Greetings - my suggestion is to determine exactly what temperature your bottled gas will be stored at. Then contact your local gas supplier, AirGas for example, and ask them if whatever gas you need can be stored at the particular temperature you determined.
You may not need any special refrigeration equipment at all. And, if you learn your gas cannot be stored at whatever temperature you determined, then you need to rethink your plan and store your gas bottles in a different location.