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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.

Most hot tubs will experience leaks due to wear and tear in the plumbing or the shell itself. The second most common issue is a heater malfunction due to the ongoing heat stress on moving parts. Finally, clogs happen in hot tub jets, especially when it’s time to change the filter.

Hot tub repairs cost between $200 and $500 on average. You can minimize those costs by maintaining your hot tub and keeping necessary supplies on hand. An elevated shelf in the garage is a great place to store your water care chemicals so that kids and pets will stay safe and you’ll always have them around. 

Your hot tub should be drained of existing water, cleaned, and refilled every three to four months at a minimum. Follow your tub manufacturer’s recommendations for cleaning, and rinse thoroughly when finished to eliminate any residue from the cleaning products. This is also a good time to inspect your tub’s cover in good lighting for any leaks, tears, or other damage that might cause problems. 

Using your hot tub manufacturer’s suggested cleaners and methods, keep your hot tub filters clean to avoid a loss of water heat. This will help extend the filter’s useful life and efficiency. If the filter is more than two to three years old, replace it with a new one and buy a second filter to keep around as a spare.

If your hot tub is well-maintained, covered tightly, and the water is balanced and sanitized correctly, it can remain unused for up to two weeks without significant issues. Beyond this period, the water quality may start to deteriorate, potentially leading to the growth of algae and bacteria. However, it's crucial to note that this timeline can change due to factors like water temperature, sanitation levels, and the quality of your hot tub cover. Regular maintenance and water testing are essential to ensure the water remains safe and clean during periods of inactivity.