Change your air filters. How to Choose an Air Filter Save money while improving the air quality and efficiency of your home HVAC system by changing or upgrading your filter. The first step is to make sure you have the right measurements. Consult our Buying Guide to help you choose the type of filter by the level of filtration that your home needs. Regular maintenance will keep your heating and cooling system operating at its peak performance level and help reduce your utility costs. Selecting the Right Thermostat for Your Home Making your home comfortable is very important. Thermostats control air circulation from your heating and cooling system, which in turn, will help improve your air filtration. With today's new wifi and programmable thermostats, air quality has never been easier to maintain. With a quality air filter you will never have to sacrifice clean, healthy air. The Home Depot has a large selection of HVAC air filters for both residential air conditioning and commercial air conditioning.