I am working on a pretty compact mini-kegarator build but one of the snags I have run into is the compressor. Its the largest individual piece of the build and I can not use 2 compressors. I figure theirs some pretty smart people here so if anyone has an idea I would love to hear it.

The idea is that the refrigeration unit requires constant cycling to use a condenser and evaporator in order to create cooling. But I also want to use the same compressor to compress air and create pressure in the mini keg so that it flows to the tap. My question is if anyone knows of a way to do this without running a separate pneumatic motor. So basically I need to figure out an efficient way to maintain a PSI system separate from a system thats running constant working pressure with only 1 input.