You’ll want to check for the date it was made. This is usually situated on a label on the exterior of your unit.
If your system is less than five years old, it could still be under warranty. Having said that, warranty terms and conditions vary between manufacturer and installing company.
At Komfort Air, we can confirm your warranty state via a system inspection. We also offer HVAC service memberships in Charlotte for residential heating and AC units, regardless of system age or manufacturer warranty standing.