Co2 is as good or better than Air in some applications were electronics are not involved.
For instance My blazer is setup with dual regulators and an anti-syphon Co2 tank set for MY blazer. It works +-5 FPS even in cold weather (below 32 degrees) or hot weather (above 90 degrees) The marker is also set to run at around 350 psi so even in the winter when the Co2 tank has a lower internal pressure it doesn't matter.
With the two regulators I can also keep all liquid out of the blazer and have almost no problems at High Rates of fire for extended periods. The stabilizers of course get cold but the marker does just fine on it.
Now your probably saying for the cost of two stabilizers and an anti-syphon Co2 tank that HPA would be easier and even cheaper way to go. That may be so but Co2 has much more potential energy, you need a bigger HPA tank with Higher pressues to even equal the amount of shots a Co2 tank will give you. This translates into longer playing time and less time standing for a refill.
overall, untill you get that marker that NEEDS it (like the electronic/solenoid thing again) Stick with Co2 and adapt your marker to make it work best for you.
Co2+Regs>HPA

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