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For a fully-foamed hot tub, freezing typically occurs when the temperature drops below 28 degrees Fahrenheit and remains at or below this level continuously for a minimum of 36 hours. If your hot tub and pumps are still operational, however, the water circulates, and this continuous movement helps prevent freezing, even in very cold conditions. This circulation, along with the insulation provided by the foam, helps maintain the water temperature and prevent it from freezing during extended cold periods. Still, if you’re not planning to run it regularly, be sure to winterize the hot tub properly to prevent damage from freezing.

The general rule of thumb is to lower it by about five degrees when you know you’re not using your hot tub for an extended period of time. With only a slight decrease in temperature, it will be easier to increase it to a desirable level when you’re ready to get back in the water instead of starting from scratch.

To refill a hot tub after winter, start by opening up the tub and giving it a quick cleaning. If you use antifreeze, drain out the water then grab a hose and thoroughly clean the tub shell out, spraying water into each jet of the tub. 

Reconnect the hot tub and turn the power back on. When it’s time to fill the tub again, insert the hose into the filter well (if available). Avoid trapping too much air in the water lines, which can cause the pump to lock up when it starts again. Add the necessary chemicals and start the heating process. It will take some time—most of a full day—for the water to heat up again.

Hot tubs don’t necessarily add value to a home—but they don’t take it away either. It depends on the potential buyer. A well-landscaped in-ground hot tub is attractive to buyers who prioritize relaxation and fun. Others would rather not deal with the maintenance.