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Industrial Equipment, MRO

HVAC

HVAC Article

HVAC (pronounced either "H-V-A-C" or, occasionally, "aitch-vak") is an initialism/acronym that stands for "heating, ventilation, and air conditioning". HVAC is sometimes referred to as "climate control" and is particularly important in the design of medium to large industrial and office buildings such as sky scrapers and in marine environments such as aquariums, where humidity and temperature must all be closely regulated whilst maintaining safe and healthy conditions within. In certain regions (e.g., UK) the term "Building Services" is also used, but may also include plumbing and electrical systems. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilation is dropped as HACR (such as the designation of HACR-rated circuit breakers).

Heating, ventilation, and air conditioning is based on the basic principles of thermodynamics, fluid mechanics, and heat transfer, and to inventions and discoveries made by Michael Faraday, Willis Carrier, Reuben Trane, James Joule, William Rankine, Sadi Carnot, and many others. The invention of the components of HVAC systems goes hand-in-hand with the industrial revolution, and new methods of modernization, higher efficiency, and system control are constantly introduced by companies and inventors all over the world.

The three functions of heating, ventilation, and air-conditioning are closely interrelated. All seek to provide thermal comfort, acceptable indoor air quality, and reasonable installation, operation, and maintenance costs. HVAC systems can provide ventilation, reduce air infiltration, and maintain pressure relationships between spaces. How air is delivered to, and removed from spaces is known as room air distribution.

HVAC Items

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Search:  
Honeywell PV125S 1-1/4 Swt Air Eliminator NIB!!!!

$63.50
A-1 MAGNETIC HEX WRENCH 6 SET 9" long TL-17 HVAC TOOLS

$2.26
HVAC Ridgid Tin Snip Sheet Metal Cutters Aviation Snips

$30.00
BLUE BLOWER 3 speed LN CONDITION

$32.00
GE MOTOR-1/2 HP-1685 RPM-SINGLE PHASE 208-230 VOLTS-NEW

$20.00
York 5 ton heating & air conditioning unit

$400.00
New USA 30lb Refrigerant R134a R-134a R134-FREE FREIGHT

$125.00
4-Inch Inline Duct Fan Centrifugal Hydroponic Exhaust

$99.99
AO Smith Master Fit Hot Water Heater

$600.00
Danfoss Solenoid EVR10 Valve 5/8 R22 HFC HCFC CFC Coil

$24.99
JB J/B Tube Bender Spring Set Copper Aluminum Brass

$6.99
Thermostat guard

$8.99
AC&R Refrigeration Muffles Cat. No. S6311

$29.95
YELLOW JACKET TEST AND CHARGING MANIFOLD JZ

$29.95
Little Giant Condensate Removal Pump VCMA-15ULS Series

$32.00
Bryant Commercial Spilt System A/C Unit 10 Ton NEW

$2200.00
WHOLE HOUSE FAN - ATTIC FAN - 30" - Direct Drive

$421.00
FlowPro Direct Drive Drum Fan 42" 10,100 CFM 3/4 HP NEW

$60.00
DIGITAL SENSOR Antunes Adjustable Inputs PN 8563120030

$69.99
Danfoss 3 way 1 1/2 mixing valve

$100.00
19 Book CD * HVAC Air Conditioning | HEATING Manuals CD

$0.99
18/8 THERMOSTAT WIRE 4 ROLLS1000 FEET BRAND NEW LOOK!!!

$100.00
Fieldpiece ACH4 AC Current Clamp Accesory Head **New**

$2.99
DELAVAN 2 in 1 Nozzle Changer

$10.45
Boiler Tube Parallel Gear Train Drive TUBE EXPANDER

$19.99
Dwyer 475 Mark III Digital Manometer 475-7-FM

$49.99
Fieldpiece EHDL1 Electronic Handle for Accessory Head

$11.50
4" INLINE EXHAUST GALV BOX FAN DUCT

$25.55
Halogen Refrigerant Freon Leak Detector AC/HVAC/R Tool

$69.95
RANCO ADAPTABLE TEMP CONTROL

$15.00
Digital multimeter plus other tools

$21.01
Air Brush/Flush Hose Gun Assembly Tool Kit 5 ft AC/HVAC

$37.77
8 MSA CHEMICAL CARTRIDGES FOR RESPIRATORY MASKS - GMC

$5.99
NEW COPELAND refrigeration compressor unit 21,000 btu

$295.00
1 Water Cooled Compressor 12x25' Walk in Cooler 3 phase

$350.00
air conditioning refrigerator compressor heat pump ac

$4.00
Honywell HAVC

$5.00
Recovery Cylinder

$132.50
IS LKD100 Combustible Gas Methane Leak Detector

$12.99
A/C MANIFOLD GAUGE SET A C R134a W/ CARRYING CASE

$18.36
Honeywell TP970B2002 Pneumatic Thermostat

$17.99
ASCO 3-Way Valve P/N 8320G182, 120 vac, 1/4 NPT, NC, 0-

$24.99
Boiler Tube Right Angle Bevel Gear Drive 1"

$49.99
Yellow Jacket Pressure Test Kit

$18.06
Bryan Boiler YB 2000 8-1377 D-955

$295.00
Digital multimeter plus other tools

$10.50
A/C MANIFOLD GAUGE SET A C R134a W/ CARRYING CASE

$15.50
Assorted - New - HVAC - Contractor Tools Lot

$39.00
New sealed DuPont R-22 R22 freon 30 lb. can for HVAC

$156.50
Robinair Refridgerant Manifold Gauges

$27.00
NIB Robertshaw 700-406 24 Volt Standing Pilot Gas Valve

$64.99
Honeywell SmartValve System Control SV9501M2528

$30.95
Air Brush/Flush Tool Kit Canister Hose Gun Assembly AC

$49.95
NEW YELLOW JACKET HEAVY-DUTY SWAGE/FLARE KIT 60440

$80.99
Boiler Tube Right Angle Gear Drive TUBE EXPANDER TOOL

$24.99
Alerton Building Automation Controls

$350.02
Emerson TXV Expansion Valve 5/8*1-1/8 10 Ton R22 HVACR

$29.99
NOS 12 Volt Heater Blower Motor - Look !!!

$6.99
ASPEN 3-Ton R22 R410 Evaporative Air Conditioner A-Coil

$125.00
Thermo Anemometer Vane Wind Speed Air Flow Meter NEW !!

$109.95
2-SIEMENS PNEUMATIC ROOM THERMOSTATS & WALLPLATE TH192S

$9.99
FLUKE 16 MULTIMETER & 322 CLAMP METER HVAC COMBO KIT

$139.00
Fieldpiece ACH4 AC Current Clamp Accesory Head **New**

$2.99
programmable charging meter tif 9050 for charging freon

$51.00
Weil McLain Steam Boiler for multi-family or Commercial

$1500.00
Little Giant Condensate Removal Pump VCMA-15ULS Series

$34.00
EXHAUST FAN Industrial - Belt Driven - 42" - 115V

$629.00
Beckett Electronic Igniter - Part # 51771U

$5.56
York Millenium Centrifugal Chiller Control Panel HVAC

$149.99
Ritchie Yellow Jacket charging hose 1/4"Plus II 50 ft

$70.00
Supco SmarTester Interface Kit ST100 SI50K HVAC Voltage

$39.99
Fujitsu Halcyon AOU24RLQ Split AC Outdoor Condenser

$299.00
2-Stage Rotary Deep Vacuum Pump 29.92"Hg 1/4HP AC/HVAC

$119.95
Danfoss TXV Expansion Valve TDEBX-8 R22 5/8x7/8 ODF

$39.99
LANDIS&STAEFA 3/4" FLOWRITE VALVE & ACTUATOR POWERS NEW

$24.99
R410A Manifold Gauge Set 5ft High Pressure Hoses HVAC/R

$77.77
5-Inch Inline Duct Fan Centrifugal Hydroponic Exhaust

$109.99
BACHARACH SLING PSYCHROMETER MODEL SAC

$25.00
Halogen Gas Refrigerant CFC HFC Leak Detector V2T

$24.99
IS LKD100 Combustible Gas Methane Leak Detector

$15.99
8-Inch Inline Duct Fan Centrifugal Hydroponic Exhaust

$149.99
PINNACLE MDI REFRIGERATION AC RECOVERY HVAC R-12 R134A

$250.00
Emerson TXV Expansion Valve 3/8*1/2 5-1/2 Ton R22 HVACR

$19.99
2 Ton Carrier-Mfrd A/C & Heat-Pump Package Unit

$699.00
Kent-Moore J 42220 Leak Detector Lamp

$5.51
Cleveland AFS-405 Air Pressure Sensing Switch HVAC DDC

$9.99
Supco SmarTester Interface Kit ST100 SISVK HVAC Voltage

$34.99
Asco Solenoid Valve #8215A51VM 120 Volt 1" New

$13.02
TIF 9050A Programmable Charging Meter

$89.00
Heat Timer Automatic Heating Control

$400.00
JOHNSON CONTROLS M150XGA-1 MOTOR ACTUATOR 150 LBS-IN

$99.00
Honeywell TP970A2145 Pneumatic Thermostat

$17.99
R 22 Air Conditioning Refrigerant 30 # Unused Virgin

$202.50
R410A Manifold Gauge Set w/5ft High Pressure Hoses HVAC

$79.95
Watts Regulator 0881378 1-1/2"- 3" 909AGF Air Gap

$9.99
Tecumseh Refrigeration Compressor AC Air Conditioning

$43.00
SIEMENS APOGEE LOCAL USER INTERFACE

$15.50
NEW DAYTON 48" COMMERCIAL CEILING FAN

$59.99
WHITE-RODGERS MECHANICAL HEAT / COOL THERMOSTAT

$0.99
RANCO ADAPTABLE TEMP CONTROL

$10.00