Had lunch the other day and sat by a couple of guys who were refrigeration specialists. We talked about walk-in coolers. They said the easiest short term cooler is a 4 by 6 or 4 by 8 portable room made from 2 x 6's with R-30 insulation in the walls. Sheath the inside with the foam board with aluminum foil on it and cool with a 5000 - 7500 btu portable a/c unit. This just might work to hang beef, lamb, pork, deer etc and you sure can run a bunch of electricity for the difference in cost of a commercial unit. What do you think??