Ansoitgoes, what is the distance between your halides and the water? if you keep a fan blowing across the space between them, it usually does the trick. I'm surprised to read that opening the windows doesn't help with the heat especially at this time of the year.
Another thing you want to check is your thermometer. What brand is it? Hows does its readings compare to your residential thermostat?
Otherwise I would suggest to learn a way to control the heat now before summer comes along..... otherwise you may get 50g of undercooked seafood chowder in July.
