AC Efficiency Myths

When it comes to air conditioning and energy savings, many people misunderstand how air conditioners work and how to save on utility costs. Below we explain six myths about A/C efficiency and clear up some of the confusion around central air conditioning and energy use.

Air Conditioning Efficiency Myths Explained

This is not necessarily true if your unit is not sized correctly. Even though all new air conditioning systems are rated as 'energy-efficient according to minimum SEER ratings, having an oversized unit installed in your home could cost you more money. An air conditioning system that is too large for your home will cycle on and off repeatedly, placing heavy wear and tear on the system, and will use more energy.

Another one of the myths about A/C efficiency is that if you close register vents in unused rooms, then more cool air will flow to other rooms that are being used. This is a false assumption because energy has already been expended to cool the air flowing through the air ducts. By closing an air register vent, all you end up doing is cooling the inside of the air ducts, since your system is designed to manage cooling for your entire home.
If you want to be able to close off areas where you do not want cooling to occur, then consider a zoned cooling system. A zoned system uses multiple thermostats that control dampers within the ductwork to control room temperatures according to your needs.

Turning off your air conditioner allows your home to get much warmer while you are not home. Ultimately, this will only require more energy to bring the temperature back down to a comfortable level when you return. The best thing you can do while you are out is to adjust your thermostat up 10 degrees when you are not home. This will allow the system to still manage humidity while you're away and provide quicker comfort upon your return. Using a programmable thermostat will allow you to change the temperature to a cooler setting a day or so before you return so your home is cool and comfortable when you arrive.

The air handler in your air conditioning system can only move warm air at a set speed. By setting the thermostat at a very low temperature, you are only wasting energy and your home will not cool any faster.
Another risk you take by setting the thermostat too cold is that components can freeze. In this case, the external evaporator coil can accumulate ice and the internal system can malfunction if dealing with too much moisture inside.

While keeping windows and doors closed does keep cool air from escaping, you may be losing cool air from leaks through the smallest of places around unsealed doors, windows, recessed lighting, electrical outlets and in ductwork.
To find out where other energy-stealing leaks are occurring in your home, consider having an energy audit done. A professional HVAC specialist can perform blower door and thermographic imaging tests to find leaks. Read more about the benefits of sealing and insulation here.

This myth is a little deceiving in its wording. Ceiling fans DO create a wind-chill effect as the air comes into direct contact with your skin, so YOU will feel cooler. However, a ceiling fan does not reduce actual air temperature. By running a ceiling fan in an empty room, you are only wasting energy. Keep in mind that if you operate a ceiling fan in a room where people are, you can take advantage of the wind-chill effect and save money by turning up your thermostat by a few degrees.

  1. Purchasing an energy-efficient AC system will automatically save money on utility bills.
  2. Closing vents in unused rooms will boost efficiency.
  3. Turning off AC while away saves energy.
  4. Dropping the thermostat setting extra low will cool your house faster.
  5. Won't lose cool air if windows and doors are kept closed.
  6. Leaving a ceiling fan on will cool an empty room.

If you're in need of repairs or maintenance for your home air conditioning and heating system, call AC Express right away! Our certified technicians can respond the same-day. Call now! (512) 866-5520