You’ll want to find the date it was made. This is usually found on a label on the surface of your system.
If your system is under five years old, it might still be warrantied. At the same time, warranty terms and conditions vary between manufacturer and installing company.
At Jack Nelson Service Experts, we can confirm your warranty standing with a system inspection. We also have HVAC service memberships in Tulsa for residential heating and cooling units, regardless of system age or manufacturer warranty status.