Air conditioning, and its accompanying fan, can drain more energy than any other building comfort system. So, it’s important to understand what’s behind the numbers.

To learn how to reduce energy costs while maintaining a comfortable indoor environment, follow these 10 tips:

Tip No. 1: Set A/C thermostat at 78 degrees. The optimal setting for air conditioning is 78 degrees to the nearest degree.

Tip No. 2: Check compressor and other equipment. To ensure a comfortable indoor environment, inspect these devices. For example, if the compressor requires frequent adjustment or repairs, you may have a problem that’s affecting the efficiency of your system. You can check the compressor’s pressure gauge. In addition, check the refrigerant charge level. If the temperature is getting too high, the refrigerant level is probably low.

Tip No. 3: Install high-efficiency air conditioners. High-efficiency air conditioners (HVAC) can boost your energy savings. They typically cost a bit more than lower-efficiency (LIHE) systems, but the payback comes in the savings you’ll see in your energy bill. According to the U.S. Department of Energy, each percentage point reduction in energy use reduces your bills by as much as 9 cents per day. And, if you’re ready for an upgrade, you can see an extra $60 on your next utility bill by replacing a conventional air conditioning system with a high-efficiency air conditioning system.

Tip No. 4: Use heat pumps. Heat pumps can provide an efficient cooling solution. (See “The Top 10 reasons to use a heat pump,” for more information.)

Tip No. 5: Install programmable thermostats. In most cases, programmable thermostats help save energy. If your thermostat has a remote control, use it. Some people like to program their thermostat in advance of departure, but you’ll get the most energy-saving results if you use a programmable thermostat during the day and at night. If you leave your home unattended when it’s hot or cold, your A/C will run. This wastes energy. If you don’t have a programmable thermostat, it’s a good idea to change the schedule when you leave.

Tip No. 6: Close blinds and curtains. Shutting the blinds and curtains in your home saves up to 50 percent of cooling costs.

Tip No. 7: Install ceiling fans. Installing ceiling fans with light bulbs provides the most energy savings. Be sure to use these fans during the cooling season.

Tip No. 8: Check your ducts and plumbing. Is your ductwork in need of maintenance? Or, is the drain in your home clogged? Any of these things can make your system less efficient. If you’re unsure of the extent of a problem, check with a heating and cooling company. They can diagnose problems in your ductwork and plumbing.

Tip No. 9: Check the A/C unit. Check that the A/C unit is not running to cool only the inside of the house.

Tip No. 10: Pay the bills. If you’re using electricity, you’ll pay the utility company for the energy it costs to run your A/C. That’s why it’s so important to use an energy-efficient air conditioning system. And, it’s a good idea to monitor your bills. If your bills appear to be too high, check your A/C and other energy-using appliances.