Use a pool cover. Using a pool cover not only saves energy, it also reduces water evaporation. For a 450-square-foot pool you will save approximately 4,000 gallons annually.
Lower pool temperature. Lowering your pool temperature saves energy and reduces the amount of chemicals required to treat the pool. Additionally, sheltering your pool from winds reduces both heat loss and water evaporation. Decorative landscaping and fencing are creative ways to accomplish this.
Turn off hot tub when not in use. An electric hot tub will cost roughly $4 to heat from 70 to 100°F and then about $1 per day to maintain that temperature. So if you're not going to use your hot tub for the next four days you will save energy by turning it off.
Lower hot tub temperature. Lowering the water temperature of your hot tub can significantly reduce your energy use. Use a hot tub cover. Cover your hot tub whenever it is not being used. This can save you up to $50 per year if you use electricity to heat your tub.