Building Operating Management, Mar. 2014, by Charbel Farah.
http://www.facilitiesnet.com/hvac/article/Taking-A-Systems-View-Of-HVAC-Upgrades-Can-Lead-To-Bigger-Benefits--14805

A five-part article:
Part 1: Taking a Systems View of HVAC Upgrades Can Lead to Bigger Benefits
Part 2: Refrigerant, Water, Air Leaks Can All Lead to HVAC Problems
Part 3: Economizers, Heat Recovery Can Help Reduce Demands On HVAC Systems
Part 4: How Lawrence Berkeley National Laboratory Used an HVAC Systems Approach to Upgrade
Part 5: Capitol Records Building Upgrade Solves HVAC Issues