It can cost a few hundred dollars to heat a pool per month, depending on the size of the pool, the climate, and the type of heater. In general, it costs more to heat a pool in colder climates than in warmer climates. And it costs more to heat a pool with an electric heater than with a gas heater.

It costs about $200 per month to heat a pool using electric heaters. Natural gas heaters are cheaper, but propane is more expensive.