I live in a 2400 sq/ft home.  Due to an accident 5 years ago, I lost vision in 1 eye and legally blind in the other.  Due to being disabled, money can definitely be tight.  Using this device with my central air, I do not have to have the central air on low temps going in rooms that I probably will not go in for days at a time.  This unit allows me to being cool without burning money in access.  This unit is also great if you have a home gym.  Since I am home bound the majority due to my disability, this unit has improved my living situation.  I hope that this review is useful for someone with the same circumstances as I because it is something that I should of bought a long time ago.  Great product.