You’ll want to check for a manufacture date. This is usually located on a label on the surface of your system.
If your unit is less than five years old, it may still be protected by a warranty. At the same time, warranty terms and conditions differ manufacturer and installing company.
At Becht/Givens Service Experts, we can verify your warranty status via a system inspection. We also have HVAC service memberships in Louisville for residential heating and AC systems, regardless of unit age or manufacturer warranty status.