I have a "stand alone" room off the garage. It is completely self-contained. In the subdivision where I live, several houses have this room and they are mostly used for storage from overflow from the garage. Well I installed a solid-core wood door with a deadbolt lock. At one end I had a loading bench w/cabinets and shelving built. Additionally I bought one of those "diamond plate steel" cabinets for additional storage. I placed a "floor standing portable" A/C unit 15K BTU with the exhaust directed out to the garage. It keeps the room very cool and it blows hard enough to effect the FX-120i scale I use. So early mornings are when I load because I have to shut off the unit. But as far as brass prep etc.. the unit stays on all the time.. Works great..