The perfect water temperature in your pool is important for comfortable swimming and for safe use. Many pool users enjoy swimming in water between 75 and 85 degrees Fahrenheit, depending on the weather outside and the amount of physical activity going on. There are many ways to warm up your pool’s temperature, including solar, natural gas, and propane heaters. On the flip side, pool owners who live in warmer climates may want to use pool cooling systems to keep their dips brisk and refreshing. No matter what kind of fuel it uses, a pool heater works by heating up the water within the heater and then releasing it back into the pool, gradually raising the temperature.