U.S. Department of Energy - Energy Efficiency and Renewable Energy

Federal Energy Management Program

New and Underutilized Technology: Thermal Displacement Ventilation

The following information outlines key deployment considerations for thermal displacement ventilation within the Federal sector.


Thermal displacement ventilation provides slightly cooled air into the space at relatively low velocity, either through a raised floor system or wall diffusers near floor level. These are combined with a 100% outside air system and can provide heating.


Thermal displacement ventilation is applicable for hospital, office, school, and auditorium applications.

Key Factors for Deployment

Thermal displacement ventilation performance is highly dependent on climate, building type, occupancy characteristics, and system design. It has been effectively used in school applications.

Ranking Criteria

Federal energy savings, cost-effectiveness, and probability of success are ranked 0-5 with 0 representing the lowest ranking and 5 representing the highest ranking. The weighted score is ranked 0-100 with 0 representing the lowest ranking and 100 representing the highest ranking.

Federal Energy Savings Cost Effectiveness Probability of Success Weighted Score
0.3 5.0 4.3 50