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Best Temperature for Air Conditioner in Summer

​What is the best temperature for an air conditioner in summer? For most homeowners, a good starting point is 75–78°F during the day when you're at home. If you're comfortable at a higher temperature, setting your thermostat closer to 78°F can reduce air-conditioning demand and potentially lower cooling costs.
When you're asleep, away from home, or particularly sensitive to heat, you may prefer a different setting. The ideal temperature ultimately depends on comfort, humidity, insulation, outdoor conditions and the efficiency of your HVAC system.
For homeowners in Paterson, NJ, summer weather can bring periods of high heat and humidity, making thermostat settings especially important. A properly maintained and correctly sized AC system should be able to maintain a comfortable indoor temperature without running continuously.
If your air conditioner can't maintain the temperature you set, call HVAC Paterson at (973) 833-3261 for professional AC service.
Key Takeaways

1. 75–78°F is a good summer thermostat range for many households.
2. 78°F is often recommended as an energy-conscious setting when you're home and comfortable at that temperature.
3. You may be able to set the thermostat higher when you're away from home.
4. Setting the AC extremely low does not make it cool the house proportionally faster.
5. Humidity matters just as much as temperature for comfort in summer.
6. A programmable or smart thermostat can make temperature management easier.
7. Your AC should be capable of maintaining a reasonable thermostat setting during normal conditions.
8. If your AC runs constantly but can't reach the set temperature, there may be an underlying HVAC problem.
9. Airflow, insulation, ductwork and system sizing can all affect indoor comfort.
10. Regular AC maintenance can help your system operate efficiently during hot weather.

1. What Is the Best Temperature for AC in Summer?-For many households, 75–78°F is a practical summer thermostat range.
A commonly used energy-conscious setting is 78°F when you're home and comfortable.
However, there isn't one temperature that is perfect for everyone.
Some people are comfortable at 78°F, while others may prefer 72–74°F.
The important thing is to balance:

• Comfort
• Humidity
• Energy consumption
• Outdoor temperature
• AC performance
• Personal preference

If you need to set your thermostat unusually low just to feel comfortable, the problem may not be the thermostat setting.
It could indicate an issue with the HVAC system itself.
2. What Temperature Should I Set My AC To During the Day?-A good starting point is:
75–78°F when you're home.
If your home remains comfortable at 78°F, there's generally less work for the AC to do than if you set it to 70°F.
The difference may seem small, but even several degrees can affect how long your air conditioner operates.
For Paterson homeowners, another important consideration is humidity.
A room at 76°F with controlled humidity can feel considerably more comfortable than a room at the same temperature with excessive humidity.
3. Is 78°F a Good Temperature for Air Conditioning?-Yes.
For many households, 78°F is a reasonable summer thermostat setting, particularly if your priority is balancing comfort and energy consumption.
You don't have to use 78°F if it isn't comfortable for you.
Instead, try gradually increasing your thermostat:

• Start at 72–74°F.
• Increase it by 1°F.
• Allow the home to stabilize.
• Continue until you find a comfortable setting.

Even a modest increase can reduce the workload placed on your AC.
4. What Is the Best AC Temperature for Sleeping?-Many people prefer a cooler bedroom at night.
A reasonable starting point is approximately:
68–72°F for sleeping
However, individual preferences vary significantly.
Rather than cooling the entire home to a very low temperature, consider:

• Closing bedroom blinds during the day.
• Using ceiling fans.
• Improving bedroom airflow.
• Using a programmable thermostat.
• Adjusting the temperature slightly overnight.

A ceiling fan can make occupants feel cooler without necessarily requiring the thermostat to be lowered significantly.
5. What Temperature Should I Set My AC When I'm Away?-When you're away from home for several hours, you generally don't need to maintain the same temperature you use when you're there.
A setting around:
78–82°F
may be appropriate depending on outdoor conditions, humidity and how long you'll be away.
The goal isn't necessarily to turn the AC completely off.
During very hot and humid New Jersey weather, allowing indoor temperatures to rise excessively can create uncomfortable humidity and may place additional demands on the system when you return.
For longer vacations, the appropriate setting depends on the season, humidity, pets, plants and other factors.
6. Is 72°F Too Cold for AC in Summer?-Not necessarily, but it may be colder than necessary for many households.
A 72°F setting is a personal comfort preference.
However, lowering the thermostat does not make the AC cool the home twice as quickly.
If the indoor temperature is 80°F and you set the thermostat to 70°F, the air conditioner simply has a larger temperature difference to overcome.
This generally means the system needs to operate longer.
A more moderate setting can reduce cooling demand while still maintaining comfortable indoor conditions.
7. Does Setting the AC Lower Cool the House Faster?-No.
This is one of the most common thermostat misconceptions.
If your home is 82°F and you set the thermostat to 70°F, the AC doesn't suddenly operate at a higher cooling capacity simply because you've selected a lower temperature.
The system operates according to its controls and capacity.
Setting the thermostat to 70°F instead of 75°F generally means the system will continue cooling until it reaches the lower target.
If your AC takes an unusually long time to reach a reasonable setting, there may be an underlying issue.
8. Why Does My AC Run Constantly in Summer?-An air conditioner can run for extended periods during extremely hot weather.
Longer cycles aren't automatically a problem.
However, if your AC runs continuously but cannot reach a reasonable thermostat setting, possible causes include:

1. Dirty air filter
2. Restricted airflow
3. Dirty condenser coil
4. Low refrigerant
5. Refrigerant leak
6. Faulty compressor
7. Frozen evaporator coil
8. Undersized equipment
9. Ductwork problems
10. Poor insulation
11. Excessive heat entering the home
12. Thermostat problems

A professional diagnosis is necessary to determine the actual cause.
9. Why Does My House Feel Humid Even When the AC Is Running?-Temperature isn't the only factor determining comfort.
Humidity can make a home feel warmer than the thermostat reading suggests.
For example, a room at 75°F with high humidity may feel uncomfortable even though the thermostat indicates a relatively moderate temperature.
Possible causes of excessive indoor humidity include:

• Short AC cycles
• Oversized air conditioner
• Poor ventilation
• Moisture intrusion
• Ductwork problems
• Inadequate dehumidification
• High outdoor humidity

An oversized AC can sometimes cool a home quickly without operating long enough to remove sufficient moisture.
That's one reason proper HVAC sizing matters.
10. Should I Use a Ceiling Fan With My AC?-Yes.
Ceiling fans can make occupants feel cooler by increasing air movement across the skin.
This can allow some homeowners to set their thermostat slightly higher without sacrificing comfort.
However, remember:
Fans cool people, not rooms.
When leaving a room, turn off the fan unless it serves another purpose.
Using a fan together with a properly configured thermostat can be an effective way to improve comfort without dramatically lowering the AC temperature.
11. What Is the Best AC Temperature for Saving Money?-If energy savings are your priority, 78°F when you're home and comfortable is a commonly recommended starting point.
You can potentially save more by allowing the indoor temperature to rise when you're away.
Other ways to reduce cooling costs include:

1. Keep blinds and curtains closed during the hottest part of the day.
2. Replace a dirty HVAC filter.
3. Keep outdoor condenser coils clear.
4. Seal obvious air leaks.
5. Improve attic insulation.
6. Use ceiling fans.
7. Avoid unnecessary heat-producing appliances during the hottest hours.
8. Use a programmable or smart thermostat.
9. Schedule regular AC maintenance.
10. Have your ductwork inspected if rooms cool unevenly.

The thermostat is only one part of the equation.
A poorly insulated home with leaking ducts can consume significant energy even with a sensible thermostat setting.
12. What Is the Best Temperature for AC in a Humid Climate?-In humid summer weather, comfort depends on both temperature and moisture.
A setting around 75–78°F can be a good starting point, but the humidity level should also be considered.
If the home feels damp despite a reasonable temperature, don't automatically keep lowering the thermostat.
Instead, have the HVAC system evaluated.
The problem could involve:

• Oversized AC equipment
• Short cycling
• Poor airflow
• Refrigerant problems
• Drainage issues
• Inadequate dehumidification

Simply lowering the thermostat may mask rather than solve the underlying issue.
13. What Should I Set My AC To During a Paterson Heat Wave?-During an extreme heat event, your AC may need to operate for much longer periods.
Instead of dramatically lowering the thermostat, choose a reasonable target and allow the system to work toward it.
For example:
75–78°F can be a sensible starting range.
If your AC is healthy and appropriately sized, it should generally be capable of maintaining comfortable indoor conditions under normal design conditions.
During exceptionally hot weather, however, the system may operate continuously.
That isn't necessarily a sign of failure.
The important question is whether the system can maintain a reasonable indoor temperature.
14. Why Can't My AC Reach the Temperature on the Thermostat?-If your thermostat is set to 74°F but the home remains at 80°F, something may be wrong.
Potential causes include:
Dirty filter-A severely restricted filter can reduce airflow.
Low refrigerant-A refrigerant leak can reduce cooling capacity.
Dirty condenser-A dirty outdoor coil can restrict heat rejection.
Frozen evaporator coil-Restricted airflow or refrigerant problems can cause the coil to freeze.
Compressor problems-A failing compressor can prevent the system from producing adequate cooling.
Ductwork leaks-Conditioned air can escape before reaching the rooms.
Undersized ACA system that is too small may struggle to meet demand during extreme heat.
Thermostat problems-A faulty or poorly located thermostat can provide inaccurate temperature readings.
If your AC cannot maintain a reasonable temperature, professional diagnosis is more useful than continually lowering the thermostat.
15. Should I Leave My AC at One Temperature All Day?-Not necessarily.
A programmable thermostat can automatically adjust the temperature based on your schedule.
For example:
Home: 76°F
Away: 80°F
Sleeping: 74°F
These are only examples.
Your ideal settings depend on your household's comfort preferences and the characteristics of your home.
The benefit of a programmable thermostat is that you don't have to remember to change the temperature manually.
16. Are Smart Thermostats Worth It?-A smart thermostat can provide additional control over your HVAC system.
Depending on the model, features can include:

• Programmable schedules
• Remote temperature adjustment
• Learning schedules
• Occupancy detection
• Energy-use information
• Alerts
• Multiple temperature settings

However, a smart thermostat can't compensate for an improperly sized or poorly maintained HVAC system.
If your AC is struggling to maintain temperature, diagnose the HVAC problem before assuming that replacing the thermostat will solve it.
17. What If Different Rooms Are Different Temperatures?-Uneven temperatures are common in homes with:

• Poor duct design
• Leaking ducts
• Insufficient insulation
• Large windows
• Rooms exposed to direct sunlight
• Poor airflow
• Multiple floors
• Improperly sized HVAC equipment

Before immediately lowering the thermostat, determine why the rooms are different temperatures.
Possible solutions include:

1. Duct balancing
2. Duct repair
3. Improved insulation
4. Air sealing
5. Additional returns
6. Zoning
7. Ductless mini-splits
8. HVAC replacement

18. How Can I Keep My House Cool Without Lowering the AC?-You don't necessarily need to lower the thermostat to improve comfort.
Try these strategies:

1. Close blinds on sun-facing windows.
2. Use ceiling fans.
3. Keep doors and windows closed while AC is operating.
4. Replace a dirty air filter.
5. Reduce indoor heat-producing activities.
6. Use bathroom exhaust fans after showers.
7. Inspect attic insulation.
8. Seal obvious drafts.
9. Keep the outdoor condenser clear.
10. Schedule professional AC maintenance.

Small improvements throughout the home can reduce the cooling burden placed on your HVAC system.
19. When Should I Call an HVAC Technician?-Call an HVAC professional if:

• Your AC cannot reach the thermostat setting.
• The system runs continuously.
• The outdoor unit doesn't start.
• The AC blows warm air.
• The system repeatedly freezes.
• The circuit breaker keeps tripping.
• You hear unusual noises.
• Your energy bills suddenly increase.
• Some rooms are dramatically hotter than others.
• Indoor humidity remains excessive.

Don't keep lowering the thermostat in an attempt to compensate for a mechanical problem.
If the system isn't producing adequate cooling, it should be diagnosed.
Best Temperature for Air Conditioner in Summer FAQ-What is the best temperature to set my AC in summer?-For many households, 75–78°F is a good starting range when you're home. If you're comfortable at 78°F, the higher setting can reduce cooling demand compared with a much lower thermostat setting.
Is 78 degrees a good temperature for air conditioning?-Yes. 78°F is a commonly recommended energy-conscious summer thermostat setting. However, comfort is personal, so you can choose a lower setting if necessary.
Is 72°F too cold for AC in summer?-72°F isn't necessarily too cold, but it may be lower than necessary for many households. A lower thermostat setting generally means the AC must operate longer to reach and maintain the target temperature.
What temperature should I set my AC when I'm away?-Many homeowners can raise the thermostat several degrees while away. Around 78–82°F can be a reasonable starting range, depending on outdoor conditions, humidity and how long you'll be away.
What is the best AC temperature for sleeping?-Many people prefer approximately 68–72°F for sleeping, although individual comfort varies. Fans and breathable bedding can also improve comfort without requiring very low thermostat settings.
Why is my AC running constantly?-During extremely hot weather, continuous operation can be normal. If the AC runs constantly but cannot maintain a reasonable indoor temperature, possible causes include restricted airflow, low refrigerant, dirty coils, ductwork problems, equipment sizing or compressor problems.
Why is my house humid even when the AC is running?-High indoor humidity can be caused by short cycling, an oversized AC, inadequate dehumidification, ventilation problems or moisture entering the home. Lowering the thermostat may not solve the underlying problem.
Does lowering the thermostat cool my house faster?-No. Setting the thermostat significantly lower doesn't make the AC produce cooling proportionally faster. It simply gives the system a lower target temperature to reach.
Should I use a ceiling fan with my AC?-Yes. A ceiling fan can improve perceived comfort by moving air across your skin, potentially allowing you to maintain a slightly higher thermostat setting.
Why won't my AC reach the temperature I set?-Possible causes include dirty filters, restricted airflow, low refrigerant, dirty coils, frozen coils, ductwork problems, equipment sizing issues, compressor problems or thermostat issues. Professional diagnosis can identify the cause.
What is the best temperature for AC to save money?-78°F when you're home and comfortable is a reasonable energy-conscious starting point. You can generally use a higher setting when away, depending on the weather and humidity.
Why Choose HVAC Paterson?-Your thermostat setting is only one part of keeping your home comfortable.
If your AC is properly sized, maintained and operating correctly, you should be able to maintain a comfortable summer temperature without constantly adjusting the thermostat.
HVAC Paterson provides professional air-conditioning services for homeowners in Paterson, NJ and surrounding North Jersey communities.
If your AC isn't keeping up this summer, contact:
HVAC Paterson
Paterson, New Jersey
Phone: (973) 833-3261
Final Answer: What Is the Best AC Temperature in Summer?For most homeowners, 75–78°F is a sensible summer thermostat range, with 78°F being a good energy-conscious starting point if you're comfortable at that temperature.
For sleeping, many people prefer approximately 68–72°F, while an occupied home can often be set several degrees higher when everyone is away.
If you have to keep lowering your thermostat because your AC can't maintain the temperature, don't assume you simply need a colder setting.
The problem could be airflow, refrigerant, ductwork, system sizing, the compressor or another HVAC component.
If your AC isn't keeping your Paterson home cool, call HVAC Paterson at (973) 833-3261.