The ice probes make maybe a 1 or 2 degree temp difference in a 30 gallon tank. The bigger external unit I havent heard much about, but it doesnt seem like it would be that much more effective than the iceprobes are.
The new DIY chillers are being made out of the $99 home depot AC units. With a decent amount of titanium coil (going to cost +$100) you can cool a large tank pretty efficiently, and with the AC unit being mounted outside, the heat isnt getting added back to the room.
The new DIY chillers are being made out of the $99 home depot AC units. With a decent amount of titanium coil (going to cost +$100) you can cool a large tank pretty efficiently, and with the AC unit being mounted outside, the heat isnt getting added back to the room.