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Solar Covers heat your pool in two stages: first by absorbing solar energy to heat the pool, and then by retaining the heat to keep the water warmer longer. The small bubbles on the Solar Cover are filled with air that heats up when the cover is in the sun.
You can expect to swim an extra month at the beginning and end of the season. They will raise the water temperature by about 10 degrees. A solar cover is a must for using any other type of heater because they help heat the pool by day and prevent heat loss by night. The next options are solar panels. Your filter pumps water through the panels and back into the pool. The bigger the pool the more panels you will need. The panels can be mounted on the ground or on a roof. The most expensive way to go is the electric or natural gas heaters.