I found swimming in the outdoor pools in January very enjoyable - it was going from and to the changing rooms that was tough :-)
Once inflatable domes could be made strong enough to withstand high winds, a number of outdoor pools fitted them Fall through Spring so that they could be open year-round.
However, the benefit (increase in revenue) from doing that would be more than the benefits (slightly extended usage, and lower heating bills) in TV.
Would be an interesting experiment at one pool - maybe Savannah as that is slightly more enclosed than the newer ones.
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