The Extreme ti wine cellar cooling system functions like the tiR and is intended for through-the-wall installation. The difference between the ti and tiR is that the controller and display will be located on the front face of the ti unit. To monitor your cellar conditions, you will need to enter your cellar physically. If this unit will be installed through an exterior wall, you must purchase an exterior housing to protect the unit. If this unit is installed through an interior wall, then the hot air exhaust may need to be redirected to another location using the condenser ducting plenum kit.