What do you consider most important about your air conditioning system? That probably depends on your perspective. If you happen to work for the EPA, it’s energy use. If you’re a facilities manager, it’s reliability. Business owners usually care most about the cost. Employees and customers care about comfort.
In the past, these concerns have sometimes been mutually exclusive. To get the most energy-efficient units, you had to shell out a lot of cash, and in some cases you had to sacrifice some cooling power to get the energy savings. And buying a more expensive system did not necessarily guarantee reliability.