You’ll want to look for a manufacture date. This is typically located on a label on the surface of your system.
If your unit is under five years old, it might still be protected by a warranty. Having said that, warranty terms and conditions vary by manufacturer and installing company.
At Broad Ripple Service Experts, we can confirm your warranty status via a system inspection. We also provide HVAC service memberships in Indianapolis for residential heating and AC equipment, regardless of unit age or manufacturer warranty status.