We have a gas heater with a solar blanket to keep the heat in. We use our 16x30 pool all year, as long as the air temperature is in the upper 70s or higher. When the temperature is going to be below that for an extended period of time, we turn the heater off. If we see we will be having a run of warm days, we turn it on to 80. We just got our gas bill for last month - $139.
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