Dave,
I made myself a blanket from bubble wrap as Andy also suggested and this makes a huge difference to the heat loss during night time. It even increases the temperature during day time as well.
I simply took the widest wrap I could find and asked my wife to sew the strips together. I then put the whole sheet in the pool and cut it to shape and size. Works wonderful.
This is now the second season and it still looks fine and the cost is minimal.
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