The right temperature when the hot tub is not in use will make it more efficient and can help you to save a lot of money. There is no reason to keep the water super hot when you do not plan to use it, especially if you are going to be gone and will not use it for a few days or more. A good rule of thumb to consider is that the temperature should be five degrees lower or more when you are not using it compared to when you do use it. The higher you keep the temperature for your hot tub, the more expensive things will get. You need to pay for the electricity while it is on and that is always higher when the hot tub is in use. You can always turn the water back up a few minutes before you plan to get into the hot tub and it will be ready for you to go again. Keeping the temperature a little cooler when you are not inside of it can also help to protect the system of the hot tub. You do not want to completely turn it off or all the cold in the winter may burst the pipes and cause a big mess. But having it too hot is going to cause a lot of problems as well. Going for somewhere between five to ten degrees lower than when you want to use it can make a big difference while saving energy.