You’ll want to find a manufacture date. This is typically found on a label on the surface of your system.
If your system is less than five years old, it might still be protected by a warranty. At the same time, warranty terms and conditions vary between manufacturer and installing company.
At Strand Brothers Service Experts, we can check your warranty standing with a system inspection. We also have HVAC service memberships in Austin for residential heating and cooling units, regardless of unit age or manufacturer warranty standing.