This AC cools a room down fast. We are very pleased with the performance. Our den has 12' ceilings and is 22'x20". The den is very cool during the day and cold at night. Easy to change temperature setting manually or with the remote. There is some noise but nothing that bothers our conversations or watching tv. The kitchen is cooler too! Our house was built in 1947 so it has been hard to find an AC that works just good but this LG AC is awesome. It can get HOT here in south central Texas and this LG AC works GREAT!