Horizon Mechanical Services LLC

Horizon Mechanical Services LLC Air Conditioning Heating Refrigeration Division, a minority-owned, Black American-owned small business based in Upper Marlboro, Maryland, provides HVAC, refrigeration, and mechanical equipment maintenance and repair services to federal agencies as a prime contractor exclusively — all eleven awards in the source record are prime awards with no subcontract work. The company operates under a Total Small Business set-aside posture across most recent procurements and holds DOT-certified Disadvantaged Business Enterprise status, with SAM.gov registration dating to 2005.

The vendor's capability portfolio centers on preventive maintenance, emergency repair, and condition-based sustainment of HVAC systems, commercial refrigeration equipment (including Vilter chiller units and air handler units), and specialized mechanical equipment at federal facilities. Representative work includes a $165,745 purchase order from NASA's Shared Services Center (awarded October 2026, extending through August 2028) covering preventive and emergency maintenance for 37 HVAC units, 46 Keurig coffee makers, 23 ice machines, and associated water heating equipment at NASA's Upper Marlboro headquarters facility; a $244,428 purchase order from the National Institute of Standards and Technology (awarded June 2025, extending through June 2028) for scheduled preventive maintenance and repairs to a Vilter chiller, air handler unit AHU-15, and environmental chamber at NIST's Gaithersburg campus; and a $53,335 award from NIST (awarded May 2024) for biannual chiller and environmental chamber maintenance.

Customer concentration is fragmented but anchored by technical research and facilities-operations agencies. NIST leads by potential value at $298 thousand across two awards; NASA Shared Services Center follows at $166 thousand; the Office of Naval Research accounts for three awards totaling $70 thousand; the National Oceanic and Atmospheric Administration holds two awards worth $34 thousand; and the Smithsonian Institution, GSA National Capital Region, and Department of Justice Bureau of Prisons account for the remainder. The top five customers by potential value represent 97% of all awards.

Activity is sparse and irregular — two awards in 2022, then single awards in 2023, 2024, and 2025, with two awards resumed in 2026 — indicating a small, episodic federal footprint rather than sustained pipeline. Combined potential value across all eleven awards is $599 thousand, with $273 thousand obligated to date. Three awards (combined potential value $287 thousand) reach ultimate completion within the next twenty-four months and therefore face recompete exposure. The vendor competes under NAICS 811210 (Electronic and Precision Equipment Repair and Maintenance) and related plumbing and HVAC contractor codes, with PSC codes reflecting equipment maintenance and repair and professional engineering support work.

Horizon Mechanical Services, LLC is classified as a small business according to the statutory requirements set forth in State Finance and Procurement Article Subsections 14-501 - 14-505, Annotated Code of Maryland and our company holds MBE certifications under MDOT and SWAM. Horizon Mechanical Services LLC is a commercial air conditioning, controls, and heating service establishment. We specialize in service, commissioning, new equipment startup, maintenance and repair of York and Trane centrifugal chillers, computer room air conditioning units, VRF systems, and 100% outside air systems.

Horizon holds pride in the fact that our clients are satisfied and we strive to resolve issues at hand as responsively and diligently as possible. VFD's building HVAC DDC controls and mechanical construction projects to include retrofitting of existing building mechanical systems.