Quote:
Originally Posted by john70t
There are retractable pool covers which would keep sunlight and some debris off the water.
An air gap would ensure positive upwards flow of any heat differential: ie pool is warmer than the air.
4 feet below the frost line it's probably about 40-60deg constant which would be a heat sink unless it's insulated.
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We don't have a Frost line. The ground temp here is around 70-80F. And while a retractable pool cover would be nice...it would be extremely costly to install. Would love one!