If you have colder temps headed your way, here are some tips from fellow Dustless Blasters about blasting in below freezing temperatures.
At 32°F add rubbing alcohol to the water tank at roughly a 1:100 gallon ratio. The colder it is, the more alcohol you will need to add, up to 1:20 ratio.
Create a tent around the pot, pump and moisture separator, perhaps by throwing a tarp over them. You can partially tent over the air compressor too, but be careful not to block the exhaust vents. The ambient heat from running the compressor will keep everything warm. You could also place a small electric space heater inside, but use caution.
If you can, move inside.
When finished blasting, be certain to empty tank and blow out hoses to keep them from freezing up.