Putting the equipment outdoors is totally the way to go if you can do it as it keeps all the noise outside as well as the majority of humidity and general mess. This is very common practice with large expensive tanks, especially in the states.
A large chiller can easily compensate for hot days and if you sealed your equipment you wouldn't require air exchange or a dehumidifier, you may just want a fresh air vent for the skimmer (perhaps this is what people mean by air exchange as it wouldn't make any sense to have both a dehumidifier and an air exchanger).
You'll want some kind of heater in the shed to keep it above freezing in the winter and obviously good insulation will help in both summer and winter months. I'd recommend solid foam as it's waterproof but realistically you can use any insulation provided the vapor barrier is adequate.
I'd also look into adapting a solar water heater into the mix, would probably keep your water warm all year round and offset the power cost for the chiller.
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