Steven Winter Associates, Inc. provides research, consulting and advisory services to improve commercial, residential and multifamily built environments for private and public sector clients. The firm specializes in energy, sustainability and accessibility consulting as well as certification, research & development and compliance services. SWA subscribes to a whole building approach, that is, that all building systems are considered integral to building performance as a whole. Design, engineering, construction, material selection, accessibility issues, HVAC control strategies, and energy efficiency can each affect comfort, durability, performance and affordability.