Variable capacity technology is a core feature in high efficiency air conditioners available in the residential, ducted market. Residential variable capacity air conditioners are available in a range of Seasonal Energy Efficiency Ratios (SEER), exceeding the federal minimum levels. Energy efficiency program implementers seek to understand the efficiency impact of variable capacity systems for their climates and applications. Program implementers seek guidance on structuring their programs based on available industry ratings. This report examines the performance of three variable capacity systems of varying SEER over a range of real-world operating conditions, away from the current standard testing conditions for SEER.