Building Indoor Environmental Quality (IEQ) measurements are often complex, time consuming, expensive, and not easily conducted in a manner that covers all commercial building types, therefore evaluating IEQ is not standard practice. This presentation will cover the basic, intermediate, and advanced levels of thermal comfort measurement techniques prescribed in ASHRAE's Performance Measurement Protocols (PMP), which provides users with clear measurement methods and reference standards for evaluation. In addition to a review of the PMP measurement and evaluation procedures, a detailed case study will be presented, including an open-source software tool that helps users collect, analyze, and present measured IEQ data.