I have done a few.
the best avenue that I have found is through the Mech Cont.
I have a slight advantage - I 'm in the trade, and know the systems well.
I would go through the people servicing the hi tech equipment. after all you are most likley going to help trouble shoot an issue related to HVAC so why not be on their side to begin with. If you make their job easier they will use you.if you are pointing fingers they will not be to happy to see you.
just my thoughts
Museums are very particular but will pay to preserve their stuff.....I have involve with the mint museum in Charlotte, many times and all related to HVAC
John Cannamela
ASNT II Vibration/ Level II Thermographer
HVAC Journeyman
Owner ISC Building Diagnostics
http://www.infraredsurvey.com www.iscbuildingdiagnostics.com
jc@iscbuildingdiagnostics.com