First the pool specs 32 ft x 10 ft x 4.5 ft approx (about 10,000 gals), white plaster.
Latitude 21.18 degrees, Solar noon today is 12:22 pm.
Average daytime temperature 78 F (10 am to 3pm), night time 68 F to 70 F in December, slightly lower in January and rising again after February.
In December, assuming a relatively clear and sunny day and low winds 2-5 mph (rare where I live), is it better to have the clear bubble pool cover on or off, between the hours of 10am to 3pm, to boost the temperature.
The reason for asking this question is to reduce the heat pump run-time.
Any help would be appreciated.