As we are outside of the USA, ASHRAE 90.1:2010 is a new requirement that came with v4 and our designers have no experience in interpreting and applying the mandatory requirements.

Hi all, Could anyone clarify if Ireland is in climate zone 5A or 5C? Thanks in advance

Can you take credit for occupancy sensors that control HVAC systems? I am thinking probably not for system operation E.g setbacks, agree? But I am unsure for the ventilation.

We have a Green Building Council in Australia that has a very advanced energy simulation methodology that achieves the same outcomes as the ASHRAE 90.1 process outlined in LEED.

Does anyone know wether or not evaporator input power should be included in the efficiency calculation of a VRF system?

Exception c requires that lab spaces use a system 5 or 7 in the same way that exception d does, but exception c does not prescribe any specific turn down during unoccupied periods.

For Data center project, I've supplied the designer team with the Data Center Calculator, so that they'd be able to fill it in with their project data. However, There are some questions in relation

We are running into a situation where the insulation is slightly under the R38 (R34.8) that is required per ASHRAE 90.1 yet the energy model shows we are over 10% energy efficient.

Hi all, This query follows on a similar theme to the previous topic. We are working on an existing building that is intending to improve the envelop performance by internally adding insulation to

Hi, We have project in Pakistan and we had done all measures for LEED certification, but due to some client personal reasons we were not able to register this project with USGBC and now after 1.5