We had a commercial client that need to have a server room with controlled temperature. It was crucial that the room stayed at a constant temperature in order to maintain the servers. They choose to go with a Mitsubishi Ductless system. They are super reliable and work great for controlling the temperature in single rooms or areas. These are also great for homes that have hot and cold spots.
It was also very important in this install that we made as little dust as possible to keep from damaging the servers. We were able to take extra precautions to make sure the job was done to the customers satisfaction.