Best Thermostat Settings for Summer Comfort

 

A thermostat set to 68 degrees will not cool a hot home faster. It will simply keep the air conditioner running longer, often raising the electric bill and putting more strain on equipment during an Anaheim heat wave. The best thermostat settings for summer balance comfort, energy use, household routines, and the condition of the cooling system.

For many Southern California homes, 78 degrees is a sensible starting point while people are home and active. That number is not a rule everyone must follow. A shaded home, a family with young children, a senior resident, or a space with high afternoon sun exposure may need a different approach. The goal is a setting that keeps people comfortable without asking the system to work harder than necessary all day.

Best Thermostat Settings for Summer at Home

Start by setting your thermostat to 78 degrees when the home is occupied. This is a practical target for controlling cooling costs while maintaining reasonable indoor comfort. Use ceiling fans or portable fans in occupied rooms to improve airflow. Fans cool people, not rooms, so switch them off when the room is empty.

At night, many households prefer a slightly lower setting, often 74 to 76 degrees. Bedrooms can feel warmer because doors are closed, heat builds upstairs, or bedding limits airflow. Rather than lowering the whole-home temperature dramatically, first check that bedroom vents are open and unobstructed. A fan may also make a 76-degree room feel much more comfortable.

When everyone is away for several hours, raise the thermostat to about 82 to 85 degrees. This reduces unnecessary cooling while protecting the home from excessive heat. In a house with pets, sensitive electronics, or occupants who return at different times, a lower away setting may be more appropriate. The right number depends on the property, not just a generic recommendation.

A smart or programmable thermostat makes these changes easier. Schedule the home to begin cooling shortly before people arrive rather than running at the occupied setting all day. Avoid setting a large temperature jump immediately before returning home. During very hot weather, asking the system to bring the house down by 10 or 12 degrees at once can lead to a long, expensive cooling cycle.

Why 78 Degrees Is Often the Recommended Starting Point

Every degree below your normal summer setting can increase cooling demand. That is why a modest adjustment can make a noticeable difference on a monthly utility bill. In Anaheim, where hot afternoons can push an AC system hard, a steady setting also helps avoid constant cycling and wide indoor temperature swings.

Still, 78 degrees is only a starting point. Indoor comfort is shaped by more than the number on the thermostat. Humidity, direct sunlight, insulation, window coverings, air movement, and the number of people in the house all affect how a room feels. A well-maintained system in a shaded, insulated home may hold 78 degrees comfortably. A poorly sealed home with west-facing windows may struggle even at a higher setting.

Instead of turning the thermostat down several degrees at once, make one-degree adjustments over a few days. This gives your household time to find a comfortable range and makes it easier to see how the change affects energy use.

Do not use the thermostat as a speed control

If the indoor temperature is 84 degrees and the thermostat is set to 72, the AC does not cool at extra speed. Most residential systems cool at a relatively fixed rate whenever they are running. Setting an unrealistic temperature only extends the run time and may leave the system operating for hours during the hottest part of the day.

Set the temperature you actually want, then give the equipment time to reach it. If the system cannot maintain a reasonable setting, or airflow feels weak, the issue may be a dirty filter, blocked vent, refrigerant concern, electrical problem, duct leakage, or an aging unit that needs service.

Setbacks: Helpful, but Not Always Extreme

Raising the temperature while a building is empty is usually a smart summer habit. For a typical home, an increase of 4 to 7 degrees during work or school hours can reduce cooling runtime. The same idea applies to offices, retail spaces, and rental properties, although commercial schedules often need more careful planning.

Extreme setbacks are not automatically better. If a building becomes very hot, surfaces, furniture, and walls absorb heat. When cooling starts again, the system must remove heat from all of those materials, not just the air. A large setback can be worthwhile in some properties, but it can also cause a long recovery period and reduced comfort at opening time or when the family gets home.

For commercial spaces, start with a moderate unoccupied setting and adjust based on building performance. A small office may be able to rise to 82 degrees overnight. A restaurant, medical office, server room, or business with temperature-sensitive inventory may need tighter control. Facility managers should also consider cleaning schedules, early staff arrival, and customer-facing hours before creating an automated schedule.

Use Your Thermostat Schedule With the Weather

Anaheim summers are not identical from week to week. A thermostat schedule should be flexible enough to respond to a heat advisory, vacation period, or a change in occupancy. On milder days, allowing the home to run a degree warmer can reduce AC use without affecting comfort. On an unusually hot day, closing blinds before noon and starting the cooling cycle a little earlier may be more effective than dropping the setpoint sharply in late afternoon.

Keep windows and exterior doors closed while the AC is running. Close curtains, shades, or blinds on sun-facing windows, especially in rooms that heat up late in the day. These simple measures reduce heat entering the property, which gives the thermostat setting a better chance of working as intended.

If you have a smart thermostat, use its scheduling features carefully. Geofencing and learning modes can be convenient, but review the schedule after the first few weeks. An automated setting that repeatedly cools an empty home or allows a property to become too warm is not saving money.

When a Thermostat Setting Will Not Solve the Problem

A thermostat cannot correct an AC system that is underperforming. If one room is consistently hot, the thermostat may be in the wrong location, but the cause could also be an airflow or ductwork issue. Closing too many supply vents, for example, can restrict airflow and create pressure problems rather than directing cooling where it is needed.

Change or clean the air filter on the schedule recommended for your system and home conditions. A clogged filter restricts airflow, makes the equipment work harder, and can contribute to frozen coils or uneven cooling. Keep the outdoor unit clear of leaves, stored items, and overgrown landscaping so it can release heat properly.

Arrange professional service if you notice warm air from the vents, ice on refrigerant lines, unusual noises, frequent short cycling, water near indoor equipment, or an AC that runs continuously without reaching the set temperature. Prompt diagnosis can prevent a smaller issue from becoming a mid-summer breakdown. Preventive maintenance also helps confirm that electrical components, refrigerant performance, drainage, and airflow are ready for the season.

A Practical Starting Schedule

For a household that is typically out during the day, try 78 degrees when occupied, 82 to 85 degrees while away, and 74 to 76 degrees for sleeping if that is comfortable for everyone. Keep the differences moderate, use fans in occupied rooms, and make small adjustments based on how the home actually performs.

For a business, set the occupied temperature according to employee and customer comfort, then choose an unoccupied setting that avoids wasted cooling without creating an uncomfortable morning recovery period. Properties with multiple zones should use them. There is little value in cooling unused conference rooms, storage areas, or vacant suites to the same level as busy workspaces.

If a reasonable thermostat setting still leaves your home or business uncomfortable, the answer is not always a colder number. A quick, professional inspection can identify whether airflow, maintenance, controls, ductwork, or equipment performance is standing between you and reliable summer comfort.