So, it took us about a whole month to notice that we didnt have cold air... Monday night it got really really hot... and we were wondering why the vents were blowing just reg. air.... o thats because we did have the thermostate hooked up the air conditioner... funny us. Luckily our uncle came over and descovered that for us. Were all good to go! And its so nice... Honestly i dont know what i'd do without it in this hEAt!