Frequently asked questions.

HVAC System Filters

Where is my air filter located?
Your air filter is located in either the blower compartment of your furnace, in an attached filter case, or in a wall-mounted return air grille. If you cannot locate the air filter, call Complete Comfort Services for assistance.

When should I change my air filter?
Every month, you should inspect or clean your air filter, or replace it if necessary, to keep your equipment running at peak efficiency.

Where can I purchase air filters?
You can purchase replacement filters from your Lennox dealer. Some filters are not recommended by Lennox for use with Lennox heating and cooling equipment because they may be too restrictive and cause system malfunctions. Your Lennox dealer can help you choose the best filter for your HVAC system and needs.