One of the funnies about compressed gas. It is what makes and air conditioner work. The ghas is different but it goes to the compressor to be squeezed and then when it comes back inside it comes back to a gas and is cold where we blow air over the coil.
Colorless oderless and pretty safe unless you let it spray on your skin long enough to freeze it. In most cases, even the really slow thinkers move before that happens!
For type of CO2? Mostly we need the cheap stuff! Enjoy.