I have a small window unit in my Hawk installed by the previous owner, I think it's 4 or 5k BTU, it does a good job and it has a very low noise level . I don't mind the daytime heat, but I like a good nights sleep and if you're going camping in the south(Texas for me) in the summer, it helps. I prefer not using it and once the cool weather gets here the cover stays on till next summer, but it's sure nice when the heat and humidity are up.