You’ll want to look for the date it was made. This is usually situated on a label on the surface of your unit.
If your system is newer than five years old, it may still be warrantied. However, warranty terms and conditions vary between manufacturer and installing company.
At TML Service Experts, we can confirm your warranty status with a system inspection. We also provide HVAC service memberships in Boise for residential heating and cooling units, regardless of unit age or manufacturer warranty status.