ntsqd
Heretic Car Camper
Prime advantage of CO2 over N2 is that CO2 undergoes a phase change to liquid at it's normal bottle pressure. N2 does not, it's still a gas - a highly compressed gas, but still a gas at it's normal bottle pressure. So any given size tank will hold much more cubic feet of atmospheric pressure CO2 than it will of atmospheric pressure N2.
I've seen CO2 regulators freeze off in Baja in November while using air tools. It was relatively cold for that year's race, but nothing like the Right Coast kind of cold. I'd guess high 30's-low 40's at the lowest. The team's fix for that is several bottles. In a pit stop we can't wait for the regulator to thaw, so everyone uses the same air hose QD's and the hose gets moved to the next bottle.
I've seen CO2 regulators freeze off in Baja in November while using air tools. It was relatively cold for that year's race, but nothing like the Right Coast kind of cold. I'd guess high 30's-low 40's at the lowest. The team's fix for that is several bottles. In a pit stop we can't wait for the regulator to thaw, so everyone uses the same air hose QD's and the hose gets moved to the next bottle.