Energy Efficiency – Not just for pools!
If you have a typical portable spa, your heater will heat water 10 degrees in about 8 hours. If you use your spa once a week, lowering the temperature 3 degrees when not in use will save you approximately 5-10% of your spa heating costs; if you use the spa less often, your savings could be even greater. Don't run the jets unless you are using your spa. The mixture of water and air is great for relaxing the muscles, but it cools the water quickly.
Spa covers are important. Be sure to leave the cover on until you are ready to use your spa and replace when you're finished. Remember that the heat that escapes is the heat you must pay to replace.