Use runtime reports directionally. Monthly heating and cooling runtime can reveal whether a setback reduced operation, but it is not the same as energy consumption or cost.
- Check utility bills alongside weather. Rates, billing periods and outdoor temperatures change. A lower bill does not prove the thermostat caused every reduction.
- Track comfort complaints. Note rooms, times and occupants. A schedule that saves energy but causes repeated overrides is too aggressive for that household.
- Change one variable at a time. Adjust setback size, timing or recovery—not all three together—so you can identify what helped.
Troubleshoot common comfort problems
The home is still cold or hot at arrival
Move the recovery start earlier, reduce the setback, and check whether the thermostat is using a sensor in an unrepresentative room. If the system runs continuously without reaching target, investigate airflow, filters, refrigerant, insulation or equipment capacity with a qualified technician rather than widening the setback.
The system runs at maximum output during recovery
On a variable-capacity, multi-stage or heat-pump system, reduce the setback and follow the manufacturer’s recovery guidance. A slower, steadier recovery may use less energy than repeatedly invoking high capacity.
Best Value
- 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]
The thermostat keeps switching to away mode while someone is home
Review which phones and sensors are included, location permissions, sensor placement and the geofence boundary. Disable automatic away behavior until every regular occupancy pattern is represented, then re-enable it with a conservative temperature change.
People override the schedule every day
Treat the overrides as evidence that the time or temperature is wrong. Move the transition closer to actual routines, narrow the temperature difference, or remove that period entirely. The best schedule is the one occupants can live with consistently.
Choosing a smart thermostat and checking rebates
Prioritize compatibility and control quality over a long feature list. Before purchase, verify:
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall- Support for your heat-pump type, heating and cooling stages, zones and auxiliary heat.
- C-wire requirements and whether an approved adapter is available for your installation.
- Reliable scheduling, learning controls, geofencing and occupancy sensing that match your household.
- Compatible room-temperature or occupancy sensors if one room drives comfort.
- How easily someone can make a temporary manual change without destroying the schedule.
- Installation assistance for complex wiring or proprietary equipment.
- Data and privacy controls, including what account, location and occupancy data the software collects.
- Total cost after any location-specific utility rebate or demand-response incentive.
ENERGY STAR provides a Product Finder for certified models. Some utilities sponsor rebates or demand-response programs, but eligibility, enrollment and payment differ by location and can change; confirm the current terms with your utility before counting a rebate in your budget.
A conservative starting plan
For a conventional system with a predictable weekday absence, set the occupied winter target near 68–70°F, schedule a 7–10°F setback after the household leaves for at least eight hours, and start gradual recovery before the first person returns. In cooling season, use the highest comfortable occupied target and apply the same absence principle. After one or two comparable billing periods, inspect runtime, comfort and overrides. Keep the change if comfort remains good; otherwise shorten the setback, reduce its size or change the timing.
For heat pumps, variable-capacity equipment, multi-stage systems or zoned homes, begin with the equipment maker’s recommended setback and recovery behavior instead of assuming the full 7–10°F change is appropriate. The goal is not the largest temperature swing. It is a routine the equipment can recover efficiently and the household will follow without constant manual correction.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems
