#
3M
A
Aaon
ABB
Access Burner
Actaris/Itron
ADP
Aegis Bearing Protection Ring
Aerco Boiler
Air Ease
Air Pro
Airco
Aire-Flo
Airquest
Airtemp
Airxchange
Alco
Alcoswitch
Allanson
Allied Air
Amana/Goodman
American Air
American Standard
Antunes Controls
AO Smith Water Heaters
Apollo Valves
Apollo Water Heater
Aprilaire
Asco
Automation Components Inc (ACI)
B
Baldor Motors
Barber Colman
Baso
Beckett Bell & Gossett
Bradford White
Broan Furnaces
Broan-NuTone
Browning
Bryant
Burnham Boiler
C
Carlyle
Carnes
Carrier
Central
Central Environmental Furnace
Central Furnace
Centurion
Century Motors (A.O. Smith)
Champion Spark Plugs
Chevron Tubing
Cla Val
Cleveland Controls
Climate Master
Coleman
Comfort Aire
Comfort Maker
Comfort Range
Command Air
Concord
Conquest
Consolidated Industries
Cooper Atkins
Copeland Compressors
Corsair
Crane-Weinman Pump
Criterion Furnace
Cutler-Hammer
Cyclone Commercial Water Heaters
D
Daikin/McQuay
Danfoss
Day & Night
Delta Valves and Actuators
Detroit Radiant
Domestic ITT
Drainview Products
DriSteem
Ducane
Dunham-Bush
Dunkirk
Duomatic Olsen
Dwyer (Mercoid Controls)
E
Ecobee
Elsie (Fusible Links)
Emerson Flow Controls
EMI
Enviro-Tec
Equimeter (Rockwell)
Erie
Evcon
EWC
F
Fasco
Fenwal
Field Controls
Fireye
Flowserve-Worcester Valve
France
Fraser-Johnston
Friedrich Air Conditioning
Frigidaire
Fulton Boilers
Functional Devices (RIB)
Furnas 
Future Design Controls
G
G-C Valves
G.E. Furnace
G.E. Water Heater
Gamma
Gibson
GMC
GN Electronics
Goodman
Goulds Pumps
Grand Aire
Greenheck
Grundfos
Guardian

H
Hankison
Hartland Controls
Heat Controller
Heil Quaker
Hoffman Electronics
Hoffman Specialty
Honeywell
Honeywell Analytics (Vulcain)
Honeywell Eclipse
Honeywell E-MON Meters
Honeywell Elster AMCO Water Meters
Honeywell Genesis Cable
Honeywell Industrial
Honeywell Kromschroder
Honeywell Maxon
Honeywell Microswitch
Hubbell Pressure Switch
Hydrolevel (Safeguard)
Hydrotherm
I
ICM Controls
ICP
IDEC
Illinois Products
Indeeco
Intermatic/Grasslin
International Environmental
Intertherm
Invensys (Robertshaw)
iO HVAC Controls
J
Jackes Evans
Jandy
Janitrol
Johnson Controls
K
Keeprite
KMC Controls
Kunkle
L
Laars
Lau
Leeson
Lennox
Liebert
Lincoln
Littelfuse
Little Giant
Lochinvar
Lovejoy Couplers
Lux
Luxaire
M
Macon Radiator Valves
Magic Chef
Magnatrol
MAMAC Systems
Mammoth
Marathon Motors
Marley
Mars
Marvair
Maxitrol
Maytag
McDonnell & Miller
Mepco
Mercury Displacement Inc (MDI)
Metraflex
Metrex Valve
Midco International
Miller
Mitsubishi
Mitsubishi Electric
Modine
Moore Industries
Mueller Industries
Multi Products
N
National Comfort. Products
Nicholson Traps
Nordyne
Nor’East Controls
Norgas Controls and Metering
Nortec Humidity
Nortek Global HVAC
Nu-Calgon
NuTone
O
Olsen
Omron
Oneida Royal
P
Packard Motors
Paco
Panasonic
Paragon
Parker
Patterson Kelley Boilers
Payne
Peco
PennBarry
Pennco
Pepperl & Fuchs
Perc
Philco
Pietro Fiorentini
Potter Brumfield
Powers Industrial
PRO 1 IAQ
PSG Controls (Accustat)
Q
Q Mark
Quattro
Quincy Compressor

R
Ranco
Raypak
RBI Boilers
Re-Verber-Ray
Redington
Reliance Hot Water Heater
Resideo
RetroAire
Revcor Inc
Reznor
Rheem
Richmond
Robertshaw
Romet
Ruskin
Ruud
S
Sanhua
Sanyo
Sarco
Schneider Electric
Sears
Sensus
Sensit
Setra
Shipco
Siemens
Siemens Combustion
Singer
SKF Bearings
Skinner
Slant Fin Boiler
Snyder General
Solair
Solitaire
Spartan Valves
Spartan Peripheral Devices
Spence
Spiralink
Sporlan
Square D
Sta Rite Pumps
State Industries
Sterling
Supco
Superior Radiant Products
Sure Comfort
System Sensor
T
Taco
Takagi
Tankless Water Heater
Tappan
TB Wood’s
TE Connectivity
Teco – Westinghouse
Tecumseh
Tekmar
Teledyne Laars
Temp-Stat
Tempstar
Term-lok
Texas Furance
Thermal Zone
Titus
Tjernlund
Tork
Trane
Trerice
Tunstall
U
Unitary Products
United Electric Products
US Motors
Utica
V
Valley Tool
Velocity Boiler Works (Crown Boiler)
Venstar
Veris
Viconics
Viessmann
W
Warren Valves
Warrick
Watsco (Cam-Stat)
Watts
Watts Pneumatic
Wayne Combustion
Weather King WEG
Weil Pump
Weil-McLain
Weinman
Welker
Westinghouse
Whirlpool
White Rodgers
Wilkerson Air Preparation
Williams
Winchester
Worcester Controls
X
Xenon
Xylem-Goulds Pumps
Y
York
Z
Zephyr
Zonefirst