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It’s less expensive to leave your hot tub on all the time, though you’ll want to keep it at a reduced temperature. How much you use the hot tub is also a factor. You’ll want to keep it at a constant temperature between 80 and 95 degrees Fahrenheit for weekly or daily use, then bump it up right before you get in. If you don’t plan to use your hot tub that often, you can turn it off as long as there’s no risk of freezing.  

Most outdoor hot tubs last between five and 20 years, excluding inflatable tubs, which last five to seven years. High-quality, maintained tubs can last decades, while low-quality, poorly maintained tubs may not hit five years. A good warranty, professional installation, quality materials, and proper maintenance will help a tub last longer.

Algae-related green hot tub water is generally safe to use, as algae aren't usually harmful to your health. However, if the conditions in the hot tub are hospitable to algae growth, they may also be hospitable to the growth of other types of microorganisms, including Pseudomonas aeruginosa, bacteria that can cause hot tub rash, or Legionella bacteria, which can cause respiratory illness.

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.