As the summer heat sets in, many homeowners struggle to find the right thermostat setting to balance comfort and energy efficiency. Air conditioners can account for nearly half of a household’s energy bill during peak summer months, so using the right settings can make a noticeable difference in cooling costs. The U.S. Department of Energy (DOE) estimates you can save up to 10% annually on energy bills by simply adjusting your thermostat by 7–10°F for eight hours a day from its normal setting.
But what exactly is the best thermostat setting for summer? The answer isn’t as straightforward as picking one number. It depends on whether you’re home or away, sleeping or awake, and your home’s unique characteristics. This guide explains recommended thermostat settings for different times of day, how humidity affects comfort, and tips for maximizing energy savings without sacrificing your comfort level.
Why Summer Thermostat Settings Matter for Comfort and Energy Savings
Finding the best thermostat setting for summer isn’t just about comfort; it’s about energy efficiency and reducing energy consumption. Setting your air conditioner too low can drive up cooling costs significantly, while setting it too high can leave your house feeling uncomfortably warm.
Air conditioning systems work best when the thermostat is set at a consistent, moderate temperature. Constantly changing the settings forces your HVAC system to work harder, using more energy and wearing down components prematurely. Every degree you lower your thermostat below 78°F can increase energy costs by as much as 3–5%, according to the DOE.
Maintaining proper temperature settings can also help regulate your home’s relative humidity. High humidity can make the same temperature feel much warmer because excess moisture prevents your body from cooling itself effectively through sweat evaporation. Keeping your thermostat at a moderate setting while using strategies like ceiling fans and vapor barriers can make your home feel cooler without excessive energy consumption.
Recommended Thermostat Settings for Summer: Home, Away, and Night
The DOE and Energy Star recommend keeping your thermostat set at 78°F while you’re home during summer months for a good balance between comfort and energy savings. However, the right temperature also depends on when you’re home, how well your home is insulated, and your family’s comfort preferences.
When you’re away for more than eight hours, increasing your thermostat setting by 7–10°F above your normal setting can reduce cooling costs by up to 10% per year. This allows your air conditioning system to run less frequently, saving energy and lowering your electric bill. At night, many people prefer cooler air for better sleep quality. You can set your thermostat 3–4°F lower than your daytime setting if you want additional comfort while you sleep.
Here’s a simple breakdown of recommended thermostat settings for summer:
| Situation | Recommended Setting | Why It Works |
|---|---|---|
| Home (Daytime) | 78°F | Balances comfort and energy efficiency |
| Away (8+ hours) | 85°F | Reduces energy consumption and cooling costs |
| Sleeping | 74°F (optional) | Provides a comfortable temperature for better sleep quality |
Homes with pets, infants, or elderly family members may need slight adjustments for health and safety. Also, consider that homes with ductless mini-splits or smart thermostats can program different temperatures for different rooms, which can further improve comfort without wasting energy.
How Humidity and HVAC System Type Affect Thermostat Settings
Humidity plays a major role in how warm or cool your home feels. High humidity can make the same temperature feel warmer, leading you to lower the thermostat unnecessarily. If your home is in a region with high summer humidity, a setting around 78°F may feel warmer than expected. Using a dehumidifier or running your air conditioning’s built-in dehumidification mode can help balance moisture levels and allow you to maintain a comfortable temperature without increasing energy consumption.
The type of HVAC system you have also influences the ideal thermostat settings. Central air conditioning systems and heat pumps operate most efficiently with consistent temperature settings. Ductless mini split systems offer more flexibility because they allow you to control temperatures in individual rooms. This can make it easier to maintain comfort in commonly used areas without cooling unused rooms unnecessarily.
Thermostat placement also matters. If your thermostat is on an exterior wall or in direct sunlight, it may register a higher temperature than the rest of the house, causing your air conditioner to run longer than needed. Consider relocating your thermostat or using a smart thermostat with remote sensors to get more accurate readings.
Tips for Maximizing Energy Efficiency Beyond Thermostat Settings
While setting your thermostat correctly is important, there are additional steps you can take to reduce cooling costs during summer. These strategies can help maintain a comfortable temperature without constantly lowering your thermostat.
One of the simplest ways to feel cooler without using more energy is to use ceiling fans. A fan set to rotate counterclockwise creates a wind-chill effect that can make you feel up to 4°F cooler, allowing you to set the thermostat higher without sacrificing comfort. Another effective method is to keep blinds or curtains closed during the hottest parts of the day to block heat from the sun.
To further enhance efficiency:
- Perform regular HVAC maintenance. Clean or replace air filters every 30–90 days and schedule annual tune-ups to keep your system running efficiently.
- Seal air leaks and improve insulation. Gaps around windows, doors, and ducts can cause cool air to escape, forcing your HVAC system to work harder.
- Avoid large temperature swings. Contrary to popular belief, lowering the thermostat drastically will not cool your house faster; it will only increase energy use.
- Cook outdoors when possible. Using the oven or stove during the day can raise your home’s temperature and make your air conditioner run longer.
The Role of Programmable and Smart Thermostats in Summer Energy Savings
Programmable and smart thermostats are excellent tools for maintaining the best thermostat setting for summer. They automatically adjust temperature settings based on your schedule, reducing energy costs without you having to remember to make manual changes.
Energy Star reports that homeowners can save an average of 8% annually on heating and cooling bills by using a smart thermostat. These devices learn your habits, adjust to local weather patterns, and even detect when you’re away from home. Many smart thermostats also provide energy usage reports, helping you understand how your habits affect energy costs.
Key features to look for in a smart thermostat include:
- Geofencing: Automatically adjusts settings when you leave or return home.
- Humidity control: Balances moisture levels for greater comfort at higher temperatures.
- Remote access: Lets you change temperature settings from your smartphone.
- Energy tracking: Provides insights into energy consumption to help you save money.
Should You Adjust Your Thermostat Differently at Night?
Nighttime thermostat settings depend on your comfort preferences and sleep habits. Many people prefer cooler temperatures for sleeping, which can lead to a better night’s rest. Setting your thermostat about 3–4°F lower than your daytime setting can improve sleep quality without drastically increasing energy costs.
If you find it difficult to stay comfortable at night, consider using lighter bedding, a ceiling fan, or running your air conditioning on a schedule that cools the house slightly before bedtime. These approaches allow you to enjoy a comfortable temperature without leaving the thermostat set at a low temperature all night.
Common Mistakes to Avoid When Setting Your Thermostat in Summer
Even with the best intentions, many homeowners make mistakes that lead to higher energy costs and reduced comfort. Understanding these common errors can help you get the most out of your thermostat settings.
One mistake is setting the thermostat too low when you first get home. Air conditioners cool at a steady rate, so lowering the temperature drastically won’t cool your house faster; it will just make the system run longer. Another mistake is constantly adjusting the thermostat, which can make your HVAC system work harder and less efficiently.
Additionally, leaving the fan set to “on” instead of “auto” can increase energy costs and humidity. In the “on” setting, the fan runs continuously even when the air conditioner isn’t actively cooling, which can reintroduce moisture into the air. Regular maintenance and using consistent temperature settings can help avoid these issues.
Conclusion
Finding the best thermostat setting for summer requires balancing comfort, health, and energy efficiency. By using consistent settings, leveraging programmable or smart thermostats, and adopting energy-saving habits, you can reduce cooling costs without sacrificing comfort. Small adjustments add up over time, making your home more efficient and comfortable during the hottest months.
Ready to Lower Your Summer Energy Bills? Keep Cool Heating & Cooling helps homeowners in Brookfield, Danbury, and nearby Connecticut towns stay comfortable while saving energy. Our certified technicians can help you optimize your thermostat settings or install energy-efficient smart thermostats that automatically adjust for comfort and savings. Contact us today to schedule your appointment and take control of your home’s comfort.
FAQs
Is 72 too cold for AC in summer?
While 72°F may feel comfortable, it is generally lower than the recommended thermostat setting for summer and can lead to higher energy bills. The DOE suggests 78°F as the ideal temperature when you’re home. Lower temperatures can increase energy consumption and place more strain on your HVAC system.
What is the normal thermostat for summer?
The normal thermostat setting for summer is typically around 78°F when you’re home. When you’re away for several hours, you can raise the temperature by 7–10°F to save energy. This strategy can reduce cooling costs without affecting comfort when you return home.
Is 74 a good temperature for summer?
Yes, 74°F is a comfortable temperature for many households, especially at night or for those who prefer cooler conditions. However, keeping the thermostat at 78°F when home during the day will usually provide better energy efficiency and cost savings.
What is the healthiest temperature to keep your house in the summer?
The healthiest temperature depends on individual needs, but maintaining indoor temperatures between 74–78°F can provide a comfortable and safe environment for most people. Homes with infants, elderly residents, or those with health conditions should avoid extreme settings to maintain proper body temperature and humidity levels.
