Having solar heat would be the best and cheapest option would it not? In an ideal world, it probably would be, however we live in Winnipeg and our climate varies a lot from season to season. Solar systems are prone to leaks from frost, roof damage from leaking water, cooling your pool down at night if the diverter valve is not shut off, and shortened swimming season dependant on the sun. Read more about Solar Heat For Your Pool
You pool equipment plays an important role in the circulation of your pool and the overall quality of the water you swim in. Keeping up to date with your pool equipment is important if you prefer top quality pool water and minimal energy consumption.