Dear All,

I'd like to know the proper method of calculating EER for package units. From what I know, the formula is cooling capacity(Btu/hr)/Power input in watts but what cooling capacity should be taken, nominal or total. The reason I'm asking this is that I have problem comparing units of different brand since some of the suppliers are not suppling nominal capacity data. Thus I cannot compare apple for an apple. Please advice how I should go about this.
Also, if some supplier claims to be supplying units with EER more than 10.0, what certification must the supplier have to back this??

Thank you