I need a source of cold air for an application I'm designing. What's the easiest and simplest way to achieve this?

I cannot use freeze spray since tetraflouroethene is heavier than air and can displace air in the lungs.

I cannot use any gas that depletes the ozone layer.

I cannot use any gas that is toxic or have any harm to humans.

The temperature of the gas coming out of the tank (or canister) must be colder than -10 F

The gas must be able to be stored in a tank/canister in liquid form for a significant amount of time without must leaking and has no pressure problems as long as the ambient temperature is not too hot.

Any gas that satisfy all those requirements? Thanks a bunch.