Is the HVAC system in your Chesterfield, Missouri, home running efficiently? If not, you’re likely spending more than needed to cool your home and feel comfortable. Here are the top five factors that affect HVAC efficiency and how you can improve it:

Fan Settings

Manual and automatic are two fan setting options you have when you run your HVAC system. If your fan is set to manual, it’ll always circulate air even when the unit isn’t heating or cooling. Your energy bill will be higher, and your filters will clog more quickly in manual mode.

Switch to the automatic fan setting so the fan only turns on when the unit does to disperse warm or cool air throughout your home. Automatic mode helps you save money on utility bills and air filters, since you won’t need to replace them as often.

Indoor Air Quality

When things like dust, debris, and pet dander move into the HVAC system’s air filters, the system begins to work harder and becomes less energy-efficient. If you take steps to fix poor indoor air quality, your system will run better and you’ll breathe easier.

Our service technicians can help identify problems, provide advice and offer solutions. We can recommend additional equipment, such as an air purifier or ventilator, that can help keep your air clean.


The age of your unit has an effect on its efficiency for a couple of reasons. The first is that federal regulations for manufacturers have changed over the years, with a push toward creating more energy-efficient HVAC systems. If your system is older than 10 years, chances are it’s using too much energy. As a result, you’re paying more than needed to cool and heat your home.

The second reason that age matters is that the average life span of an HVAC system is 10 to 15 years. It’s a good idea to have an older unit inspected by a professional to determine its level of HVAC efficiency. We can let you know if it’s time to upgrade to a newer model. It may be more cost-effective to replace your unit than to continue fixing an outdated model that uses too much energy.

System Size

If your current system is too small to cool and heat the space inside your home, it’ll have to work harder and longer to try to reach a set temperature. Overworking an HVAC system leads to more energy usage, higher utility bills and early system failures. Your home may also be insufficiently heated or cooled to the point where you never truly feel as comfortable as you’d like.

It’s also not ideal to have an HVAC system that’s too large for your space. Operating a unit that’s too big wastes both energy and money. It can cool your home quickly but often unevenly. It also cycles on and off repeatedly and more often than a right-sized system would.

Our professional service technicians can help you determine whether your current system is the correct size. When you’re ready to upgrade or replace your HVAC system, we can recommend the best size to install. As a result, you’ll maintain high HVAC efficiency and enjoy low energy bills.

Preventive Maintenance

Your system works hard to keep up with the temperature demands you set all year long. A regular checkup resolves problems and keeps your equipment running as efficiently as possible. The main cause of reduced efficiency and system failure is a lack of routine maintenance, so don’t delay thinking that maintenance isn’t a good investment. Management of smaller issues now will help you avoid larger problems in the future.

We recommend two tune-ups per year — one in the spring for air conditioning and one in the fall for heating. Our professionals will check your system’s components and efficiency to ensure it operates at peak performance when you need it most.

At Averill Heating & Air Conditioning, we offer a variety of preventive maintenance plans to help our customers take care of their valuable equipment. Call us at (314) 427-3825 to learn more the ways in which you can improve the efficiency of your HVAC system.

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