HVAC System Upgrade at Fairchild AFB

About This Project


The 92nd MDG clinic at Fairchild Air Force Base needed to increase their energy efficiency and bring existing air handling units (AHU) into compliance as the return air system was using life safety egress corridors to send air back to the AHU instead of using duct work. Kroeschell competitively bid the project to their prime contractor partner and was selected to complete the HVAC changes.


Kroeschell performed the following upgrades:

  • Replaced one (1) AHU and installed an additional AHU
  • Installed an Energy Recovery Run Around Loop
  • Replaced the cooling system for the IT Systems Room and the Main Communications Room

The old AHU (rated at 21485 CFM) that was used to service the Family Medicine Area on the first floor was removed and replaced by a new AHU (rated at 18425 CFM), which now serves the basement. The entire basement air distribution system was converted from four pipe fan coil units with general exhaust to a VAV system with duct return air system. A second AHU (rated at 27915 CFM), was installed in the basement and now feeds the Family Medicine Area on the first floor. In order to accommodate the new AHU, Kroeschell built a new mechanical room in the logistics warehouse of the basement.

Additionally, Kroeschell installed an energy recovery run around loop for an existing AHU to reduce energy consumption. This involved installing a water coil into the air intake of the AHU and another coil into the general exhaust duct near the building general exhaust fan. These coils allow the system to recover energy that had been put into the building and use it to preheat/precool the incoming air.
Kroeschell was tasked to replace the cooling system for the IT Systems Room and the Main Communications Room. The existing systems had no backup redundancy and were unable to maintain proper temperatures. New Liebert Data Room Cooling Systems were installed, which operate on both chilled water and a DX backup. This backup ensures that the rooms are never without proper cooling.


By performing the bulk of the project at night and on weekends, Kroeschell was able to make major HVAC equipment and distribution changes in an active medical clinic without requiring the clinic to shut down and thereby avoiding impact to the 92nd MDG’s mission. The upgraded systems are now compliant with ASHRAE 62.1 and 90.1.

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Customer Profile

The 92nd Medical Group (MDG) is an outpatient clinic that offers a dedicated primary care team approach to help prevent illness, treat injuries and promote healthy lifestyle changes for more than 11,000 beneficiaries, including active duty members, retirees and their families. Medical and dental care is provided in partnership with an expanded referral network of health care providers.


Government, MEP Design-Build Engineering