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  • 1.  HVAC systems with object handling/collection care

    Posted yesterday

    Good morning, 

    Our museum is completing an HVAC update and replacing the unit in the gallery that serves our traveling exhibition program. We are working through due diligence now. Our mechanical contractor is proposing replacing our current electrical system with a gas system. Does anyone have experience with HVAC updates and using gas powered systems in areas where objects are on display? Any concerns or challenges I should anticipate? 

    Thank you!



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    Kim Henze
    Director of Museum Operations
    The Durham Museum
    Omaha NE
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  • 2.  RE: HVAC systems with object handling/collection care

    Posted 3 hours ago

    Good morning, Kim, 

    That would be a resounding no. Here are a few reasons, 

    Combustion Pollutants: Gas furnaces can leak or emit nitrogen dioxide, carbon monoxide, and unburned hydrocarbons, which chemically degrade paper, canvas, and pigments. [1, 2]
    Moisture Fluctuations: Traditional gas heating can cause rapid relative humidity drops during activation, risking wood cracking and canvas tension tears.
    Vibration and Noise: Mechanical rumbling from older gas-fired equipment transfers micro-vibrations through structural walls, risking fragile sculptures or plaster works.

      Electric systems are much better alternative, 

      Electrification: Institutions increasingly replace gas infrastructure with precise, all-electric systems or ground source heat pumps.
      Advanced Filtration: Multi-stage chemical and particulate filters scrub trace atmospheric gases before air reaches the gallery.
      Microclimates: Sealed display cases utilize passive dampeners to decouple local artifact security from general building mechanical failures
      We use an electric controlled cooling tower system at the Bechtler Museum. That system is combined with a humidification system. Both systems are computer controlled and monitored 24/7. Having the 2 systems allows a consistent temperature and humidity to maintained. Our climates may be slightly different but the extremes have the same affect on our buildings. Keep in mind your contractor is probably not aware of collection care needs. 


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      Claude Harding
      Security and Facilities Manager
      Bechtler Museum of Modern Art
      Charlotte NC
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    • 3.  RE: HVAC systems with object handling/collection care

      Posted 13 minutes ago
      Edited by Kathleen Fitzpatrick 12 minutes ago

      Kim,  Good afternoon. I shared your questions with our museum engineering design team and they have provided the following response based this assumption: they are replacing an existing rooftop unit that uses DX cooling to cool and an electric heater for heat with a similar unit that uses gas to heat instead of electric resistance.   (please correct us if this is incorrect)  We are happy to offer a peer review if that is of desire.   Our initial thoughts are:

      1.  Make sure the unit has a modulating hot gas reheat coil that ensures you can reheat the cooler air without using the gas when you need to dial in humidity control.
      2. Make sure the gas furnace they use is an indirect, modulating type with above average turndown. The indirect part keeps the flames out of direct contact with the air so you don't bring any products of combustion into the space itself. Then the modulating part allows for better control of the temperature leaving the unit. A 20:1 turndown is a good ratio to aim for without knowing more about the system.
      3. This isn't something we should say unless you happen to know the person well enough: I would not be replacing a unit that serves an exhibition space with only a contractor involved. They should really have an engineer to help protect them from any decisions the contract may try to make.



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      Kathleen Fitzpatrick, Principal
      Cultural + Performing Arts
      DLR Group
      kfitzpatrick@dlrgroup.com (602) 8283723
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