Yes, they can. Solar pool covers may help increase your pool’s water temperature by approximately 6 – 8ºC over the period of a week. The cover’s material and air bubbles create a greenhouse effect, trapping and retaining the sun’s heat within the pool water. This heat retention helps to raise the water temperature, making the pool more comfortable and extending your swimming season. When used alongside other pool heating methods, such as a pool heat pump, the overall heating system can work more efficiently, resulting in significant energy savings and reduced operating costs.