Aetna’s Headquarters

Effective. Efficient. Excellent.

As part of Aetna’s participation in the Connecticut Energy Efficiency Fund (CEEF) Retro-Commissioning Program, Colliers Project Leaders was retained to provide Aetna’s Home Office in Hartford, CT with a building survey, retro-commissioning investigation, implementation services, training, and measurement and verification for four buildings encompassing 1,800,000 square feet of office space.

• The objectives of the retro-commissioning initiative included:
• Improve overall energy consumption and operating performance
• Improve the building's ENERGY STAR rating
• Identify system operation, control and maintenance issues
• Reduce occupant complaints and improve indoor environment
• Develop persistence strategies to ensure improvements stand over time

As a result, we proposed the implementation of the following energy conservation measures:

• Optimization of secondary CHW pumping station
• Enhance tertiary CHW pumping station
• Upgrade 8 large AHUs and add pressurization control for the Rogers Building
• Improve controls for 7 snow melt systems
• Improve controls & sequences for the steam boiler combustion air system
• Add DDC seasonal "shut-off" control for existing heating PRVs
• Enhance existing perimeter fan coil unit operation
• Optimize 8 atrium building AHUs
• Modify kitchen and dining area AHUs and correct air pressure imbalances
• Add O2 control for existing steam boiler
• Add VFDs to chilled water plant primary chilled water pumps