PSC M1NB

Overview

The Product Service Code (PSC) system standardizes how the U.S. federal government classifies products and services purchased through contracting. PSCs recorded in FPDS/SAM identify “what” was bought, support spend analysis, and enable consistent reporting; the PSC Manual on Acquisition.gov maintains and documents the codes and their use. ¹

PSC M1NB is listed in the PSC Manual as “Operation of Heating and Cooling Plants” and is used to record contract actions where the predominant effort is operation of heating and cooling plant facilities. The Manual lists the code name under Category M (Operation of Structures/Facilities) but does not provide an extended, itemized “Includes” list for M1NB. ¹

• See also on G2X:
  • M1NB
  • Z1NB
  • Y1NB

What this PSC covers

• Operation of heating and cooling plants — Not specified by official sources ¹.
• Central utility plant operations (boilers, chillers) — Not specified by official sources ¹.
• Fuel handling and plant combustion management — Not specified by official sources ¹.
• Thermal-energy distribution and building interfaces — Not specified by official sources ¹.
• Plant control systems, monitoring, and energy-management tasks — Not specified by official sources ¹.
• Emergency operations and continuity-of-service for plant systems — Not specified by official sources ¹.

Related NAICS and PSC codes

Type	Code	Descriptor
PSC	E1NB	Purchase Of Heating And Cooling Plants
PSC	X1NB	Lease/Rental Of Heating And Cooling Plants
PSC	Y1NB	Construction Of Heating And Cooling Plants
PSC	Z1NB	Maintenance Of Heating And Cooling Plants

(All related PSC descriptors verified in the PSC Manual listing for heating and cooling plant codes.) ¹

How contracting officers record M1NB in FPDS

FPDS requires selection of a single Product or Service Code in data element 8A that best identifies the predominant product or service procured; PSC selection should reflect the primary contract value and purpose. The FPDS data dictionary confirms PSC codes are drawn from the PSC Manual and that contracting officers must choose the code representing the majority of contract value. ²

Frequently asked questions

• What does PSC M1NB specifically mean on a contract award?
  It identifies the predominant contracted service as operation of heating and cooling plants. The PSC Manual lists the code name “Operation of Heating and Cooling Plants” but does not provide a detailed “Includes” list for M1NB. ¹

• When should a contracting officer use M1NB versus Z1NB?
  Use M1NB when the predominant contract performance is operation of plant facilities; use Z1NB when maintenance is the dominant effort. FPDS guidance directs selection of the code representing the majority of contract value. ²

• Are there NAICS codes directly tied to M1NB?
  The PSC Manual establishes the PSC taxonomy for FPDS; specific NAICS crosswalks are managed separately and the Manual does not publish a single required NAICS mapping for M1NB. Not specified by official sources. ¹

Useful resources

• PSC M1NB — G2X overview
• PSC Manual (Product and Service Code Manual, April 2025 PDF) ¹
• FPDS‑NG Data Dictionary — Product or Service Code (element 8A) and selection guidance ²

References

1. Product and Service Code Manual (PSC Manual, April 2025 PDF). https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf

2. V1.4 FPDS‑NG Data Dictionary — Product or Service Code (8A). https://www.fpds.gov/wiki/index.php/V1.4_FPDS-NG_Data_Dictionary