You’ll want to find a manufacture date. This is usually found on a label on the surface of your unit.
If your system is under five years old, it might still be under warranty. However, warranty terms and conditions differ manufacturer and installing company.
At Service Experts Heating & Air Conditioning, we can check your warranty standing with a system inspection. We also offer HVAC service memberships in Longmont for residential heating and cooling systems, regardless of equipment age or manufacturer warranty validity.