In 2020 I a hand and I built this insulated box so hold the vacuum pump, RO pumps, vacuum releaser, and RO. This prevented them from freezing overnight and eliminated the necessity to carry them in every night and back out every morning. The vacuum releaser is the two white circles on the right. The little heater bottom right stayed on overnight.

The only problem with this system was that my main storage, a 1,000 L IBC, was outside and the plumbing and valves froze up. It was a big improvement but it left a lot of room for improvement.