Solving engineering problems sometimes depends on detailed quantification. Many such problems can be solved readily, even without quantification, once their existence is known. Over a one-year period, Western Electric evaluated one qualitative thermographic system for screening of problems in roofs and electrical systems. The surveys were provided at the corporate level to support in-house engineering, and to focus maintenance efforts at specific locations. Limited-scale evaluations have been performed of building envelopes with favorable results. The portability, simplicity of operations, and low instrument cost have figured heavily in performing surveys at geographically remote locations. Key factors to successful applications are operator understanding of thermography, equipment limitations, systems to be surveyed, and the acceptance by end users of the operator's interpretations.