The Acutherm VAV diffuser product line is thermally activated. An actuator with a phase-change material responds to changing room temperature. Setpoints can be selected by turning knobs hidden behind the diffuser plate. This technology allows for a higher level of thermal comfort controllability to be provided in applications with many thermal zones, without the need for a separate VAV box for each zone. Medical office buildings with exam rooms and commercial buildings with many closed offices are good candidates for this technology. Designers should exercise care when designing these systems though: pressure-independent control dampers are still needed, to keep the pressure seen at each diffuser within a certain pressure range. VAV diffusers do not suffer from dumping issues, as do traditional diffusers, as each diffuser has a plate that moves up and down to maintain a constant discharge air velocity. WRL has sucessfully incorporated the Acutherm product in its Washington DC studio, which was awarded LEED-CI v3.0 Gold in 2011.