The U.S. Department of Energy’s 2010 Guide to Home Heating and Cooling recommends setting the thermostat to 68°F while awake in winter and lowering it while sleeping. Treat that as general guidance, not a universal ideal: the right approach depends on your heating equipment, home, comfort needs, and the thermostat’s compatibility with the system.
Heat pumps are an important exception to ordinary furnace or boiler setback advice. ENERGY STAR recommends choosing a comfortable steady temperature for an air-source heat pump, while DOE advises using heat-pump controls that raise the temperature gradually to help avoid activating inefficient electric resistance heat.
Start With 68°F While You Are Home and Awake
For a general starting point, use 68°F while you are awake and at home, as recommended in DOE’s 2010 guide. Adjust for comfort and safety rather than treating that figure as a rule for every household. If a room feels cold, drafts, insulation, air distribution, and thermostat location may matter as much as the setting.
DOE’s same guide says that setting the thermostat back by 1°F for an eight-hour period can save 1% on heating bills. This is the guide’s rule of thumb, not a guaranteed result for an individual home. Actual energy and bill impacts depend on the equipment, home, weather, and utility rates.
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- 【Notice】Please make sure to read the installation and wiring instructions provided in the pictures carefully before buying. If you are inexperienced with installation, it is advised to be cautious when making a purchase to avoid issues like product failure or incompatibility. (Verify the existing base to ensure only 2 to 5 wires are compatible for installation and wiring).
- 【Thermostat Applications 1H/1C】for with Conventional Single-Stage Heating & Air Conditioning, up to 1 Heat and 1 Cool. Gas/Oil/Electric Furnace (Heat only), Boiler Radiant (Heat only), Furnace Forced-Air (Heat Only), Gas Fireplace (24 Volts), Cooling Only, Only 1H/1C Heat Pump (without aux) Systems.
- 【Incompatible Systems】Does not work multistage systems (1H/2C, 2H/2C), HVAC heat pump systems (2H/1C, 4H/2C), PTACs, 3-wire hydronic (hot water), dual fuel/hybrid heating. Does not work line voltage systems (120-240V electric baseboards heat); mini split heat pump air conditioner, RV air conditioners mach and roughneck series.
- Suuwer S705 5-1-1 day programmable thermostat 1 Heat/ 1 Cool. Separate programs for the weekdays and weekends with 4 program periods per day including wake, leave, return and sleep.
- 【Technical support】 Separate heat or cool swing set up (0.2°F to 2°F) and 5 minute compressor delay protection (Selectable ON or OFF). Digital thermostat has a built-in battery change and filter change reminders (Set 50-2000 hours)
Do not treat the thermostat as the only comfort control in the house. If a room feels cold, possible causes include drafts, cold surfaces, unsealed ducts, missing insulation, or an unbalanced supply register. Raising the thermostat for the whole home may overheat other rooms without addressing the underlying problem.
A Practical Winter Thermostat Schedule
For a conventional furnace or boiler, DOE’s general guidance supports lowering the setting while sleeping or when the home is unoccupied. There is no single setback schedule that suits every home, so use your equipment instructions and household comfort as guides.
| System or situation | General approach | What to keep in mind |
|---|---|---|
| Furnace or boiler, home and awake | 68°F is DOE’s general starting point | DOE published this guidance in its 2010 home heating and cooling guide. |
| Furnace or boiler, sleeping or away | Consider lowering the setting | DOE’s guide recommends a setback; choose a level that remains comfortable and safe for your home. |
| Air-source heat pump | Choose a comfortable steady temperature | ENERGY STAR says heat pumps do not save energy by turning the setting down while away or asleep in the way furnaces or boilers do. |
| Heat-pump recovery or control setup | Use heat-pump-compatible controls and gradual recovery | DOE advises controls designed to avoid unnecessary electric resistance heat; follow the manufacturer’s instructions. |
For a household with an infant, an older adult, a medical condition, or someone who is cold-sensitive, comfort and safety come first. Choose a setting appropriate to the people in the home, and address drafts or cold rooms rather than relying on a universal temperature recommendation.
Heat Pumps Need a Different Winter Strategy
ENERGY STAR’s current air-source heat-pump guidance says to “Stick with a steady temperature” and explains that, unlike a furnace or boiler, a heat pump does not save energy by turning the setting down when you are away or asleep. Equipment and controls vary, so check the manufacturer’s instructions for your model.
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What AUX Heat and Emergency Heat Mean
Auxiliary heat is backup heat that may help a heat pump when it cannot meet the heating demand by itself. Its operation depends on the equipment and controls. If auxiliary heat appears to run frequently, consult the equipment instructions or have a qualified HVAC professional review the system and its settings.
Emergency heat is a separate thermostat mode on systems that provide it. Check the heat-pump and thermostat documentation before using it; do not assume it is the normal setting for everyday heating.
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- 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
Thermostat controls and stages must match the equipment. When replacing a thermostat, verify compatibility with the heat pump and any backup heat, staging, or variable-capacity features. Follow the manufacturer’s recommendations; seek professional help if the system’s wiring or controls are unclear.
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A thermostat measures air temperature at one location. Comfort can also be affected by drafts, cold surfaces, air movement, humidity, and differences between rooms. That is why the same thermostat setting may feel different from one home to another.
Here are some conditions to check when the thermostat setting does not match how a room feels:
- Thermostat location: Keep it away from direct sun, fireplaces, supply registers, exterior doors, and other heat sources that may distort its reading.
- Air sealing: Gaps around attic penetrations, rim joists, plumbing chases, and exterior doors can contribute to drafts.
- Attic insulation: Missing or uneven insulation can contribute to heat loss and uneven comfort.
- Duct leakage: Leaking or disconnected ducts can affect airflow and comfort.
- Filter condition: Follow the equipment maker’s guidance for inspecting and replacing the filter.
- Room balance: Rooms can differ in temperature because of their location, insulation, windows, or airflow.
If the home feels cold, check for obvious drafts, blocked or closed registers, obstructed return grilles, and visible duct problems. If comfort problems continue, a qualified contractor can assess the home and heating system.
How Much Can You Save by Lowering the Thermostat?
Lowering a thermostat can reduce heating use in some situations, but the result varies by home and system. DOE’s 2010 Guide to Home Heating and Cooling gives a rule of thumb of 1% savings on heating bills for each 1°F setback over an eight-hour period. Do not treat that published estimate as a guaranteed household saving.
That general advice should not be applied identically to every heating system. ENERGY STAR advises air-source heat-pump owners to choose a comfortable steady temperature, and DOE recommends gradual recovery using heat-pump-specific controls to help avoid electric resistance heat. Consider your equipment’s instructions and compatibility before changing its schedule.
Smart Thermostats: Useful, But Only If Set Up Correctly
A smart thermostat may offer scheduling, occupancy detection, remote adjustments, or vacation settings. Those features can help manage heating, but they do not make an incompatible thermostat suitable for a particular system or guarantee a specific amount of savings.
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- · High Compatibility: Forced air (gas, oil or electric), Electric furnace, Hot water steam or gravity radiant heat, Heat only systems, Heat pump w/o auxiliary or emergency heat, Millivolt, Gas fireplaces (24V), Floor or wall furnaces, Cool only systems.(TIP: Before purchasing, check to see if this thermostat is compatible with your system.)
- · Not Compatible: Heat pump with auxiliary or emergency heat, Dual fuel/hybrid heating, Electric baseboard heat (110-240 volts), Line voltage, Convectors, Radiant-ceiling heat, Mini split systems and 12V RV systems.
- · Easy to Install and Use: Large terminal blocks with universal sub-base, can be installed within 30 minutes, Large, clear, easy-to-read backlight LCD display and easy controls make for a user-friendly experience.
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Before buying one, verify compatibility with your heating and cooling equipment. ENERGY STAR notes that variable-speed, multi-stage, and zoned systems may need professional installation. Its guidance also says variable-capacity equipment generally performs best with a manufacturer-recommended thermostat.
Use the system maker’s instructions and the thermostat’s compatibility information to choose a device. If the equipment type, wiring, or controls are uncertain, ask an HVAC professional before purchasing or installing a replacement.
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Some smart thermostats require a C-wire, or common wire, for power; requirements vary by model. Check the thermostat maker’s compatibility information and your HVAC system’s documentation before installation. Do not assume wire color alone identifies a wire’s function.
Compatibility matters beyond the power connection. Check whether the thermostat supports your system type and any heat-pump stages, backup heat, zoning, or variable-capacity features. For variable-capacity equipment, ENERGY STAR says the manufacturer-recommended thermostat is generally the best choice.
When to DIY vs When to Hire a Pro
A straightforward thermostat replacement may be manageable for a careful homeowner, but the controls must match the heating system. Variable-speed, multi-stage, and zoned systems may need professional installation, according to ENERGY STAR.
| Project type | DIY may be appropriate when | Consider a professional when |
|---|---|---|
| Like-for-like thermostat replacement | The manufacturer’s instructions are clear and the system is compatible | Wires or terminals are unclear or the equipment does not behave as expected |
| Smart thermostat | The compatibility information confirms support for your system | Wiring or power requirements are uncertain |
| Heat-pump thermostat | You can verify the thermostat supports the heat pump and its controls | Backup heat, multiple stages, zoning, or variable capacity is involved |
| Integrated or specialized controls | The equipment maker explicitly supports the proposed setup | The system uses specialized or communicating equipment |
If you do any thermostat work, follow the equipment and thermostat makers’ safety instructions. Photograph and label existing connections before disconnecting anything, and identify wires by their terminal markings rather than color alone. Stop and get help if the wiring or system behavior is uncertain.
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After installation, check operation using the thermostat and equipment makers’ procedures. Confirm that the thermostat controls the intended heating modes and that the system operates normally.
Rank #4
- Simple Manual Operation: Heagstat H705 1 Heat/1 Cool, 5-1-1Day Programmable Thermostat (Separate programs for the weekdays and weekends with 4 program periods per day including wake, leave, return and sleep). The user-friendly design is easy to operate for people of all ages
- System Compatibility: Works with conventional single-stage systems, including Forced air (gas, oil, or electric) & Ventilation & Air Conditioning. It supports up to 1 heating stage and 1 cooling stage. Please confirm your home HVAC system type before purchase to ensure full compatibility
- System Limitations: This unit does NOT work with multi-stage systems and heat pump systems (2H/1C, 2H/2C, 3H/2C, 4H/2C: Multi-Stage Heating & Cooling), PTAC units (Packaged Terminal Air Conditioners), 3-wire hydronic hot water heating systems, dual fuel/hybrid heating systems, 120-240V line voltage systems and electric baseboard heaters, mini-split heat pump air conditioners, and RV air conditioners (Mach/Roughneck series)
- No C-Wire Required Design: Dual power supply design runs on 24VAC hardwired power or 2 AAA batteries (batteries not included). Equipped with standard RH, RC, W, Y, G and C terminals. Wire Specs: Use 18-22 gauge thermostat wire. Shielded wire is not required. Easy DIY installation without professional help. It does not support W2, Y2, O/B, E, L, AUX, ACC+, ACC-, S, X and X2 terminals
- Clear & Easy-to-Read Display: Minimalist off-white body matches most home interior styles. The 4.5 sq inch backlit LCD screen delivers clear visibility under all lighting conditions. Compact dimension: 0.98 inches D x 4.72 inches W x 3.86 inches H, allowing flexible wall mounting
Safety, Code, and Permit Notes
Thermostat wiring and equipment differ. A mistaken connection can damage controls or cause equipment to operate incorrectly. Follow the manufacturer’s safety instructions, and hire a qualified professional if you are unsure about the wiring or the system.
Local permit requirements and minimum heating requirements vary. Check local rules before changing controls in a rental property, undertaking broader HVAC work, or relying on a low setting during an absence.
Do Not Set the Thermostat Too Low During Freezing Weather
During freezing weather, a thermostat reading does not guarantee that every pipe is protected. Pipes in exterior walls, crawlspaces, garages, or other cold areas may be at risk even when the thermostat reads warmer. Follow local guidance and take the layout and condition of your plumbing into account.
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Before leaving during freezing weather, check that the heating system is operating and address known drafts or vulnerable pipes. If the home has a history of frozen pipes, do not rely on a thermostat setting alone; consult a qualified professional about appropriate protection.
For a second home, rental, or vacant property, consider monitoring indoor temperature and arranging for someone to check the property during cold weather. Make sure the heating system and controls are suitable for the property and follow the system maker’s instructions.
Our Builder’s Recommendation
For a general winter starting point, DOE’s 2010 guide recommends 68°F while awake and a lower setting while sleeping. For an air-source heat pump, ENERGY STAR recommends a comfortable steady temperature; DOE advises heat-pump controls that raise the temperature gradually to help avoid electric resistance heat.
If a room feels uncomfortable, do not focus only on the number. Check for drafts, insulation or duct issues, airflow problems, and thermostat placement. For sizing, heat-pump performance in cold conditions, or thermostat compatibility, consult the equipment maker or a qualified HVAC contractor.
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- 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.
The best setting is the one that keeps the household comfortable and safe while following the guidance for the installed equipment. DOE’s 68°F recommendation is a useful general starting point, not a promise that the same setting or schedule is right for every home.
FAQ
What should I set my thermostat to in the winter?
DOE’s 2010 Guide to Home Heating and Cooling recommends 68°F while awake and lowering the setting while sleeping. Treat that as general guidance and adjust for comfort, safety, and your equipment.
Should I turn down my heat pump at night?
ENERGY STAR recommends choosing a comfortable steady temperature for an air-source heat pump, noting that heat pumps do not save energy by turning the setting down while asleep or away in the way furnaces or boilers do. Follow your heat-pump maker’s instructions.
Can lowering the thermostat save money?
DOE’s 2010 guide estimates 1% savings on heating bills for each 1°F setback over an eight-hour period. That is a published rule of thumb, not a guaranteed saving for every home or heating system.
Why does DOE recommend gradual heat-pump recovery?
DOE says heat-pump thermostats should ramp the temperature up slowly to help avoid activating electric resistance heating elements, which it describes as inefficient. The right controls and settings depend on the equipment.
How do I know if a smart thermostat will work with my system?
Check the thermostat maker’s compatibility information against your system and its controls. ENERGY STAR notes that variable-speed, multi-stage, and zoned systems may need professional installation, and variable-capacity equipment generally performs best with a manufacturer-recommended thermostat.
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