Top 100 Contractors in NAICS 3334: Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 3334: Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 36% of FY2021 NAICS 3334 contract dollars

Contract obligations: $303,331,790 Net of deobligations, by contracts coded NAICS 3334 or a code under it
Contractors: 1,210 Parent companies with an obligation
Largest contractor: DCM Clean Air Products, Inc. $45.3 million, 14.5% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	DCM Clean Air Products, Inc. Top agencies DLA (Defense Logistics Agency)	$45,309,640	14.5%	Rank history: #2 in FY2022, #2 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
2	Johnson Controls Security Solutions LLC 11 awardees, including Johnson Controls Navy Systems, LLC, Johnson Controls, Inc. and Johnson Controls Building Automation Systems, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DOJ (Department of Justice)	$9,808,957	3.1%	Rank history: #7 in FY2022, #5 in FY2023, #9 in FY2024 and not on the FY2025 list; up 9 since FY2020.
3	Honeywell International Inc. 5 awardees, including Honeywell Inc. and Honeywell Building Solutions GMBH Top agencies HUD (Department of Housing and Urban Development) Army (Department of the Army) USAF (Department of the Air Force)	$9,103,534	2.9%	Rank history: #8 in FY2022, #7 in FY2023, #2 in FY2024 and #62 in FY2025; up 4 since FY2020.
4	Tyonek Native Corporatio 2 awardees, including Tfab Defense Systems LLC Top agencies Army (Department of the Army)	$8,722,725	2.8%	Rank history: #30 in FY2022, #13 in FY2023, #71 in FY2024 and not on the FY2025 list; up 55 since FY2020.
5	Hunter Defense Technolog 2 awardees, including HDT Expeditionary Systems Inc. and Berg Manufacturing, Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$8,535,680	2.7%	Rank history: #1 in FY2022, #1 in FY2023, #22 in FY2024 and not on the FY2025 list; down 4 since FY2020.
6	Virginia Energy and Lighting, LLC Top agencies DISA (Defense Information Systems Agency)	$7,621,688	2.4%	Rank history: not on the FY2022–FY2025 lists; up 116 since FY2020.
7	Leonardo S.p.A. 5 awardees, including Engineered Coil Company, DRS Naval Power Systems Inc. and Laurel Technologies Partnership Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$6,662,620	2.1%	Rank history: #10 in FY2022, #30 in FY2023, #6 in FY2024 and #6 in FY2025; down 3 since FY2020.
8	RTX Corporation 7 awardees, including Hamilton Sundstrand Corporation, Raytheon Company and Goodrich Lighting Systems Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DOS (Department of State)	$6,626,245	2.1%	Rank history: #9 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
9	Colfax Corporation Through Howden American Fan Company Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$4,991,986	1.6%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
10	Howden American Fan Company Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$4,931,207	1.6%	Rank history: #3 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
11	RSE Inc. Top agencies Army (Department of the Army)	$3,772,892	1.2%	Rank history: not on the FY2022 list, #61 in FY2023, #82 in FY2024 and #97 in FY2025; up 38 since FY2020.
12	Windward Enterprises, LLC Top agencies DLA (Defense Logistics Agency)	$3,741,877	1.2%	Rank history: #12 in FY2022, #17 in FY2023, #20 in FY2024 and #25 in FY2025; up 1 since FY2020.
13	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,954,203	0.9%	Rank history: #15 in FY2022, #26 in FY2023, #18 in FY2024 and #22 in FY2025; up 2 since FY2020.
14	Munters Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$2,913,337	0.9%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
15	Snowbird Environmental Systems Corporation Through Snowbird Technologies Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,896,986	0.9%	Rank history: #44 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 25 since FY2020.
16	O.C. Lugo Co. Inc. the Top agencies DLA (Defense Logistics Agency)	$2,848,689	0.9%	Rank history: #86 in FY2022, #10 in FY2023, #10 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
17	Pergravis Mission Critical Construction, LLC Top agencies DISA (Defense Information Systems Agency)	$2,784,247	0.9%	Rank history: not on the FY2022–FY2023 lists, #58 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
18	Argo Turboserve Corporation Top agencies DLA (Defense Logistics Agency)	$2,761,465	0.9%	Rank history: #17 in FY2022, #25 in FY2023, #25 in FY2024 and #20 in FY2025; up 18 since FY2020.
19	Design West Technologies Inc. Top agencies Navy (Department of the Navy)	$2,747,742	0.9%	Rank history: #43 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
20	TLD America Corporation Top agencies Navy (Department of the Navy)	$2,744,358	0.9%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; up 314 since FY2020.
21	Ashland Electric Products Inc. Top agencies DLA (Defense Logistics Agency)	$2,692,981	0.9%	Rank history: #23 in FY2022, #32 in FY2023, #26 in FY2024 and #37 in FY2025; down 2 since FY2020.
22	Cepeda Associates, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$2,399,496	0.8%	Rank history: #5 in FY2022, #9 in FY2023, #8 in FY2024 and #11 in FY2025; down 12 since FY2020.
23	Clayton Associates Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$2,255,868	0.7%	Rank history: #59 in FY2022, #28 in FY2023, #19 in FY2024 and #27 in FY2025; up 12 since FY2020.
24	Janels Industries Inc. Top agencies DLA (Defense Logistics Agency)	$2,238,602	0.7%	Rank history: #22 in FY2022, #19 in FY2023, #38 in FY2024 and #34 in FY2025; down 6 since FY2020.
25	Fakt-Technik GMBH Top agencies Army (Department of the Army)	$2,174,352	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	Howden North America Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) Army (Department of the Army)	$2,166,728	0.7%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
27	James A Quick Inc. Top agencies Army (Department of the Army)	$2,165,171	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	BBA Aviation PLC Through Ontic Engineering & Manufacturing, Inc. Top agencies DLA (Defense Logistics Agency)	$2,101,211	0.7%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
29	Aero Precision Industries LLC Through Allclear Aerospace & Defense, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,863,950	0.6%	Rank history: #41 in FY2022, #27 in FY2023, #23 in FY2024 and not on the FY2025 list; up 31 since FY2020.
30	Parker-Hannifin Corporation Top agencies DLA (Defense Logistics Agency)	$1,700,971	0.5%	Rank history: #20 in FY2022, #48 in FY2023 and not on the FY2024–FY2025 lists; up 61 since FY2020.
31	Thermo Electron Corporation 6 awardees, including Fisher Scientific Company L.L.C., Thermo Orion Inc. and Thermo Fisher Scientific (Asheville) LLC Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) Commerce (Department of Commerce)	$1,655,182	0.5%	Rank history: #55 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
32	Dynamic Air Engineering, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$1,610,063	0.5%	Rank history: #89 in FY2022, #58 in FY2023, #41 in FY2024 and #24 in FY2025; down 16 since FY2020.
33	Government of Canada Through Canadian Commercial Corporation Top agencies DLA (Defense Logistics Agency)	$1,579,674	0.5%	Rank history: not on the FY2022 list, #88 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
34	Hansome Energy Systems Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,552,210	0.5%	Rank history: #11 in FY2022, #4 in FY2023, #3 in FY2024 and #13 in FY2025; new, not ranked in FY2020.
35	Southern Aire Contracting, Inc. Top agencies DHS (Department of Homeland Security)	$1,525,114	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Labrepco Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture) USUHS (DOD Uniformed Services University of the Health Sciences)	$1,486,936	0.5%	Rank history: #29 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; up 62 since FY2020.
37	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$1,452,933	0.5%	Rank history: #19 in FY2022, #68 in FY2023, #63 in FY2024 and #4 in FY2025; down 32 since FY2020.
38	Fad Pennsylvania Inc. Top agencies DLA (Defense Logistics Agency)	$1,409,844	0.5%	Rank history: not on the FY2022–FY2025 lists; up 65 since FY2020.
39	Euramco Safety, Inc. Top agencies Navy (Department of the Navy)	$1,359,596	0.4%	Rank history: #54 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
40	Theodor Wille Intertrade GMBH Through Atlantic Diving Supply, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) VA (Department of Veterans Affairs)	$1,345,601	0.4%	Rank history: not on the FY2022–FY2025 lists; up 27 since FY2020.
41	Quality Refrigeration Company, Inc. 2 awardees Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Commerce (Department of Commerce)	$1,317,579	0.4%	Rank history: #56 in FY2022, #76 in FY2023, #57 in FY2024 and #39 in FY2025; up 67 since FY2020.
42	Filtration Services, Inc. Top agencies DOJ (Department of Justice)	$1,304,496	0.4%	Rank history: #13 in FY2022, #22 in FY2023, #16 in FY2024 and #16 in FY2025; up 40 since FY2020.
43	Brighton Cromwell LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,273,665	0.4%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
44	Phoenix Systems Engineering Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) DOJ (Department of Justice)	$1,231,262	0.4%	Rank history: #39 in FY2022, #46 in FY2023, #59 in FY2024 and #58 in FY2025; down 14 since FY2020.
45	Hi-Tech Air & Water Purification Systems, LLC Top agencies USAF (Department of the Air Force)	$1,185,418	0.4%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
46	Transdigm Group Incorporated 3 awardees, including Electromech Technologies LLC, Skurka Aerospace Inc. and Aerocontrolex Group, Inc. Top agencies DLA (Defense Logistics Agency)	$1,173,060	0.4%	Rank history: not on the FY2022–FY2025 lists; up 29 since FY2020.
47	Accentz, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$1,106,788	0.4%	Rank history: #21 in FY2022, #35 in FY2023, #62 in FY2024 and #28 in FY2025; down 3 since FY2020.
48	Logis-Tech, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,083,265	0.3%	Rank history: not on the FY2022 list, #31 in FY2023, not on the FY2024 list and #65 in FY2025; down 6 since FY2020.
49	Xenex Disinfection Services Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DHA (Defense Health Agency)	$1,052,103	0.3%	Rank history: #37 in FY2022, #51 in FY2023, #32 in FY2024 and #67 in FY2025; down 35 since FY2020.
50	Berkeley Building Company Top agencies Army (Department of the Army)	$1,041,180	0.3%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
51	Percival Scientific Incorporated Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$1,036,841	0.3%	Rank history: #38 in FY2022, #44 in FY2023, #42 in FY2024 and not on the FY2025 list; down 8 since FY2020.
52	Megabite Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$1,030,629	0.3%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
53	Government of the United States 2 awardees, including Federal Prison Industries, Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) JFK (John F. Kennedy Center for the Performing Arts)	$1,021,676	0.3%	Rank history: #95 in FY2022, #49 in FY2023, #29 in FY2024 and #41 in FY2025; up 19 since FY2020.
54	Binder Inc. Top agencies Navy (Department of the Navy)	$1,018,518	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$1,017,705	0.3%	Rank history: #69 in FY2022, #54 in FY2023, #50 in FY2024 and #35 in FY2025; up 21 since FY2020.
56	Super Vacuum Manufacturing Co., Inc. Top agencies Navy (Department of the Navy)	$1,004,329	0.3%	Rank history: not on the FY2022–FY2025 lists; up 69 since FY2020.
57	Howell Laboratories Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$999,918	0.3%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 24 since FY2020.
58	HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army)	$998,569	0.3%	Rank history: not on the FY2022–FY2023 lists, #7 in FY2024 and #3 in FY2025; down 3 since FY2020.
59	Select Gases, LLC Top agencies HHS (Department of Health and Human Services)	$993,758	0.3%	Rank history: #45 in FY2022 and not on the FY2023–FY2025 lists; up 92 since FY2020.
60	S I T Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$990,493	0.3%	Rank history: #82 in FY2022, #95 in FY2023, #47 in FY2024 and #33 in FY2025; down 12 since FY2020.
61	NGH Retail LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$958,709	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Noble Sales Co. Inc. 2 awardees, including Tactical & Survival Specialties, LLC and Noble Supply & Logistics, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$956,660	0.3%	Rank history: not on the FY2022–FY2025 lists; up 400 since FY2020.
63	Unimex Corporation Through Paragon Defense Solutions Inc. Top agencies DLA (Defense Logistics Agency)	$946,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Imeco Inc. 2 awardees Top agencies Navy (Department of the Navy)	$940,404	0.3%	Rank history: #61 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; down 35 since FY2020.
65	The RAE Corporation Top agencies DOT (Department of Transportation)	$871,241	0.3%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; down 19 since FY2020.
66	Venergy Group LLC Top agencies VA (Department of Veterans Affairs)	$863,852	0.3%	Rank history: #97 in FY2022, #62 in FY2023, #85 in FY2024 and not on the FY2025 list; down 33 since FY2020.
67	New Future Contracting Top agencies USAF (Department of the Air Force)	$852,883	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Aktio Corporation Top agencies Navy (Department of the Navy)	$851,040	0.3%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
69	Sky Creative for Trading and Contracting Company Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$850,844	0.3%	Rank history: not on the FY2022–FY2023 lists, #48 in FY2024 and #69 in FY2025; new, not ranked in FY2020.
70	The L.c.doane Company Top agencies DLA (Defense Logistics Agency)	$832,648	0.3%	Rank history: #71 in FY2022, #52 in FY2023, #65 in FY2024 and #74 in FY2025; down 33 since FY2020.
71	Cummins Inc. Top agencies DLA (Defense Logistics Agency)	$826,079	0.3%	Rank history: not on the FY2022–FY2025 lists; down 68 since FY2020.
72	Saudi Naval Support Co. Top agencies USAF (Department of the Air Force)	$825,240	0.3%	Rank history: #18 in FY2022, #43 in FY2023, #43 in FY2024 and not on the FY2025 list; down 19 since FY2020.
73	Foxtrot Construction Inc. Top agencies VA (Department of Veterans Affairs)	$824,439	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Aero Specialties Inc. Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$762,030	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Rev-Cap Company, Inc. Top agencies DLA (Defense Logistics Agency)	$761,432	0.2%	Rank history: not on the FY2022–FY2025 lists; up 99 since FY2020.
76	Gardner Co Inc. Top agencies DMA (Defense Media Activity)	$755,686	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Multistack LLC Top agencies DOS (Department of State) NASA (National Aeronautics and Space Administration)	$709,971	0.2%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 33 since FY2020.
78	Lektron Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$699,308	0.2%	Rank history: #28 in FY2022, #94 in FY2023, #56 in FY2024 and #48 in FY2025; down 21 since FY2020.
79	Adrick Marine Group, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$696,071	0.2%	Rank history: #88 in FY2022, not on the FY2023 list, #86 in FY2024 and not on the FY2025 list; up 4 since FY2020.
80	Aqua-Chem, Inc. Top agencies DLA (Defense Logistics Agency)	$694,857	0.2%	Rank history: not on the FY2022 list, #79 in FY2023 and not on the FY2024–FY2025 lists; down 48 since FY2020.
81	Portable Air Group LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$694,031	0.2%	Rank history: #68 in FY2022, #39 in FY2023, #33 in FY2024 and #90 in FY2025; up 48 since FY2020.
82	Russells Technical Products Inc. Top agencies Army (Department of the Army) Commerce (Department of Commerce)	$693,621	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	General Dynamics Corporation 4 awardees, including Electric Boat Corporation, General Dynamics Land Systems - Canada Corporation and General Dynamics Mission Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$684,347	0.2%	Rank history: #6 in FY2022, #3 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
84	3ON Systems Inc. Top agencies DLA (Defense Logistics Agency)	$677,916	0.2%	Rank history: #35 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; down 23 since FY2020.
85	Par Defense Industries, LLC Top agencies DLA (Defense Logistics Agency)	$668,317	0.2%	Rank history: not on the FY2022–FY2025 lists; up 327 since FY2020.
86	Chesapeake Marine Refrigeration Corp Top agencies Navy (Department of the Navy)	$653,739	0.2%	Rank history: not on the FY2022–FY2023 lists, #36 in FY2024 and #51 in FY2025; up 26 since FY2020.
87	So-Low Environmental Equipment, Co Top agencies VA (Department of Veterans Affairs) DOS (Department of State) USDA (Department of Agriculture)	$648,310	0.2%	Rank history: not on the FY2022–FY2025 lists; down 48 since FY2020.
88	J.t. Systems, Inc. Top agencies Navy (Department of the Navy)	$642,440	0.2%	Rank history: not on the FY2022–FY2023 lists, #67 in FY2024 and #89 in FY2025; down 18 since FY2020.
89	SAFRAN 2 awardees, including Avox Systems Inc. Top agencies DLA (Defense Logistics Agency)	$640,174	0.2%	Rank history: not on the FY2022–FY2025 lists; down 80 since FY2020.
90	Export 220Volt Inc. Top agencies DOS (Department of State) Army (Department of the Army)	$640,146	0.2%	Rank history: #32 in FY2022, #84 in FY2023, #55 in FY2024 and #91 in FY2025; down 70 since FY2020.
91	Johnson Controls Inc. Through Johnson Controls Building Automation Systems, LLC Top agencies Navy (Department of the Navy)	$621,146	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Wesco International, Inc. Through Wesco Distribution Inc. Top agencies USAF (Department of the Air Force)	$617,320	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Protec Facility Solutions GMBH Top agencies DECA (Defense Commissary Agency)	$602,439	0.2%	Rank history: #65 in FY2022, #11 in FY2023, #15 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
94	Empire Trading, LLC Top agencies USAF (Department of the Air Force)	$597,128	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	American Engineering Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$587,067	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	P.a.r. Products Co Top agencies DLA (Defense Logistics Agency)	$577,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
97	Aantilia LLC Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) HHS (Department of Health and Human Services)	$554,995	0.2%	Rank history: #34 in FY2022, #57 in FY2023, #76 in FY2024 and #30 in FY2025; up 7 since FY2020.
98	Nilofer Battiwala Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$541,650	0.2%	Rank history: not on the FY2022–FY2025 lists; up 116 since FY2020.
99	Electric Heater Company the Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$514,021	0.2%	Rank history: not on the FY2022 list, #42 in FY2023 and not on the FY2024–FY2025 lists; up 83 since FY2020.
100	Meggitt PLC 3 awardees, including Meggitt Defense Systems, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$503,191	0.2%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; down 79 since FY2020.

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100 of 1,210 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 3334

Code	Net obligations	Largest contractor
33341 Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing	$303,331,790	DCM Clean Air Products, Inc.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $313 million obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 3334 contractors in FY2021?

1. DCM Clean Air Products, Inc. ($45.3M), 2. Johnson Controls Security Solutions LLC ($9.81M), 3. Honeywell International Inc. ($9.1M), 4. Tyonek Native Corporatio ($8.72M), 5. Hunter Defense Technolog ($8.54M), 6. Virginia Energy and Lighting, LLC ($7.62M), 7. Leonardo S.p.A. ($6.66M), 8. RTX Corporation ($6.63M), 9. Colfax Corporation ($4.99M), 10. Howden American Fan Company ($4.93M).

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