Five fuzzy controllers ( proportional, proportional-integral-derivative, proportional-integral, proportional-derivative, and adaptive proportional-derivative ) were evaluated for building environmental control, including heating, cooling, air quality ( carbon dioxide content ), and lighting. The simulations were performed using a previously developed model. All controllers satisfactorily controlled the indoor comfort requirements, and reduced energy consumption by eliminating overshoots and oscillations. The fuzzy P controller gave the lowest energy consumption. 19 refs.