My husband and I just ordered a Jacuzzi J-480. Because we live in rural upstate NY, we are planning on building an enclosure to help with efficiency and for comfort. We easily get 300+ inches of snow a year! It is going to be 18x18 so we have room for repairs should we need to access the side panels. We are currently debating the number of windows needed and how to ventilate. I don't want it to be too hot to use in the summer! Any suggestions would be greatly appreciated.