IF THIS PRODUCT IS SHOWING AS UNAVAILABLE, PLEASE CALL YOUR LOCAL STORE TO ORDER. No vacuuming, pressure testing or expensive tools required. This system comes equipped with many functions that separate it from the rest. It has multiple operating modes, which include Auto, Heat, Cool, Fan-Only, Dry (dehumidification) and Sleep. It also features the Follow Me function, which allows the system to continually adjust the room temperature based on where the hand-held remote controller is. Need to operate the system when you're not at home. No problem. The MRCOOL system also has the capability of being operated with your smartphone with the use of the Smart HVAC app. MRCOOL stands behind the quality and workmanship of this system.