The only people who consistently enjoy swimming in a 70 degree pool in May are 11 year old boys, and residents of Maine who think they are having a heat wave when the water at the beach gets up to 60! For most others, 75 is comfortable for many under FULL sun; but it has to be 80+ before most people enjoy a pool on an overcast day.
Those are pretty much the 'people' parameters you have to work with. Now for the water ones. You want 10 degrees of heat; that's a lot.
Solar heating systems -- the flat black poly panels -- might give you that . . . if you have sunny days, well placed panels, cover the pool at night, don't circulate the water through the panels at night, and so on. And such a system might only cost you a few hundred dollars . . . if you install it yourself (correctly), and get a good deal on the panels, and have a fairly small pool.
But, when you're asking for 10+ degrees of reliable (can-count-on-the-pool-for-the-party-plans) pool heat, you're asking for a lot.
Al (Poconos, one of the moderators) can probably come up with something that will work, but it will take a lot of tinkering.
BTW, if you have an inground pool, and paint it with Viking Blue epoxy, that's probably good for 3 - 5 degrees in a typical May.
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