Key Takeaways
- Program your daytime winter temps to approximately 68°F to 70°F and summer home temps to approximately 78°F. Let 7°F to 10°F setbacks when away or asleep reduce energy consumption without compromising comfort levels.
- Use programmable or smart thermostats to schedule 7°F to 10°F setbacks for at least 8 hours per day and automate changes to prevent expensive manual override adjustments.
- Combine thermostat strategy with home efficiency — sealing leaks, insulation, and HVAC maintenance — to hold that temperature and reduce system workload.
- Consider your heating system when choosing settings and behavior. Keep steady settings for heat pumps and radiant systems. Avoid rapid swings that cause furnaces and other systems to work harder.
- Position thermostats away from sunlight, drafts, and heat sources. Utilize remote sensors where necessary to help maintain accurate readings and even comfort throughout rooms.
- Train the family on thermostat consistency, promote layering or fans for light comfort needs, and compare energy bills pre and post change to calculate actual savings.
What is the best thermostat setting for energy savings?
For heating, try to be close to 66°F while home and awake and 60°F during the night or when out.
For cooling, set around 75°F when home and increase by 5°F to 7°F when empty.
The best programmable or smart thermostat cuts waste by following schedules and learning patterns.
They detail easy actions and actual savings figures.
Optimal Settings
Good thermostat settings are a balancing act between comfort, equipment constraints, and energy efficiency. The trick is to select consistent, research-driven targets and automate setbacks such that the system cycles less while residents remain comfortable. Here are some real-world, season-centric settings and habits connected with quantifiable savings and everyday life.
1. During Summer
Try to keep the AC at around 78°F when you’re home. That tends to be the most efficient cooling point and aligns with studies proposing 78°F as the ideal “summer.” For example, turn the thermostat up by 7 to 10°F during the day while you’re away and at night while you’re sleeping. A setback this size for at least eight hours can reduce energy consumption by about 10% annually.
Take advantage of ceiling fans to circulate air and give your space a cool breeze, allowing you to keep your thermostat at a higher setting without sacrificing comfort. Avoid frequent adjustments. Large or repeated drops on the thermostat make the AC run longer and reduce efficiency.
Keep in mind the AC can only cool to roughly 15°F to 20°F less than outdoor temperature, so setting it too low is not only futile but energy-wasting.
2. During Winter
Set your thermostat to around 68°F during the day when you’re home. That is the standard energy-saving guideline for heating. Turn it down 7°F to 10°F at night or when you’re away, with most recommending 60°F to 65°F for sleeping or being away.
The lower the internal temperature, the slower heat escapes the building and the less fuel is used. Don’t let the temperature exhibit wide, abrupt swings. The heater works harder to recover and consumes more than steady, modest setbacks.
Instead, schedule gentle ramps in temperature so the system increases heat gradually prior to occupancy, which minimizes heat loss and maintains comfort.
3. While Away
Setbacks of 7°F to 10°F for at least eight hours generate significant savings in both winter and summer. Use programmable or smart thermostats to automate these temperature adjustments for workdays, weekend getaways, and vacations.
Consider pets and plants: choose away temperatures that avoid harm, with slightly narrower setbacks if animals are alone or plants are sensitive. Preferably set the HVAC to return to a comfortable temperature just before you come home so the house is prepped without extended recovery runs.
4. While Sleeping
Turning your thermostat down 7°F to 10°F at night will not only help you sleep, but will save you energy. I tend to think that most people are comfortable at 60°F to 65°F with season-appropriate blankets.
Schedule nightly setbacks into your smart thermostat for hands-off savings that recur. Don’t overheat bedrooms. Cooler rooms commonly facilitate sleep and reduce heating requirements.
Beyond Numbers
This perspective contextualizes thermostat setpoints into the bigger picture of home performance. Degrees alone won’t provide the best savings. Insulation, air sealing, system maintenance, and occupant behavior all mold how effective a given setpoint will be.
Begin by reconceiving the thermostat as one lever in a more extensive system, including building fabric, ventilation, and daily habits.
The Setback Strategy
Use 7°F to 10°F setbacks for 8 or more hours a day to reduce annual heating and cooling expenses. For instance, dropping from 68°F to around 57°F to 58°F overnight or while working delivers notable savings with no discomfort on the system.
Use programmable or smart thermostats to operate these setbacks automatically on weekdays and weekends. Trace your energy bills for at least a few months before and after to witness actual savings because tiny seasonal samples can deceive.
Try not to micromanage this too often. All these constant changes confuse the schedule and can actually cancel out savings because the HVAC has to expend additional energy getting back to setpoint. Extreme temperature swings are not advised; they suck and waste energy.
With fans, you can bump the thermostat 3°F to 4°F and still maintain comfort, so pair fan use with a slightly elevated cooling setpoint.
The Comfort Zone
Determine your family’s comfort zone on the thermostat. Most of us feel comfortable living day-to-day somewhere around 68°F to 72°F. The oft-referenced 68°F winter goal serves as a recommendation, not a mandate — individual requirements differ.
Make changes in small increments so that your occupants can get used to them without too much discomfort. It’s not just about the numbers. Humidity control does its part too. When the humidity is low, people feel cooler, so you can set a higher cooling temperature.
- Parent: prefers 70°F evenings for sleep.
- Remote worker: keeps 68°F daytime for long sits.
- Child: needs slightly warmer bedroom at night, 72°F.
- Elderly family member: prefers 73°F during the day.
Setting too low in summer or too high in winter compels the unit to operate without increased comfort. Stick to moderate setpoint shifts and combine them with layers or fans.
The Human Factor
Personal heat preferences need small adjustments for domestic peace. Teach your family about default settings and why constantly changing them is expensive. Promote layers, blankets, or portable fans for immediate relief rather than shifting the thermostat.
Establish simple rules: use the programmed schedule, allow one degree of temporary change, and log manual overrides if needed.
Simple Energy Audit: Look for sneaky leaks, rate your insulation, and check your HVAC system. Just a little bit of regular maintenance can save you up to ten percent a year in efficiency losses.
Make a checklist of sealing gaps, upgrading attic insulation, servicing systems, and adding programmable controls.
System Impact
Each heating system responds differently to thermostat adjustments. Knowing those differences helps reduce energy consumption and avoid needless wear. The subsections below describe how furnaces, heat pumps, and radiant systems operate, how to configure thermostats for each, maintenance considerations, and trade-offs. A table compares common reactions to thermostat adjustments.
Furnaces
Slow temperature changes save your furnaces from short cycling and loss of efficiency. Quick hops cause constant on and off cycles, which wear parts and burn more gas. Setbacks of 5°F to 9°F over a few hours work better than big, sudden drops.
Programmable thermostats assist in staging these changes mechanically, generating the 10 to 15 percent yearly savings that research studies report. Filters matter. Clogged filters restrict airflow and cause the furnace to run longer, increasing energy consumption and creating inconsistent temperatures throughout the rooms.
Pros and cons of incremental and step changes are outlined below.
| Change style | Pros | Cons |
|---|---|---|
| Gradual (small steps over hours) | Less cycling; better efficiency; lower wear | Slower comfort recovery |
| Abrupt (large immediate change) | Faster comfort | Higher energy use; more cycling; shorter equipment life |
Install a programmable thermostat and maintain clean furnace filters to maintain steady airflow and precise temperatures. Every degree changed can save you about three percent, so the combination of minor setbacks and clean filters gives you consistent savings.
Heat Pumps
Heat pumps operate most efficiently on consistent settings. These frequent temperature swings can make the system call for the auxiliary or emergency heat, which consumes significantly more electricity. Set a reasonable target temperature and let it run to keep heat pump compressors in their sweet spot.
Smart thermostats designed for heat pumps are able to handle this and reduce bills by 10 to 20 percent. Minimize or eliminate emergency heat mode unless the heat pump is unable to provide required heat. Emergency heat uses resistive elements and spikes energy use.
Program thermostat schedules around usage patterns so the unit runs steady while occupied and drops off when unoccupied, preserving compressor life and saving money. Just a couple of checklist items, regular checks of refrigerant level and outdoor unit clearance, keep the system efficient and stave off costly peak-season breakdowns.
Radiant Heat
Radiant systems heat mass—floors and walls—gradually and uniformly. Keep a steady set point to leverage that thermal inertia. Rapid raises waste heat since the system has to warm the mass over and over. System impact from slow, timed starts achieves comfort with less energy.
Schedule radiant systems to begin heating rooms prior to occupancy instead of taking large adjustments at start time. Insulate your subfloors and any rooms served by radiant heat to minimize loss and increase responsiveness.
If you dial down thermostats a few degrees throughout the season, aggregate savings increase and system strain decreases.
Placement Matters
Placement of a thermostat matters because where you mount it impacts how it reads and controls your home temperature. When your thermostat’s placement is just right, it provides more accurate data to your HVAC system, which reduces unnecessary cycling and can save energy and money.
Place thermostats out of direct sun, drafts, and away from heating registers. Sunlight shining on the thermostat will heat its case and cause the sensor to read warmer than the room really is. This can cause the system to cool when it is not required or run longer in winter.
Placement is important. Keep the unit off walls that get strong sun any time of day and away from lamps, ovens, radiators, and appliances that generate heat. Drafts from outside doors or bad seals on windows will provide inaccurate low reports. Even on chilly winter days, a sunlit thermostat can generate these phony high numbers, so avoid those areas.
Location is important. Install thermostats in a central location to represent the average home temperature. Mounting the thermostat near the geometric center of living areas ensures it represents the whole home, not just one hot or cold corner.
For most homes, the first floor is a good bet since warmth rises and the first floor contains the primary rooms in many homes. Placement counts, particularly when the unit is positioned near the center of the home, where it maximizes accuracy and heating and cooling cycle coverage.
Target an inside wall roughly 50 to 60 inches (approximately 120 to 150 cm) from the floor. This height avoids floor chill and ceiling heat as well as fitting standard sensor design.
For example, don’t put thermostats near windows or exterior doors because they’ll get false readings and cause your HVAC system to cycle unnecessarily. Exterior walls can skew readings when wind or sunshine hits the wall surface.
Don’t place the thermostat too close to supply or return vents. A nearby vent can trick the thermostat into thinking the room is warmer or cooler than it actually is, triggering short cycling and inefficiency. A unit in a weird place can produce “ghost readings” that diminish HVAC efficiency and might cost hundreds to waste every year.
Utilize external room sensors for smart thermostats to optimize temperature in primary living spaces. With external sensors located in bedrooms, living rooms, or upstairs zones, the thermostat can average conditions or prioritize occupied rooms.
This is helpful in multi-floor houses where a single thermostat cannot account for vertical temperature variations. Sensors can be scheduled or occupancy-based, increasing comfort while maintaining the perfect winter setpoint of around 68°F when home and a lower temperature of around 60°F to 65°F during sleep or absence.
Common Myths
A lot of the long-standing beliefs about thermostat behavior are more tradition than thermodynamics. Knowing what an HVAC system really does keeps you from wasting energy and comfort. These points dispel the most common myths and demonstrate what to do instead.
It’s a myth that turning the thermostat down or up to make the house cool or warm faster actually works. The system circulates air and refrigerant at a given speed. It cannot operate any faster because you chose a lower or higher setting. If you set the cooling point several degrees lower, the compressor and fans run the same way until the target is reached, so you just use more energy.
Case in point, turning the thermostat down to 64°F instead of 72°F won’t cool faster. It’ll just run longer and be more expensive.
Keeping the thermostat at one temperature all day isn’t always best. A constant setpoint can be effective in ultra-insulated houses with heat recovery, but in the majority of buildings allowing the temperature to float when empty is energy efficient. Smart or programmable thermostats cut consumption by dropping heating or bumping cooling setpoints during work hours.
Many people defeat this benefit: up to half of programmable thermostats are placed on permanent hold and never run their schedules. Utilize a schedule that fits your occupancy or a smart thermostat that learns, and don’t leave it stuck unless your home and lifestyle align with that strategy.
Here are some myths, like closing vents in your guest room because you ‘never use it.’ Blocking airflow increases pressure in ductwork, unbalances the system, and causes the fan and compressor to labor more. In certain configurations, this can cause duct leaks or uneven, expensive cooling.
If a room is rarely used, turn down output at the thermostat or with dampers specific to the system instead of just closing vents.
It’s a myth that habitually tweaking your thermostat makes you more comfortable and saves you money. Each change causes the system to cycle to the new setpoint. Tiny, incremental adjustments result in short cycling or extended runs and decreased efficiency.
Use a reasonable range and a schedule or a single change that you retain until the house stabilizes.
Additional clarifications: Fans do not reduce air temperature but make people feel cooler by evaporating sweat. Turning ceiling fans back in winter pushes warm air down. A bigger AC unit may short-cycle and not dehumidify well, so sizing counts.
Myth #1: Turning off your AC when you’re away saves energy. It does in some climates, but can actually use excess energy to re-cool in humid areas, so use setbacks wisely!
Smart Automation
Smart thermostats and home systems remove default thermostat adjustments from your control and maintain indoor temperatures efficiently without the need to think about it every day. Buy a smart thermostat that figures out when you wake up, leave, and go to sleep. It will save several new settings a day and repeat them effortlessly.
These can learn patterns over days or weeks and set back or raise temperatures to occupancy, so heating and cooling only run when necessary. That helps keep the house comfortable and reduces waste.
Use smart automation to adjust settings remotely. Connect your thermostat to a phone app, voice assistant, or home hub so you can adjust temperature from a distance. If a meeting runs late or travel plans shift, a fast remote update stops energy consumption while you’re gone.
Some systems allow you to set rules, for example, turning off zones when windows are open or lowering the set point at night, cutting down manual steps and aiding with maintaining savings.
Review energy saving reports from your thermostat to identify new opportunities to save. Most smart thermostats have daily and monthly energy reports, including runtime and peaks. Look for patterns such as long runtime during certain hours, short cycling, or steady draws while no one is home.
Utilize those reports to adjust schedules, alter setback amounts, or verify HVAC servicing. For instance, viewing high evening use could indicate the home requires additional insulation or that setback during afternoon hours could be heightened.
Turn on geofencing to automate location-based changes. Geofencing uses your phone to put the system in away mode when everyone leaves and back to comfort mode when phones return. It can kick on cooling or heating before you get there, so your home is comfortable inside without having to run the system all day.
Set the return trigger to start conditioning 15 to 30 minutes before arrival for most houses, though more time is needed for larger houses. Geofencing works well for erratic schedules and minimizes the possibility that you neglect to adjust the thermostat.
Smart automation will reduce energy use by lowering temperatures when you are sleeping or away, and it can save as much as around 10% annually on heating and cooling bills if you set back 7°F to 10°F for approximately eight hours per day.
Combine the thermostat with other smart components, such as motion sensors, door locks, or vents, to establish a system that responds to actual activity rather than predetermined schedules, increasing both comfort and efficiency.
Conclusion
Even better, lower your thermostat a few degrees in winter and raise it in summer that cuts energy use and trims bills. Typical: Recommended for daytime heat near 66°F to 68°F and night near 60°F to 63°F. For cooling, shoot for around 75°F to 78°F when you’re home and slightly higher when you’re not. Use a programmable or smart thermostat to suit your routine. Mount your thermostat on an inside wall, away from sunlight, drafts and interference from appliances. Seal leaks, insulate, and keep vents open to make the system run less. Small steps add up: a 1°F to 2°F shift can cut energy use by about 1 to 3 percent. Experiment with one change for a month, monitor the bill, and tweak it. Will you give one setting a try this week? Try a 1°F to 2°F adjustment and see what happens.
Frequently Asked Questions
What thermostat temperature saves the most energy in winter?
Set your thermostat to around 66°F to 68°F while home. Turning it down 5°F to 7°F for eight hours a day saves a lot of energy and cuts bills without losing comfort.
What is the best summer setting for energy savings?
Bonus: Best thermostat setting for energy savings. Increase the temperature 5°F to 7°F when you’re out, saving energy and money without overburdening your HVAC system.
Should I turn the thermostat off when I leave?
No. Use setback settings instead. Programmable or smart thermostats lower temperatures while you’re not home, conserving energy and they aren’t stressed by big, sudden changes.
Do smart thermostats actually save energy?
Yes. Smart thermostats can learn your patterns, optimize schedules, and take advantage of geofencing or sensors. Research found typical household savings of 10 to 15 percent for heat and 5 to 10 percent for cooling when used properly.
How much does changing the thermostat by 1°F save?
A change of 1°F generally produces 1 to 3 percent savings. Your specific savings depend on your climate, how well insulated your home is, and how efficient your HVAC system is, but small changes really do add up.
Where should I place my thermostat for accurate readings?
Put it on an inside wall out of direct sunlight and away from drafts, doors, and heat sources. Correct location keeps away false readings and enhances comfort and energy savings.
Are programmable thermostats better than manual ones?
Yes. Programmable and smart thermostats eliminate the need for manual setbacks, eradicating human error and ensuring consistent efficiency. They provide tangible savings and more consistent comfort than manual controls.