Unless your plan on turning the hot tub off and completely draining all of the water from every part of the tub, which we DO NOT recommend, there is really no way of turning the tub off during the winter months. If you want to lower the temperature down and keep a healthy environment in the spa we recommend following our vacation plan. You may dispense up to four weeks at a time during the months the temperature of the water has been lowered and you do not plan on using the spa. If you plan to use the spa on occasion during these months it is good practice to maintain weekly service on it.