You’ll want to find the date it was made. This is usually situated on a label on the outside of your equipment.
If your system is under five years old, it could still be protected by a warranty. However, warranty terms and conditions vary by manufacturer and installing company.
At Neal Harris Service Experts, we can check your warranty status via a system inspection. We also have HVAC service memberships in Kansas City for residential heating and cooling units, regardless of equipment age or manufacturer warranty standing.