Abstract: An apparatus and method for monitoring operation of HVAC units associated with cell towers has a plurality of sensors sensing operating parameters of the HVAC units and communicating the data via a wireless data logger to a computer programmed to analyze the data to predict impending out-of-range operating conditions and warn a user. The analysis may be by pattern recognition and/or rules. The system may generate prescriptive measures to remedy expected degraded operation and is applicable to any number of cell tower installations.