- During warmer months, keep the thermostat below 85 degrees Fahrenheit or, better yet, turn it off completely. Because the air temperature is warmer, the hot tub water remains warm, especially when it's covered. During colder months, keep the thermostat set at 102 degrees. Most hot tubs come with a factory temperature setting at 104 degrees, but 102 degrees is sufficient to keep the water at a comfortable temperature level.
- Set the thermostat timer to turn off the heat during peak usage times. Typically these hours are between 6 a.m. and 10 a.m. and again between 5 p.m. and 9 p.m. The tub stays warm for several hours even after it's turned off. Using a cover also traps in the heat, so you shouldn't notice a difference in the water temperature but you should notice a reduced difference in electricity usage.
- Turn off the jets and lights when you are not using the tub. Use the jets less when the tub is in use. The jets force air into the water, which lowers the water temperature and means the heater must work harder to keep the water warm.
- Turn off the power to the hot tub when it's not being used. In the colder months, if the tub is not used, turn it down to the lowest temperature recommended by the manufacturer to prevent the pipes from freezing or drain the hot tub and keep it closed. Clean the filter every time the water is changed to prevent it from clogging. A clogged filter prevents water flow, causing the hot tub to use more energy to operate. Replace the filter when it shows signs of damage or at least about once a year. Keep the hot tub covered with a thermal blanket or an insulated cover. Both keep the heat in the pool and prevent evaporation. Place a windbreak around the hot tub to prevent cold wind from lowering the water temperature. The tub has to work harder to bring the temperature of the water back up. Suggested windbreaks include fencing, landscaping or spa enclosures.