Yes, using a solar pool cover in conjunction with a heat pump pool heater is highly recommended. A solar cover helps retain the heat in the water, reducing heat loss due to evaporation, especially at night or during cooler weather. This can significantly improve the efficiency of the heat pump by reducing the workload required to maintain the desired water temperature. Combining both methods can lower your energy costs and extend the swimming season, making your pool more enjoyable and economical to operate.