"Lüumel" direct evaporation heat pumps - experience reports?

@ €uro

since you did not respond to my private message from 11/13/2012, I am asking the question again here:

Do you generally have experience with the company Lümmel?
It is a rather small company that also has its headquarters just around the corner from me.

@ €uro since you did not answer my PM from 11/13/2012, I am asking the question here again: Do you have any experience with the company Lümmel?

Sorry, as a small planning office my "punch" is capacity-wise very limited! Basically, published or transmitted, reliable planning parameters (characteristic curves) are a strict prerequisite for further activity on my part. For the mentioned DV I have no reliable and trustworthy manufacturer information. Therefore, neither a pro nor a con for the individual solution/manufacturer! Whether DV is really effective would have to be examined on a case-by-case basis! Best regards