We used this product to air condition the garage. It works really really well and is very quiet. Cools our garage down to 70 pretty quickly even though it's 98 outside. It was pretty difficult to install and the warranty is no good on the product unless you have it installed by a licensed HVAC person. I do highly recommend the product but suggest it if you know someone in HVAC. My warranty is no good because we did it ourself. Hopefully it continues to work as well as it has been. Also, I couldn't find this information anywhere, but it does come precharged.