I am new to this board so bear with me if I ask some "stupid" questions. I love fish aquariums but don't currently own one due to temperture concerns in my home. I know there are heaters available to keep the water warm during cooler weather but want about keeping the water at the proper temperture if it's too hot? I do not have central air, only window units and I do not like to run them when I'm not home. I live in Texas and it gets very hot and humid here, especially during July and August. There are aquarium heaters so why isn't there aquarium "air conditioners"?