Under certain circumstances, radiant floor heating systems may lead to system performance efficiencies. However, this is not always the case, nor is it always true that the performance benefits are substantial. The article cited does not indicate building type and operation, and the projected savings may not translate to your building type. In particular, the ventilation rate used in the study will affect it\'s applicability to other building types. Although it is implied that the project will adopt lower air temperatures if a radiant system is installed, there are significant control capability implications to this which may negate the effectiveness of this strategy. Furthermore, cooling and ventilation performance are integrally affected by this system. Finally, the usefulness of the air temperature strategy described will be limited to parts of the heating season, depending on indoor and outdoor conditions, ventilation rates, internal gains and solar loading, occupant densities, and a host of other factors. Due to the complexity of these issues, the strategy proposed to demonstrate \'energy performance\' by correlating it to indoor air temperature is over-simplified, and would not be acceptable as proposed. If the project could demonstrate that the ventilation rate used in the study was the same as the ventilation rate of the proposed building, some limited adjustment to indoor air temperatures might be acceptable. The project would need to demonstrate that the control system is specifically configured to achieve this goal, and that seasonal variations are accounted for. The performance improvements would need to be specifically evaluated in a building energy use model that complies with the ASHRAE 90.1 energy modeling protocol. Applicable internationally.