Dunno if you mean that the cost to heat has literally gone up, over the past 2 years OR if you mean that community concern about the cost has gone up.
If the former, you may want to check your heater AND your gas rates. The national trend on gas rates has been down. Your locale (Phoenix) could have some special reason why natural gas is up, there. But, if it's not, you probably should check your heater. Arizona has some truly nasty water, with respect to minerals, and if you haven't been doing everything just right, your heat exchanger could have a nice thick coating of minerals that's doing a good job of insulating the pool water from the heat, with the result that most of the heat goes up the vent.
In that case, you can
+ try to clean the exchanger, OR
+ replace the exchanger, OR
+ get a new hi-E heater.
Otherwise, the black plastic solar heat panels should work very well for you in AZ.
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However . . . I'm not eager to get into a long exchange over the merits of this or that process with folks from an HOA. I've worked with HOA's, locally, and when I'm being paid to do so, it's been worthwhile, but just barely.
In my experience, HOA boards consist of 6 - 10 guys, each of whom thinks at least 1/2 of the OTHER board members are idiots or criminals, and that the remaining members are nice, but a little slow. Working with HOA boards has been a lot like herding cats: it's a lot of work and the results are pretty much the same as if you hadn't been there.
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