I have done a lot of research lately on mini split systems, but I have been unable to find an answer, hoping someone has dealt with this. Let's say you have a 24x30 shop, in the shop you have a 8x10 office. Without buying 2 head units (18,000/9,000 btu), how would you go about having the heat/AC into the office space with just the 18,000 btu unit.