How to Choose the Best AC Temperature in Summer

On a humid summer afternoon in Edwardsville, your thermostat can quickly become a source of second-guessing. You may wonder if lowering the temperature will make your home more comfortable or just cause your energy bill to rise. It is a common summer concern for many homeowners. There is no single perfect AC setting that works for every house. The right temperature depends on your comfort preferences, cooling costs, indoor humidity, and whether you are home, away, or sleeping.

Summers in Edwardsville, IL can feel hot and damp, with daytime highs often reaching the upper 80s and 90s. That mix of heat and humidity keeps your cooling system working hard throughout the season. Because of this, even small changes to your thermostat can affect both comfort and energy use over time. B & W Heating & Cooling helps Edwardsville residents choose AC settings that keep homes comfortable without putting unnecessary stress on the system. The goal is not to sit in an overheated house just to save money. The goal is to find a setting that supports comfort while helping your AC run efficiently.

This article explains recommended summer thermostat settings for different times of the day. It covers the main starting point, how much to raise the temperature when you are away, why nighttime settings may need to be different, and how humidity affects indoor comfort. By the end, you will have a practical thermostat plan that you can adjust based on your home and personal comfort.

Finding the Right Summer AC Setting

There is no one temperature that fits every home, but there are dependable guidelines that work well as a starting point. The sections below explain the recommended settings and the factors that may help you decide whether to move the temperature up or down.

1. Start With 78°F When You're Home

The U.S. Department of Energy recommends setting your thermostat to 78°F in summer when you are home and awake. For many households, this setting offers a reasonable balance between comfort and energy efficiency. It keeps your living space cool enough for daily use while reducing how much your air conditioner has to run.

Some homeowners may think 78°F sounds too warm, especially during sticky Edwardsville weather. However, this setting can feel comfortable when air circulation is good. Ceiling fans and steady airflow help your body feel cooler because moving air supports evaporation from your skin. If 78°F feels warm at first, try using fans and lowering the thermostat gradually rather than making a big temperature drop all at once.

2. Understand Why a Higher Setting Saves So Much

A higher thermostat setting helps reduce cooling costs because the AC has less work to do. Each degree above 72°F can reduce cooling expenses by roughly 3 percent. When the indoor temperature setting is closer to the outdoor temperature, your cooling system can reach the target more easily and cycle less often.

This is why 78°F can make a noticeable difference compared with 72°F during a long Edwardsville summer. At the higher setting, the system can satisfy the thermostat sooner and shut off more quickly. Over weeks and months of regular cooling, those shorter run times can lead to meaningful savings on your utility bill.

3. Set It Back 7 to 10 Degrees When You're Away

When the house is empty, it does not need to stay as cool as it does when people are inside. Raising the thermostat 7 to 10 degrees above your normal comfort setting for about eight hours a day can save as much as 10 percent a year on cooling costs. It is a simple way to use less energy without changing how comfortable the house feels while you are actually there.

Still, the away setting should not be pushed too high. It is best to keep the thermostat below 80 to 85 degrees so the air conditioner still runs enough to remove moisture from the air. During humid Edwardsville summers, this matters because humidity can quickly affect comfort. A qualified HVAC professional  can check whether your system is still controlling moisture properly when you use a warmer away setting.

4. Adjust the Setting Overnight for Sleep

Your daytime thermostat setting may not be the best choice for sleep. Many people rest better in a slightly cooler room, often between 72 and 75 degrees. Because your body naturally cools down while you sleep, a cooler bedroom can make it easier to stay comfortable through the night.

If saving energy overnight is your main priority, the Department of Energy suggests setting the thermostat about four degrees above your daytime baseline while sleeping. The right overnight temperature depends on your bedding, airflow, and personal comfort. A programmable thermostat can make this easier by changing the temperature automatically each night.

5. Let Ceiling Fans Do Part of the Work

Ceiling fans do not actually reduce the air temperature, but they do help people feel cooler. This makes it possible to keep your thermostat a little higher while still staying comfortable. In a room where someone is present, a ceiling fan can make 78 feel closer to 74.

Fans should only run in rooms people are using. They cool people, not empty spaces, so leaving them on when no one is there only wastes electricity. Pairing ceiling fans with a moderate thermostat setting is one of the easiest ways to improve comfort during an Edwardsville summer. B & W Heating & Cooling often recommends this simple step before homeowners consider larger changes to their AC system.

6. Keep Humidity in Mind

In a muggy climate, comfort depends on more than the number shown on the thermostat. Humidity can make the air feel warmer, heavier, and less comfortable. Your air conditioner removes moisture while it cools, so the system needs to run often enough to keep indoor air from feeling damp.

This is why the away temperature should not be set too high. If the AC barely runs, moisture can build up inside the home. When you return, the house may feel sticky and may take longer to cool back down. Edwardsville summers often bring plenty of humidity, so your thermostat setting should help manage both temperature and moisture.

7. Use a Programmable or Smart Thermostat

A programmable or smart thermostat makes it easier to manage different settings for home, away, and sleep. Instead of changing the thermostat manually throughout the day, you can create a schedule that adjusts automatically. This helps you save energy while the home is empty and still return to a comfortable indoor temperature.

Smart thermostats add even more flexibility. Many models allow you to adjust the temperature from your phone, and some can learn your daily routine over time. If your schedule changes or a heat wave moves through Edwardsville, you can update your settings quickly. This makes your summer cooling plan easier to follow without constant manual adjustments.

8. Adjust to Your Own Comfort

Recommended thermostat settings are useful, but they are only starting points. Your ideal temperature depends on your comfort level, humidity, insulation, airflow, sun exposure, window quality, and AC performance. A well-insulated home may stay comfortable at a higher setting because it holds cool air more effectively.

The best approach is to start near the recommended range and adjust slowly. Move the thermostat by one or two degrees at a time and give your body a few days to adapt before deciding the setting is too warm. B & W Heating & Cooling can also inspect your system and insulation to see whether your home can maintain your preferred settings during an Edwardsville summer.

Why Edwardsville Residents Choose B & W Heating & Cooling

Residents across Edwardsville rely on B & W Heating & Cooling for practical guidance on running their cooling systems efficiently through a humid Midwest summer. The company looks at how a system actually performs in local conditions, including how it manages both temperature and moisture. That local perspective helps you choose settings that hold up through an Edwardsville July.

The service strengths that Edwardsville residents point to most often include:

● Clear advice on thermostat settings for humid summer conditions
● Attention to humidity control, not just temperature
● Honest assessment of system efficiency and sizing
● Thermostat setup and programming guidance
● Familiarity with the demands of the Edwardsville climate
● Practical tips that lower cooling costs without sacrificing comfort

Many residents read customer feedback before scheduling service. You can review past experiences on the B & W Heating & Cooling page on Yelp, where customers describe the work they received. The company also stays connected with the community through its Facebook page, its  YouTube channel,, and its Pinterest profile, where seasonal tips and service updates are shared throughout the year.

Local Air Conditioning Service Across Edwardsville

B & W Heating & Cooling serves homes and businesses throughout Edwardsville, IL, operating from Blackburn Road within the city. Coverage reaches the historic districts near downtown as well as the newer subdivisions spread across the area.

● Downtown / Main Street: B & W Heating & Cooling provides cooling service and thermostat guidance for the historic brick storefronts and homes near Main Street.
● Leclaire: B & W Heating & Cooling services cooling systems for the homes in the historic Leclaire Village district on the National Register of Historic Places.
● Governor's Way: B & W Heating & Cooling offers efficiency checks for the homes throughout the Governor's Way subdivision.
● Hearthstone Place: B & W Heating & Cooling handles AC repair and tune-ups for households in the Hearthstone Place neighborhood.
● Hidden Acre Estates: B & W Heating & Cooling provides seasonal service for the homes across Hidden Acre Estates.
● SIUE area: B & W Heating & Cooling supports homes and rental properties near Southern Illinois University Edwardsville.
● Watershed Nature Center area: B & W Heating & Cooling serves neighborhoods near the Watershed Nature Center and the surrounding parks.

Driving Directions to Reach B & W Heating & Cooling

B & W Heating & Cooling operates from Blackburn Road in Edwardsville, IL, a base that keeps the team within reach of neighborhoods across the city. The routes below show how to reach the company from several nearby Edwardsville businesses.

Driving directions from Hoffmann Brothers to B & W Heating & Cooling

• Start at Hoffmann Brothers on University Drive in Edwardsville, IL.

• Head east toward the central Edwardsville area using local connecting roads.

• Continue toward the Blackburn Road area on the east side of the city.

• Arrive at B & W Heating & Cooling, where the team provides cooling service and thermostat guidance.

Driving directions from Heritage Heating & Cooling to B & W Heating & Cooling

• Start at Heritage Heating & Cooling on East Park Street in Edwardsville, IL.

• Travel east toward the Blackburn Road area using local roads.

• Follow connecting streets toward the east side of Edwardsville.

• Reach B & W Heating & Cooling, where the team handles cooling repair and humidity control service.

Driving directions from Classic Aire Care to B & W Heating & Cooling

• Start at Classic Aire Care on Sunset Hills Executive Drive in Edwardsville, IL.

• Head northeast toward the central Edwardsville area using local connecting roads.

• Continue toward the Blackburn Road area on the east side of the city.

• Arrive at B & W Heating & Cooling, where the team provides cooling diagnostics and thermostat setup.

Final Thoughts

A practical summer thermostat plan begins with 78°F while you are home, a 7 to 10 degree setback when you leave, and a nighttime setting that helps you sleep comfortably. Each degree above 72 can help lower cooling costs, while a moderate away setting can save energy without allowing the home to feel damp. In Edwardsville, humidity control is just as important as the thermostat number.

From there, the best setting is the one that fits your comfort, your home, and your cooling system. Ceiling fans, good insulation, and a programmable thermostat can make a higher temperature feel more comfortable than many homeowners expect. B & W Heating & Cooling helps Edwardsville residents find that balance and confirm their equipment can maintain the settings they prefer.

If you are comparing cooling providers in the area, it helps to review independent listings before deciding. Details about the company's service record appear on its  local business profile and its Nextdoor page, where neighbors share their experiences with the company.

Frequently Asked Questions

What is the best AC temperature for summer in Edwardsville, IL?

A widely recommended starting point is 78°F while you are home and awake, which balances comfort with efficiency. From there you can adjust to your own preference and the day's humidity. In Edwardsville's muggy summers, pairing 78 with ceiling fans usually keeps the house comfortable.

How much can I save by raising my thermostat in summer?

Each degree you set above 72°F can cut your cooling costs by roughly 3 percent. Setting the thermostat back 7 to 10 degrees while you are away for eight hours a day can save as much as 10 percent a year. Over a long Edwardsville cooling season, those adjustments add up.

What temperature should I set my AC when I leave the house?

Raising the setting 7 to 10 degrees above your normal number works well for a daytime absence. Try to keep it below 80 to 85 degrees, though, so the system still runs enough to control humidity. Letting it climb too high can leave the house damp and harder to cool on your return.

Is 78 degrees really comfortable in an Edwardsville summer?

For most people, 78 feels comfortable when paired with ceiling fans and decent airflow. Moving air helps your body feel a few degrees cooler than the thermostat reading. If it feels warm at first, lowering it gradually over a few days while running fans usually closes the gap.

What temperature is best for sleeping with the AC on?

Many people sleep better in a slightly cooler room, often between 72 and 75 degrees, because the body cools naturally during sleep. If saving energy is the priority, setting back a few degrees from your daytime number still works for many sleepers. A programmable thermostat makes it easy to test settings without adjusting it each night.

Why does humidity affect what temperature I should set?

The air conditioner pulls moisture from the air as it cools, and drier air feels cooler at the same temperature. If the system rarely runs, humidity builds and the house feels sticky. In humid Edwardsville summers, this is why an away setting that is too high can backfire.

When should I call B & W Heating & Cooling about my AC settings?

Reach out when the house feels humid, when the system struggles to hold a comfortable setting, or when you want help programming a thermostat. B & W Heating & Cooling assesses system efficiency, sizing, and humidity performance, then recommends settings that fit your home. Getting that guidance early helps your system run efficiently through the Edwardsville summer.