You’ll want to check for a production date. This is usually found on a label on the surface of your equipment.
If your system is newer than five years old, it could still be under warranty. Having said that, warranty terms and conditions vary between manufacturer and installing company.
At Bryant Heating & Cooling Service Experts, we can check your warranty state via a system inspection. We also offer HVAC service memberships in Windsor for residential heating and AC equipment, regardless of system age or manufacturer warranty standing.