PSC Z1NB: Maintenance of Heating and Cooling Plants
Z1NB is the product and service code (PSC) federal agencies use for maintenance of heating and cooling plants, in the maint, alter, repair buildings group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 5
Open contracts with PSC Z1NB, due soonest
- Cooling Water System Repair and Reliability Project
Due in 11 daysOct 20, 2026
- HVAC REPAIR JV RESOURCE_JORDAN VALLEY
✦ The Bureau of Land Management (Oregon State Office, Portland) wants a small business to replace a failed 2.5-ton heat pump system at the Jordan Valley Guard Station in Jordan…
Due in 14 daysOct 23, 2026
- DCDO - HVAC Maintenance
✦ The U.S. Air Force 18th Contracting Squadron at Kadena AB wants HVAC maintenance service for the Defense Communications Detachment Okinawa (DCDO) in Okinawa, Japan.
Due in 16 daysOct 26, 2026
- NHTIC HEATING COOLING PUMPS 2026
✦ The Bureau of Land Management wants four heating and cooling pumps, their motors and five variable frequency drives replaced at the National Historic Trails Interpretive Center…
Due in 16 daysOct 26, 2026
Where Z1NB sits in the PSC Manual
- Category: Service
- Group Z: Maint, Repair, Alter Real Property
- Group Z1: Maint, Alter, Repair Buildings
- Code Z1NB: Maintenance of Heating and Cooling Plants
NAICS codes used with PSC Z1NB
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with Z1NB most often:
| NAICS | Industry | Spent, last 3 years |
|---|---|---|
| 238220 | Plumbing, Heating, and Air-Conditioning Contractors | On 4 open |
On open notices right now, the most Z1NB work comes from Dept of Defense, Department of the Interior and Department of State.
Related PSC codes
- Z111 Maint – Rep – Alt/Office BLDGS
- Z112 Maint – Rep – Alt/Conf Space & Fac
- Z119 Maint – Rep – Alt/Other Admin BLDGS
- Z121 Maint – Rep – Alt/Air Traffic Towers
- Z122 Maint – Rep – Alt/Air Traffic TNG Fac
- Z123 Maint – Rep – Alt/Radar & Nav Fac
- Z124 Maint – Rep – Alt/Airport Runways
- Z125 Maint – Rep – Alt/Airport Terminals
- Z126 Maint – Rep – Alt/Missile Systems Fac
- Z127 Maint – Rep – Alt/Elct & Comm Sys Fac
Frequently asked questions
What is PSC Z1NB?
Z1NB is the service code in the federal Product and Service Code (PSC) Manual for maintenance of heating and cooling plants, under Z (Maint, Repair, Alter Real Property) and Z1 (Maint, Alter, Repair Buildings). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC Z1NB?
Most federal contract dollars under PSC Z1NB go with NAICS 238220 (Plumbing, Heating, and Air-Conditioning Contractors), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC Z1NB?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. 5 open notices use PSC Z1NB right now. FedReady can match new ones to your business and email you, free.