swim pool buildings

I have my own lap pool in my yard that is 25 yards long and 2 lanes wide(16 feet). It has a concrete deck around it. Currently I can use it May through September, or 5 months of the year, but I would like to use it year-round, so I need to enclose it. Can anyone recommend a builder or designer who knows about building a swim pool building, and also someone who knows how to heat it during the cold months(economically)? I am in northeast Alabama, and my pool does get too cold to swim in starting in October. I do want someone knowledgable and experienced in this particular field, not just any builder. Any leads will be greatly appreciated BobC.