Some do.. i have 1 in the bigger flower room an i have one in the room that my tent an cabinet are in.. the one in the flower roo. Has a thermostat an it serves its purpose beings its in the same room.. but the fan still continueously runs just the compressor shuts off. The one in the room the tents in just has high an low cool with 1 , 2, 3, 4 ,5,6,7. 7 being the coldest, an i have the one side ducted into my tent an the smaller side ducted into a cabinet.. which is the one i need it for.. gonna have to have the plug in piece in the tent an the ac plugged into that which is doable since my surge protecter is mountedto the top of the tent along the pole an can just run the ac cord thru the top vent.. , an flock thats exactly what i need