Build your own LOW budget walk in meat cooler for processing.
A feller I know in Mo. built one inside a portion of his big metal shop building. I will get the details of the components used but basically he bought a decent size window shaker A/C unit and modified the mechanical control system with low cost commercial cooler parts. He can cool it down VERY WELL such as under 50* in summer.
I will be getting the specifics shortly (may be a day or 4) to share.