I have them on my unit but I would be lyin if I said they kept the unit cooler in the hot temps. They do keep it cleaner. Any thought about putting in a 2nd a/c through a wall? I have a friend that did it to his. he lives in texas. the a.c is in the bed room it is not too big so when he travels he can remove it and put it on the floor and puts a cover over the hole. just a thought. Now all you would need is time.