Change your A/C filter.
Changing the air conditioner filter really does have a HUGE effect. Even a partially clogged filter can result in an A/C breakdown during extreme heat.
Keep the thermostat at a steady temperature.
When you’re away, 76-78 degrees is a starting point. Some people think that turning the A/C off during the day saves money on energy bills: it does not. When turned off all day, the A/C has to work harder to cool down a hot space, and results in more energy use. Not to mention that you and your house stay hot for hours.
Close doors and vents in unused spaces.
Don’t cool what you don’t use.
Install shades or thermal curtains on windows facing the sun. This includes doors with glass panels.
Thermal insulating, energy-efficient curtains are available at reasonable prices at Walmart, BigLots, Amazon, and more.
Don’t use the oven during the heat of the day.
Don’t run clothes dryers during the heat of the day.
This includes running the dishwasher , or any appliance that generates heat for that matter.
Turn the thermostat down a couple degrees at night.
You will sleep better, and the A/C works less to cool your home during evening hours.
Use a digital thermostat.
Digital thermostats are more accurate and can be programmed to different temperatures for specific times of the day.
Maintain your A/C unit.
Like running a car for 100,000 miles without an oil change, not maintaining your air conditioner could mean a total A/C breakdown at the worst time.
Shade the outdoor A/C unit, if possible.
In times of extreme heat, an unused beach or patio umbrella can be repurposed to provide shade for the A/C unit. Just be careful not to block or touch the coils.
Thanks to Integrity Air Conditioning