Re: COLD smoke.
Just don't connect your hookah hose while the motor is running.
You live in portland Oregon and smoke in the garage? Why not walk a few feet outside, its very dry air, you'll taste the shisha better, probablyhave a mountain view and you can pack snow around the bowl to make it cold and keep it from falling over.
Or buy long pvc hose, sit in your garage with the door open a bit and your hookah outside.