You’ll want to find a production date. This is typically found on a label on the exterior of your unit.
If your system is newer than five years old, it could still be warrantied. Having said that, warranty terms and conditions vary by manufacturer and installing company.
At Coastal Service Experts, we can verify your warranty state through a system inspection. We also have HVAC service memberships in Savannah for residential heating and AC systems, regardless of unit age or manufacturer warranty status.