Another option is to use tape heaters (frost protection) with built in thermostat. And insulation!
https://www.ezeheat.co.uk/product/fre-e ... eater-kits
230VOLT from this supplier!! many others to search for.
I bundled the tape around the tube supports cable tied in position so mainly under the tube.
Stopped the tube freezing but the chiller froze and ice pushed the tubes off the chiller output! perhaps add some tape to the chiller?
'Winterizing' advice
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Mike Tuppen
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Dave Vigness
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As long as you get some flow you are good, it's not like you're trying to suck heat out of a hot laser tube, just keep it above freezing. Don't forget to check both directions. It should be open both ways if it is at all, but you never know what some designer might do that would give you better free flow one way vs the other.