If it is a Carrier system it should have a 5-year labor and 10-year parts warranty. Most likely, the company who installed the system and will service the warranty is Munn's. If not Munn's, any Carrier authorized dealer should be able to repair the unit under the warranty. The name of the installer should be written on a sticker on the air handing unit. You can write down the serial number on the air handling unit in the garage and look up the warranty status on the Carrier website.
One thing you can check is to see if the condensate drain line is clogged. Pour hot water down the drain and see if it comes out of the pipe behind the garage.
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