Cx Associates commissioned energy efficiency improvements at Burlington International Airport including the upgraded central chilled water system, replacement of two inefficient constant volume dual duct air distribution systems with a VAV system, extensive controls system programming upgrades, and lighting efficiency upgrades. CxA conducted design review for the central cooling plant and air system and heating plant upgrades. Many of our design review comments had a positive impact on system performance, especially part load operational efficiency. We estimate that our design review of the chiller plant controls alone saved the airport 150,000 kWh/year (20% of full load), worth $19,000/year. In addition, CxA worked with BTV to implement Building Performance Metrics and Monitoring to enable the building operators to maintain system performance over time.

Cx Associates provided peer-level design and construction phase commissioning of the mechanical, electrical, and plumbing systems for the YMCA's new, state-of-the-art facility in Burlington, VT. The building is made up of a gymnasium, natatorium, studios, fitness areas, childcare spaces, and offices, and uses water source heat pumps for heating and cooling with rooftop units (RTUs) and an HRV for ventilation. Our work focused on efficiency, first-cost and maintenance cost savings, and ensuring occupants would be comfortable in their spaces. For example, we found a lighting controller that required a fifteen minute wait time before the lights could be re-enabled after shut-down, a potential safety hazard. We worked with the design team and the contractors to find solutions to this and many other issues.

CxA’s commissioning of the multi-purpose, year-round Stowe Arena began during the Request for Proposals (RFP) stage and continued through bidding, design, construction, and occupancy. The RFP development and bidding services helped to ensure that energy efficient design concepts were included in the project proposals from the very beginning. During the design phase, CxA identified many opportunities to improve building performance, such as variable speed control for the desiccant dehumidification system, and optimal hot water supply temperature for boiler efficiency and heat recovery. CxA’s functional performance testing of the installed systems revealed additional opportunities to improve energy efficiency, such as reduced ventilation air pre-heating and adjustments to lighting control settings to more effectively switch off lighting when spaces are unoccupied.

Cx Associates provided Construction and Occupancy Phase Commissioning services for the Rutland Housing Authority (RHA) and Housing Vermont’s multifamily building in Rutland, VT. Working as the independent commissioning agent, we delivered a quality assurance process to help ensure the project meets the High Performance Track of the Efficiency Vermont Multifamily Energy Standards for New Construction. In order to meet this goal, our services for the project included construction verification, functional performance testing, maintaining a commissioning issues log to work through identified issues with the project team, training support for O&M staff, and a review of the systems manual. Ten months after building occupancy, we performed a follow-up visit to ensure that the systems were continuing to operate as designed and installed. 

Cx Associates provided construction phase commissioning services for a Systems Building Renovation for Green Mountain Power (GMP), which included the HVAC and power systems. This project included relocation of the existing data center to the main office facility with extensive commissioning of the installation. In addition, we provided in-depth assistance with the rooftop controls unit and BAS integration. Our focused support helped GMP resolve building performance issues.