I used a cooler chest like in the video I posted for about 2 weeks as a supplemental ac unit for my dog while I was at work- It kept the room he was in (bathroom) noticeably cooler so I could leave the house ac higher. However I have gotten lazy and I was driving my my SO nuts with this sort of penny pinching behavior so I stopped. Its good for a few degrees- it definitely works, but does take some effort.