This guide addresses single- and multifamily dwellings, unrestricted by building size or HVAC system type. Written by experts in residential IAQ, it represents best practices to achieve excellent indoor air quality. It provides information and tools that residents, home designers, and builders can use to integrate IAQ into dwellings while addressing budget constraints and other functional requirements. This guide presents the best available information to allow informed decision-making by anyone involved in designing, building, buying, or renting residential space, with eight objectives and detailed implementation strategies for improving IAQ.