I have a single speed pump and run it twice a day for 2-3 hours each in the summer. You can get a rebate here for upgrading to a 2 speed motor/pump but they are pricey at over $1K. It seems the idea behind a 2 speed pump is that it can be run for longer periods of time at a lower cost and improves water circulation. I too would like to hear the skinny on motor options.
Out west now the natural gas prices are low and is used to heat spas and some pools. Solar collectors are also used for early opening and late season use.
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