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Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. "Refrigeration" is sometimes added to the field's abbreviation as HVAC&R or HVACR, or "ventilation" is dropped, as in HACR (as in the designation of HACR-rated circuit breakers). HVAC is an important part of residential structures such as single family homes, apartment buildings, hotels, and senior living facilities; medium to large industrial and office buildings such as skyscrapers and hospitals; vehicles such as cars, trains, airplanes, ships and submarines; and in marine environments, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors. Ventilating or ventilation (the "V" in HVAC) is the process of exchanging or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air.
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Vornado VH200 1500W Whole Room Space Heater with 3 Heat Settings
Vornado VH200 1500W Whole Room Space Heater with 3 Heat Settings
Price:
69.99 USD
Ends:
Feb 16, 05:32 pm
Mid Century Modern Style Vornado Whole Room Pivot Heater with 2 Heat Settings
Mid Century Modern Style Vornado Whole Room Pivot Heater with 2 Heat Settings
Price:
50.00 USD
Ends:
Feb 25, 03:50 am
1500 WATT PORTABLE ELECTRIC CERAMIC SPACE HEATER GARAGE UTILITY ROOM HEATING FAN
1500 WATT PORTABLE ELECTRIC CERAMIC SPACE HEATER GARAGE UTILITY ROOM HEATING FAN
Price:
68.42 USD
Ends:
Jan 30, 04:34 pm
500W Portable Plug In Heater Fast Heated Room Wall Outlet Indoor Timer + Remote
500W Portable Plug In Heater Fast Heated Room Wall Outlet Indoor Timer + Remote
Price:
22.99 USD
Ends:
Feb 18, 09:28 am
Vornado VH2 Whole Room Vortex Heater w/ Adjustable Thermostat WHITESTONE
Vornado VH2 Whole Room Vortex Heater w/ Adjustable Thermostat WHITESTONE
Price:
55.00 USD
Ends:
Jan 31, 06:08 pm
Vornado VH2 Whole Room Vortex Heater - BRAND NEW in BOX!
Vornado VH2 Whole Room Vortex Heater - BRAND NEW in BOX!
Price:
40.00 USD
Ends:
Jan 31, 10:03 pm
Large Room Electric Infrared Fireplace Heater Wood Mantel Insert Heat w/ Casters
Large Room Electric Infrared Fireplace Heater Wood Mantel Insert Heat w/ Casters
Price:
249.99 USD
Ends:
Feb 04, 07:01 pm
Vornado SRTH Small Room Tower Heater Personal Black Efficient/Effective Heating
Vornado SRTH Small Room Tower Heater Personal Black Efficient/Effective Heating
Price:
24.88 USD
Ends:
Feb 25, 02:23 am
VH200 1500W Whole Room Space Heater with 3 Heat Settings
VH200 1500W Whole Room Space Heater with 3 Heat Settings
Price:
30.00 USD
Ends:
Jan 26, 01:02 am
Vornado VH2 Whole Room Vortex Heater w/ Adjustable Thermostat & Safety Shut-Off
Vornado VH2 Whole Room Vortex Heater w/ Adjustable Thermostat & Safety Shut-Off
Price:
79.99 USD
Ends:
Feb 09, 09:37 pm
De'Longhi Mica Thermic Panel Heater,Full Room Quiet 1500W w/2 Heat Settings
De'Longhi Mica Thermic Panel Heater,Full Room Quiet 1500W w/2 Heat Settings
Price:
111.99 USD
Ends:
Feb 13, 06:16 am
1500 WATT PORTABLE ELECTRIC CERAMIC SPACE HEATER GARAGE UTILITY ROOM HEATING FAN
1500 WATT PORTABLE ELECTRIC CERAMIC SPACE HEATER GARAGE UTILITY ROOM HEATING FAN
Price:
68.10 USD
Ends:
Feb 25, 07:17 am
1500 WATT PORTABLE ELECTRIC CERAMIC SPACE HEATER GARAGE UTILITY ROOM HEATING FAN
1500 WATT PORTABLE ELECTRIC CERAMIC SPACE HEATER GARAGE UTILITY ROOM HEATING FAN
Price:
250.00 USD
Ends:
Feb 18, 04:57 pm
Turbro Arcade Hr1500 Electric Mica Space Heater 1500W, Room And Office Heating W
Turbro Arcade Hr1500 Electric Mica Space Heater 1500W, Room And Office Heating W
Price:
103.49 USD
Ends:
Feb 02, 11:56 pm
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Vornado EH1-0020-25 Vortex VH2 Whole Room Heater with 2-Heat Settings, 750 /
Vornado EH1-0020-25 Vortex VH2 Whole Room Heater with 2-Heat Settings, 750 /
Price:
5.00 USD
Ends:
Jan 29, 03:45 am
1500 Watt Portable Electric Ceramic Space Heater Garage Utility Room Heating Fan
1500 Watt Portable Electric Ceramic Space Heater Garage Utility Room Heating Fan
Price:
57.38 USD
Ends:
Feb 02, 05:32 am
Vornado Whole Room Pivot Heater with 2 Heat Settings
Vornado Whole Room Pivot Heater with 2 Heat Settings
Price:
45.99 USD
Ends:
Feb 24, 09:44 pm
TURBRO Arcade HR1500 Electric Mica Space Heater 1500W, Room and Office Heating
TURBRO Arcade HR1500 Electric Mica Space Heater 1500W, Room and Office Heating
Price:
69.99 USD
Ends:
Feb 22, 05:04 pm
Full Room Radiant Thermostat, 3 Heat Settings, Energy Saving, Safety Features
Full Room Radiant Thermostat, 3 Heat Settings, Energy Saving, Safety Features
Price:
91.70 USD
Ends:
Feb 05, 10:26 am
VINTAGE Edison Deluxe Comfort Heater II Whole Room Heating
VINTAGE Edison Deluxe Comfort Heater II Whole Room Heating
Price:
35.00 USD
Ends:
Feb 24, 12:58 am
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