Many people are discussing the size difference of 13-SEER (and higher) equipment compared to smaller, lower-efficiency units. They are mainly talking about coils and overall unit size. Some manufacturers are stating that higher-efficiency unitary equipment, on average, can be 30-40 percent larger than its smaller, lower-efficiency counterparts.
Contractors who aren't prepared for the change will find that their storage and transportation space has suddenly shrunk 30-40 percent. The time to plan for the change is now, right now.