Maintaining a Cooling & Heating Unit is much like a Car. In order for it to run as it should it needs to be maintained throughout the year. Priority Cooling & Heating offers a Maintenance Plan for $189 a year. We check the complete system each time. Twice a Year a Scheduled Service will be provided. We ask the customer to call when it is convenient for them. Working around their schedule not ours. We check for damage to any parts of the unit. Perform a Visual on the Plenum to make sure it is sealed.