Can you run your AC? Maybe add a window unit to the room.
Chillers are heat exchangers, the heats got to go somewhere, so being in the same room is kind of counter productive. If you can keep the room temp down then you can run fans which equals more evaporation and that means more kalk.
I've had a 1/3 hp in line Aqua Logic chiller since 2000. It's hard to beat them for a large tank. Very well built chillers.