I am a partner in a 2000 sq ft rental photo studio in Virginia and the building we lease is split 1/3 office and 2/3 warehouse- that's the studio part. There's a separate gas heater in the studio, but there's no air conditioner so in the summer it gets to the upper 80's inside. The office part stays easily as cool as we want (usually between 72 and 76) and I'd like to harness some of the cold into the warehouse. The air conditioner for the office is a big unit in the ceiling with 6 registers and 1 return. I understand that the unit probably wasn't meant to cool such a large area, but mostly I just want to take the edge off. I want to tap two new registers onto the air conditioner through the wall. Will this help at all? Will it help to tap a return in through the wall too? We don't want to get a huge new air conditioner because we're only renting. Any advice?