USPS HVAC Replacement

Challenge

For the Essex facility, these upgrades were not just timely, they were long overdue. The building’s infrastructure had aged well beyond its intended lifecycle, with many systems struggling to meet the operational demands of a modern, package-driven postal network. Outdated layouts limited workflow efficiency, and older equipment slowed processing times, making it increasingly difficult to keep pace with rising package volumes and service expectations. The need for new package sorting technology was especially critical, as the existing systems lacked the speed, precision, and capacity required for today’s high-volume, time-sensitive operations.

Equally pressing was the state of the HVAC systems. Nearing the end of their service life, these units were plagued by inefficiencies, inconsistent temperature control, and frequent maintenance needs. Their poor energy performance drove up utility costs, while their inability to handle Vermont’s extreme seasonal swings, frigid winters and humid summers, meant both employees and sensitive mail often experienced uncomfortable or unsuitable conditions. These environmental shortcomings posed risks to package integrity, especially for temperature-sensitive items, and underscored the urgent need for a full-scale mechanical upgrade.

Solution

The Delivering for America program represents the most comprehensive modernization effort the U.S. Postal Service has undertaken in decades. Facilities like the one in Essex, Vermont showcase these tangible improvements of faster processing, better equipment, modern vehicles, and enhanced work environments.

The new high-efficiency units, upgraded ductwork, and modern controls now reduce heating and cooling costs while providing consistent indoor temperatures. This is especially critical for today’s package-heavy operations, where climate control helps protect sensitive items such as pharmaceuticals, electronics, and perishables. Enhanced humidity regulation and stable temperatures safeguard mail and packages during storage and processing.

These upgrades also directly benefit the workforce. Improved ventilation and air filtration create healthier indoor air quality by reducing dust, odors, and airborne contaminants in the large processing space. A comfortable, climate-controlled environment supports employee productivity, reduces physical strain, and aligns with DFA’s focus on workforce stability and retention

Finally, the new HVAC systems will help USPS meet federal sustainability and GSA building performance standards, including greenhouse gas reduction targets. Integrated smart controls and building automation allow for real-time monitoring of energy use, advancing both environmental goals and DFA’s commitment to transparency and accountability.

The project began with the removal and responsible disposal of major existing HVAC components. This included twelve (12) rooftop units (RTUs), two (2) gas-fired furnaces complete with DX coils and condensing units, as well as all related gas piping, refrigerant lines, and rooftop curbs. All demolition debris was transported off-site and disposed of in compliance with local and federal regulations. During construction VHV worked under operating conditions set forth by the USPS regarding temperature-controlled facilities. Due to this condition of postal equipment, VHV schedule varied with removal of existing equipment in stages, VHV was only able to remove up to two to three pieces of equipment at any given time to maintain a facility temperature that the facility could not exceed 78 degrees. This was required to maintain the temperature range that postal equipment needed to operate in. Once the equipment was removed and the replacement equipment was installed, VHV was allowed to remove the next phase. This was the theme throughout the duration of the project over the course of 4 months.

The new high-efficiency equipment was installed to modernize and improve the facility’s mechanical systems. Thirteen (13) new rooftop units (RTUs) and five (5) new energy recovery units (ERUs) were set in place, along with one (1) ductless mini-split cooling only system (AC-1) to provide supplemental climate control.

Gas piping modifications were carried out to support the new system layout. Existing gas piping to removed units was disconnected locally and capped as necessary. A new branch line was run from an existing source to serve RTUs 11, 12, 13, and 14, while all other new units were re-piped locally from the remaining infrastructure after demolition.

Sheet metal work included the fabrication and installation of new ductwork, encompassing main supply and return trunks, branch runs, and new diffusers, all in accordance with the project design. All new ductwork was fully insulated to meet specifications. The newly installed ERUs were connected to the duct system, integrated with the building’s controls, and configured to optimize fresh air delivery and energy efficiency.

A critical part of the project was the integration of all new HVAC equipment into the Building Automation System (BAS). This involved connecting, programming, calibrating, and testing all BAS points to ensure seamless control and monitoring. Coordination with the BAS provider ensured full compatibility and optimal performance of the upgraded systems. As part of this project VHV Automation Group was tasked with installing a new Building Automation System (BMS). The new BMS also required BACnet Integration. Once the new components were installed and the BACnet Integration was complete, we designed new web-based graphic pages representing the new system.

Finally, a full test and balance (TAB) procedure was performed on the newly installed equipment and ductwork. This included balancing the main supply and return ducts, as well as all new branch lines and diffusers installed as part of this project.

The completion of this work resulted in a fully modernized HVAC system, delivering improved energy efficiency, enhanced indoor comfort, and reliable performance for the facility.