Be sure to change the filters regularly at least every three months. If you replace your central air conditioner, make sure that the contractor replaces the indoor coil as well as the outside condensing unit. Otherwise, your system won't perform at its promised efficiency. Install electric ceiling fans to boost the efficiency of room air conditioners in the summer and to circulate warm air away from the ceiling in the winter. Be sure to clean or replace filters of all equipment regularly.
Clogged filters make appliances work harder, so they use more energy to do the same job.
Check the efficiency ratings mandated by the Department of Energy when you shop for new equipment so you can make sure you're getting high-efficiency equipment. Ratings will be prominently displayed on the yellow hang tag required by law to be on each new unit sold. 3 - If your heating and air conditioning system is over 12 years old, consider replacement. Newer units are much more efficient. They also come with better warranties so no expensive repair bills to worry about.