You’ll want to look for a manufacture date. This is typically situated on a label on the surface of your system.
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 Broad Ripple Service Experts, we can check your warranty status via a system inspection. We also have HVAC service memberships in Indianapolis for residential heating and AC units, regardless of unit age or manufacturer warranty status.