Is it better to leave the AC on all day?
Sophia Aguilar
Published May 28, 2026
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Correspondingly, is it cheaper to leave air conditioner on all day?
In general, it is cheaper to leave the AC on all day during very hot temperatures. However, it's not efficient to keep it on full blast all the time. Your exact results may vary depending on your AC system. So, it's best to consult a professional if you aren't sure about how to lower your energy bills.
Also, is it better to leave AC on auto or on? The fan only runs when the furnace tells it to. On cooling, the fan will run only when the air conditioner is running. Pros. The "auto" setting means less energy usage, because it keeps the fan running the least amount of time at the slowest speed needed for heating and cooling.
Similarly one may ask, is it better to leave air conditioning on all day?
While it's not advisable to leave your air conditioner on all day if you're, say, at work from nine to five, no one wants to come home to a hot house either. A programmable thermostat is a simple way to program your air conditioning system to adjust to a set temperature at various times throughout the day.
Should you turn your AC up when you leave?
But there's a much better way: Turn your thermostat up instead of turning the AC completely off. More specifically, we suggest turning the set temperature up 7 to 10 degrees while you're away for the day. Turning up the thermostat is the better option because it: Protects your home from mold and bugs.
Related Question AnswersIs 72 a good temperature for air conditioning?
The Ideal Summer Thermostat Setting For most people, the normal comfort zone temperature sits around 72-73 degrees—but an air conditioner isn't a highly scientific machine. Setting the thermostat at 78 degrees typically keeps enough cool air in the room for comfort.How can I reduce my AC electricity bill?
8 ways to reduce your air conditioner electricity cost- Turn it up one degree.
- Use a smart thermostat and program a schedule.
- Keep ducts clean and airflow clear.
- Schedule regular maintenance visits.
- Change air filters.
- Insulate your space to keep cool air in.
- Retrofit your AC unit.
- Upgrade to an energy efficient air conditioner.