This is a tough issue. You can either fork over a small fortune for a self controling water temp controller and not worry about ambient air temp (got one at work to control the temp of the laser tube, about $8,000), or go with a huge or multiple rads with a thermaly controled fans and "hope" it keeps the water temp conistant. Problem is huge temp swings would kill you and you would still have to maintain a fairly steady ambient temp.
Is there less expensive "chillers" out there? The one I use at work is used to keep the 80watt laser tube at whatever you set the dial to. Now it is set to 23C and it stays at 23C no matter what the room temp is. Room temp swings about 20F from morning to after noon.
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