Hi I'm new to the site. I age my deer in a 25-cubit ft. freezer. You can use a new or old freezer. You will have to get a freezer external temperature regulator. I set mine on 34 deg., It will go between 32 and 36 deg. Check this site. Crossfire & KegMan Products.
www.kegman.net/9025.html
www.kegman.net