No, I know for sure with Disney, you cannot use their pools unless you are staying at their resort... & you can only use the pool of the resort you are at unless it has a sister resort.
To be honest, I do not know of any hotel/motel that lets people use their pools unless they are staying there. That is part of what you pay for.
If you want a heated pool, you can always go to one of the Water Parks in Orlando. There are the Disney water parks (Typhoon Lagoon & Blizzard Beach), there is the one at Sea World (Aquatica) and then there is the original of them all, Wet & Wild on International drive. All of them have heated pools and you can purchase a one day pass.