The general recommendation is to change your furnace filters at least every 90 days. However, this is just a generalized recommendation, and other factors come into play that can decrease the longevity of the furnace filter.

If you smoke, vape or have indoor pets, it might be better to replace your air filters every 60 days. If allergies or asthma are an issue in your household, replacing your filters every month could help keep the air cleaner, especially with a higher MERV rated filter.

Your furnace filter is located in a vent either on an interior wall or in the ceiling. The vent is usually white, but can sometimes be painted the same color of the wall. Simply pull the little level on the side to open the vent. Remove the old filter and replace the new furnace filter.

When you change your air filters depends on the indoor air quality levels you want to achieve. While Filter King filters can last 90 days, you may want to change them sooner. There are several factors that go into when you might want to switch out the current furnace filter. If you have allergies or asthma, a fresh filter can help with indoor air quality. If you have pets or smoke, then changing air filters sooner than 90 days can keep the air quality fresher.

Depending on your AC unit, the air filter slot may be located in a hard to find location. First, try checking the blower compartment or return air duct where the air is cleaned before going through the unit. The unit itself may have the air filter inserted in a specific location.

Yes, but it is not recommended that you do so. There are several issues that occur for an AC unit, your home air system, and the home itself when an air filter is not installed. Think of an air filter as a gatekeeper (which really is), and its purpose is to protect both you and your AC system from dust and dirt, that if left unfiltered, can cause harm to both you and your AC unit in the long run.