Raised in Dallas, swimming family here w/HS captains, Aggie Waterpolo guys
Wife & I lifeguards/WSI and always caring for a pool somewhere.
Ergo why we don't have a pool now (+ college for 4 expenses).
Dallas can have a short swim season all righty but that's when kids are in school/sports/homework/etc. so better have pool square ends for an adult lap swimmer to demand heat, me thinks and your town should have more public lap swim times than mine/Aggieland.
If heat is justified, then Solar has done this for decades in Dallas, that began with black bladders topping garage roof shingles. Add to that gas heat if needed. Am not thinking heating Dec-March ....
If already doing self-maintenance, judge how much more the heating portion will add to that time/expense and if you can jettison the heat if it falls out of favor/use later on.
SPAs come with many stories, some tired of them after 2-3 years, others got too old/cardiac to use them, others a regulars and even got a prescription/tax credit for his, as I read on this forum recently. You might search that thread. As for me, IF we added one, it would be as portable & saleable as a boat & fully automatic, able to drain it EZ ala Mexican resort pools.
Let us know and brag a little later?
Ten words or less ... a goal unattainable