Can Outside Temperature Affect Central AC?

Set the Thermostat

• Using your central air system during hot days increases the amount of electricity you use, resulting in a higher power bill. To reduce costs, set your thermostat to at least 78 degrees F higher. Completely shut off your system when at work or on vacation, or use a programmable thermostat that you can set to turn on your system shortly before you return home for the day. Make a point to only turn on your system on extremely hot days.

Checking Efficiency

• Doing an efficiency audit on your home can keep cool air from escaping your home. Inspect around your window and doors for cracks. Chalk and install weatherstripping where needed. Close register vents in rooms you don't use. Install ceiling fans. They can circulate the cool air produced by your central air system throughout the house, keeping it cooler for a longer time. On cooler summer days, turn off your system and open windows to cool your home.

Maintenance

• Perform regular maintenance on your central air system to increase its performance and extend its life. Check the ducts inside your home for cracks and repair them when needed. Keep the outside encasement of your central air compressor clean of dirt and organic material. Don't plant flowers near the compressor; they may restrict air flow. Replace air filters in your furnace regularly. When unable to do maintenance yourself, hire a qualified professional technician or company.

Replacing Old Units

• If your central air-conditioning unit is an older model, consider replacing it with a new unit. Using an inefficient unit won't completely cool your house and costs more money to operate. Energy efficient and friendlier to the environment, newer units may save you money in the long run despite the upfront purchase cost. If possible, install your new unit in a shady area. It uses less energy to operate than one positioned in constant bright sunlight.