Lennox furnace nomenclature. 10 years on compressor. 20 years or Limited Lifetime on heat exchanger (depending upon model) Lennox Merit ® Series products. 5 years on covered components. 5 years on compressor. 20 years on heat exchanger. Healthy Climate ® Indoor Air Quality Systems. 2 or 5 years on covered components (depending upon model)

When it comes to purchasing a new furnace, one of the most important factors to consider is the cost. However, it’s essential to look beyond the price tag and understand the true c...

Lennox furnace nomenclature. Mar 6, 2021 · The document discusses Lennox product model number nomenclature. Model numbers contain codes that provide specific information about the unit such as the series, capacity in Btuh or tons, and power characteristics. Serial numbers are also systematically coded for identification. The document provides examples of typical model numbers and ...

Integrated furnace control has one red LED to indicate status and indicate diagnostic codes. Push button recall of the last 5 diagnostic codes aids in troubleshooting. Integrated furnace control has built-in twinning capability (“TWIN” terminal on control) to operate two furnaces simultaneously without any additional controls. A field

MULTI-POSITION GAS FURNACES *80.0% to 80.5% A.F.U.E. 45,000 to 140,000 Btuh (13.2 to 41.0 kW) Input 1-1/2 thru 6 Tons (3.5 thru 21.1 kW) Nominal Add-on Cooling *Isolated Combustion System Rating For Non-Weatherized Furnaces ENGINEERING DATA GAS FURNACES Down-Flow Closet Installation With Cooling Coil Up-Flow Utility Room Installation With ...product line. This high-efficiency. furnace allows more applications with. its reliable 4-way multipoise design. The model 58MXA is available in 10. heat/airflow combinations and with the. 4-way multipoise design can be. installed in upflow, downflow, or. horizontal positions covering up to 40.

You can identify the Lennox furnace age by serial number. But first, you must find the location and be able to read and decode the Lennox nomenclature. When deciding whether to repair or replace your HVAC unit, it’s a good idea to check out the age of the unit first. Lennox HVAC units have a beneficial life up-to 20 years in general.The EL195NE ultra-low NOx gas furnace with our revolutionary design delivers consistent comfort, while producing 65% lower NOx emissions than standard low NOx furnaces. So, it not only meets your comfort needs, but it also meets the needs of the environment. Learn more.Award signifies that Lennox has made outstanding contributions to design energy efficient units that will lower energy bills, while meeting industry standards for comfort and indoor air quality. Lennox was the first HVAC manufacturer to win this award and has been a four−time recipient since 2003. ISO 9001 Registered Manufacturing Quality System.April 28, 2022. We had the Lennox Elite Series EL296V, 2-stage, variable speed, high efficiency gas furnace installed 3 weeks ago. This unit is much more quiet than the 20 year old Rheem 90 series that it replaced. It took approximately one week for the "new burner" smell to go away. We also replaced our old manual thermostat with an EcoBee ...− Blower data is from unit tests conducted in the Lennox Laboratory air test chamber. − Optional electric heaters are UL & ULC listed and are rated and tested according to DOE test procedures and FTC labeling regulations. − Developed in accordance with ISO 9002 quality standards.− Blower data is from unit tests conducted in the Lennox Laboratory air test chamber. − Optional electric heaters are UL & ULC listed and are rated and tested according to DOE test procedures and FTC labeling regulations. − Developed in accordance with ISO 9002 quality standards.This manual is also suitable for: View and Download Lennox ML180UHE manual online. MERIT ML180UHE SERIES Upflow / Horizontal - High Efficiency Blower Motor Gas furnace. ML180UHE furnace pdf manual download. Also for: Merit ml180uh045e36a, Merit ml180uh070e36b, Merit ml180uh090e48b, Merit ml180uh045xe36a, Merit...Lennox G24M3-75A-11 - Lennox Furnace G24M3-75A-11- Lennox Furnace G24M3-75A-11. Free shipping on orders over $99 ...Page 26 D-Late Model G24M Series With SureLight Ignition Control TYPICAL G24M DIAGRAM (-11 MODEL SHOWN) 1 - When there is a call for heat, W1 of the thermostat ener- 5 - Gas valve opens for a 4-second trial for ignition. Ignitor gizes W of the furnace control with 24VAC.

Drill a 5/16" (8 mm) test hole into the air supply duct connected to the coil. (test hole 2 in figure 15). Connect the zero end of the draft gauge scale to the furnace end of the coil. Insert the hoses so that 1/4" (6 mm) extends inside the duct or end seal. Seal around holes with Permagum. At every turn, the ML296V gas furnace is designed to be the most energy-efficient furnace in its class. A variable-speed fan keeps temperature swings to a bare minimum. Two-stage heating saves gas by adjusting the flame size based on demand. Energy-Efficient Design - With a 96% efficiency rating, the ML296V gas furnace uses 2/3 less energy than ... You can find the age of American Standard HVAC by decoding the serial number. The production date can be found in the first 4 or 5 digits of serial number. Here we have an example of serial number nomenclature and how read it. Serial Number #7236TPW3F - This style of serial number are used from 2000 - 2009.Brand® History¹. 1895 - Lennox founded in Marshalltwon, Iowa by Dave Lennox - builds and markets the industries first riveted steel furnace. 1904 - Dave Lennox sells business to D.W. Norris, who incorporated the business as Lennox Furnace Company and proceeds to sell 600 furnaces in the company's first year. 1923 - Lennox expands to Syracuse, New York

Aire-Flo ® furnaces, air conditioners, heat pumps and air handlers feature the money-saving energy efficiency and expert craftsmanship you demand. And with over 50 years' experience, Aire-Flo knows how to deliver the durability, reliability and economy you deserve. Specifications subject to change without notice.

Perhaps you'd like to know more about the products you're considering. Maybe you'd like to read up on the equipment you've just purchased. Either way, Armstrong Air has an extensive collection of literature on every piece of equipment we offer, to help you learn more. And to help you understand why Armstrong Air is The Professional's ...

With efficiencies of up to 24.5 SEER and 11.5 HSPF, Lennox mini-split systems deliver energy-efficient comfort, and may even make you eligible for money-saving rebates. Smooth inverter technology ensures quiet operation and keeps cooled or heated air flowing without the typical starts and stops of conventional systems, virtually eliminating ...When you choose Day & Night ® heating and cooling equipment, you're selecting quality-driven, sophisticated home comfort. We are proud to give you the latest in engineering and technology—smart and efficient products with quiet and smooth operations. About Us. Select a Heating and Cooling System that's Right for Your Home.This type has 2 numbers, a letter, followed by 2 numbers, two letters, and three digits. The first two digits are the day, the letter is the month, and the following two numbers are the year **in reverse**. Use the chart below to find the letter’s respective month of manufacture. For example, 12A56JK123 would be January 12, 1965.How to determine the date of production/manufacture or age of Ruud® brand HVAC Systems. The industry average service design life for most forced air furnaces is 15-20 years, and the industry average service design life for most air conditioning condensing units is 10-15 years. The average service design life of boilers can vary from as little ...

The Lennox ELITE® Series CBA27UHE family of air handlers makes it easy to save money on energy bills, year after year. That’s because it is the first family of air handlers to use the Quantum™ Coil; a proprietary, enhanced aluminum tube and fin coil engineered for long-lasting corrosion resistance. The CBA27UHE-036-230 provides reliable ...The other installer was selling a Lennox "signature" series 13 seer H/P and 92.5% furnace. However his was almost 2500 more. Lennox has a 10 year warranty and the Westinghouse a 8. My question is, I've never seen or heard of a HVAC Westinghouse. I'd like to have some professional opionions either way before I make any decisions. Thanks! DavidThe first three digits, that is G26 in the above example can tell us about the series number of the product. G here stands for Gas and 26 means 26th unit produced in the lot. Unit capacity or Size. The next three digits, that is Q3/4 can tell you about the capacity and size of your furnace unit. Q3/4 here refers to 3-ton or 4-ton unit capacity.Upgrade your heat, lower your gas bills. The Power Saver™ constant-torque motor design uses less energy in both heating and cooling modes, helping you save on utility bills. Adjusting airflow based on demand makes the ML193E gas furnace up to 46% more efficient than standard motors.You can find the age of American Standard HVAC by decoding the serial number. The production date can be found in the first 4 or 5 digits of serial number. Here we have an example of serial number nomenclature and how read it. Serial Number #7236TPW3F - This style of serial number are used from 2000 - 2009.41.5 hp motor is required with the ZA05 and ZA06 drive kits. Raider®Packaged Gas / Electric 3 to 6 Tons / Page 14. SPECIFICATIONS BELT DRIVE MODELS - 6 TON. General Data Nominal Tonnage 6 Ton 6 Ton Model No. ZGB074S4B ZGB074S4T. Efficiency TypeStandard Standard Blower TypeSingle Speed Belt Drive Two Speed Belt Drive.Service Literature. G60UH (X) series units are mid−efficiency gas furnaces. used for upflow or horizontal applications only, manufac-. tured with Lennox Duralok Plus heat exchangers formed of. aluminized steel. G60UH (X) units are available in heating. capacities of 44,000 to 132,000 Btuh and cooling applica-. tions up to 5 tons.The Trane model number nomenclature is broken down into segments. Each segment will have a number of letters and/or digits. These letters and digits are codes that refer to the assigned value given by Trane. HVAC systems that use furnaces are called split systems and also have an evaporator coil and AC condenser or Heatpump condenser.Page 1 1991 Lennox Industries Inc. Litho U.S.A. Corp. 9121-L7 CHA16 Service Literature 2 to 5 TON Revised 02/99 CHA16 SERIES UNITS 2 THROUGH 5 TON UNITS CHA16 series units in the 2-5 ton sizes were introduced in the spring of 1990. The single package cooling units may be used in both residential and commercial applications.Adjusting airflow based on demand gives the ML193E gas furnace a 93% AFUE* rating, up to 46% more eficient than standard motors. The ML193E gas furnace has earned the ENERGY STAR® certification in the U.S. South Region. The ML193E gas furnace comes with a 20-year limited warranty on the heat exchanger and a 5-year limited warranty on remaining ...Adjusting airflow based on demand gives the ML193E gas furnace a 93% AFUE* rating, up to 46% more eficient than standard motors. The ML193E gas furnace has earned the ENERGY STAR® certification in the U.S. South Region. The ML193E gas furnace comes with a 20-year limited warranty on the heat exchanger and a 5-year limited warranty on …For residential applications, Lennox gas ducted heaters also carry a 10-year parts only warranty on the heat exchanger, the heart of all ducted heaters. The use of premium components and stringent quality control procedures provide owners with unparalleled peace of mind. Lennox Comprehensive Product Warranty for Commercial ApplicationsGas Furnaces AF80 AF80 MP A 075 B 3 Series Multi-Position Air Conditioning Add-On Cooling (Tons) 3 = 3 Tons 4 = 4 Tons 5 = 5 Tons AF80 = Aire-Flo 80% AFUE Furnace MP = Multi-Position Cabinet Heat Input 050 = 50.000 Btuh 075 = 75.000 Btuh 100 = 100,000 Btuh 125 = 125,000 Btuh Specifications Model No. AF80MPA050B3 AF80MPA075B3 AF80MPA075B45th & 6th digits = Year. How to Determine Furnace Age. Maintained by send suggestions to [email protected] Page 8. 80 = 1980 81 = 1981 82 = 1982 right on thru. The year 2000 started the numerical numbering from 00. 00 = 2000 01 = 2001 02 = 2002 right on thru to current date.product line. This high-efficiency. furnace allows more applications with. its reliable 4-way multipoise design. The model 58MXA is available in 10. heat/airflow combinations and with the. 4-way multipoise design can be. installed in upflow, downflow, or. horizontal positions covering up to 40.Allied Commercial high-efficiency HVAC units deliver lasting durability & value. All units are built & tested to rigorous standards, ensuring maximum reliability. Products; Technical Documents; Resources; Why Allied; Technology; ... a Lennox International Inc. Company 1-800-448-5872How to Read a Lennox Serial Number. This Lennox serial number lookup works for the Lennox age of unit lookup on air conditioners, heat pumps, gas furnaces, …local contractor charging me 5K, seems high. Lennox SL280UH110V60C Furnace $7,986 Saint Paul, MN 3889 sq ft. 80% efficiency, this was a builder's home and is insulated extremely well. Vents straight up through the center of the house. Would have to tear open basement ceiling to vent out the side.

AMV91155DXA. models beginning with CUX or CDX. All models beginning with AUC or ADC. All models beginning with AUY or ADY. American Standard. Freedom 90 Single Stage or High Efficiency. Gas. 91 92.1. All models beginning with AUX1 or ADX1.The second two digits of the serial number are the year of manufacture for Lennox units. This unit was manufactured in 2010. To find out the age of another brand of air conditioner or heat pump, go to How do I determine the age of my air conditioner?, which has a listing of all major manufacturers and links to instructions for decoding their ...G24M series gas fired furnaces include eight models (natural gas or propane) with input capacities of 13.2, 17.6, 22.0, 29.3, 35.2 and 41.0 kW (45 000, 60 000, 75 000, 100 000, 120 000. Down-Flow Closet Installation With Cooling Coil. and 140 000 Btuh). Up-flow, down-flow or horizontal applications. Lennox add-on evaporator coils, electronic ...Product Description. Emerson Lennox/Armstrong/Ducane 5-Speed Furnace BLOWER MOTOR. The part # is 60L22 (also 60L2201) & Emerson #K55HXHGB-8639, K55HXDUE-1249. It's 1/2 HP, 115v, 1075 RPM. The motor is 5 5/8" in diameter (Frame 48Y) and mounts with attached mounting "ears". The shaft is 1/2" in diameter and extends 3.25" out of the motor.At every turn, the Lennox ML296V090 gas furnace is designed to be the most energy-efficient furnace in its class. A variable-speed fan keeps temperature swings to a bare minimum. Two-stage heating saves gas by adjusting the flame size based on demand. With a 96% efficiency rating, the ML296V gas furnace uses 2/3 less energy than competitive ...The second two digits of the serial number are the year of manufacture for Lennox units. This unit was manufactured in 2010. To find out the age of another brand of air conditioner or heat pump, go to How do I determine the age of my air conditioner?, which has a listing of all major manufacturers and links to instructions for decoding their ...Lennox Model and Serial Nomenclature - Free download as PDF File (.pdf), Text File (.txt) or read online for free. How to identify Lennox HVAC equipment.Lennox XC 21 Air Conditioner $ 9,300.00 - $ 10,700.00 Furnace Family is a full service Edmonton & Calgary HVAC company specializing in residential furnace replacement and service, air conditioning, indoor air quality and water heaters.

G60UH(X) series units are mid−efficiency gas furnaces used for upflow or horizontal applications only, manufac-tured with Lennox Duralok Plus heat exchangers formed of aluminized steel. G60UH(X) units are available in heating capacities of 44,000 to 132,000 Btuh and cooling applica-Gas Furnace GMS9/GCS9 SERIES 93% AFUE www.goodmanmfg.com 6/04 PRODUCT SPECIFICATIONS The GMS9/GCS9 single-stage, multi-speed gas furnaces offer ... Nomenclature GM S A N8 070 3 Goodman® Brand Air Flow Direction M: Upflow/Horizontal D: Dedicated Downflow C: Downflow/Horizontal H: Hi Air Flow DescriptionFurnace Controls. Gas Valves. Ignitors. Heat Pump Defrost Control & SureSwitch Contactor Upgrade. Air Conditioning and Refrigeration Product Selector. Choose Thermostat Family or By Features. ... Lennox. Nordyne. Rheem. Trane. York. Matching Product(s) Clear Selections 0 resultsThese serial numbers can be found on all of Rheem HVAC equipment including furnaces, boilers, air conditioning units, and on Rheem water heaters. ... Following are 7 styles of serial numbers used by Rheem with explanations of the nomenclature and how to decode the manufacture date. Style #1: 10 Characters – A Letter and 9 Numbers ...View and Download Lennox GSR14 service information online. GSR14 furnace pdf manual download. Sign In Upload. Download Table of Contents Contents. Add to my manuals. Delete from my manuals. ... Lennox gas furnace user guide (7 pages) Furnace Lennox G61MPV Service Manual. G61mpv series units (109 pages) Furnace Lennox G61MPV Service Manual.Solar. SunSource® Commercial Energy System5. Factory. Field. Visit us at www.lennox.com For the latest technical information, www.lennoxcommercial.com Contact us at 1-800-4-LENNOX ©2019 Lennox Industries, Inc. (14G47) 2/19 PC92164. 92164_energence_RTU_qr_guide.indd 2. 3/4/19 9:30 AM.Features. Use Less Energy. Save More Money. With efficiencies of up to 81% AFUE and 14.00 SEER, equivalent to 13.40 SEER2, the LRP14GN can deliver significant energy savings. In fact, it can help cut your energy bills by several hundred dollars per year. Lennox (NYSE: LII) is a leader in energy-efficient climate-control solutions. Dedicated to sustainability and creating comfortable and healthier environments for our residential and commercial customers while reducing their carbon footprint, we lead the field in innovation with our cooling, heating, indoor air quality, and refrigeration systems. The standard 80% AFUE means the SL280NV can reduce your heating costs, compared to an older furnace. We have higher standards. Others think so, too. Year after year, leading institutions choose to award Lennox for its innovative initiatives in the heating and cooling industry which helps homeowners define what perfect air means to them.25 Feb 2024 ... When comparing HVAC brands, TMC utilizes some of the top names in heating and cooling, which include Trane, Goodman and Lennox.Lennox model numbers 14= 1 ton 21= 1-1/2 ton 26= 2 ton 31= 2-1/2 ton 41= 3 ton 46= 3-1/2 ton 51= 4 ton 65= 5 ton So, your unit is a two ton model. The HS stands for high side, HP for heat pump. The next two numbers are the series of unit, they generally work up as they introduce new models. Then a dash and the next two digits which are the ...The Lennox Elite® Series CBX32M air handler units are designed for installation with a matched remote outdoor unit that is charged with HFC−410A refrigerant and optional field−installed electric heat. The air handler units are for indoor installation only. These instructions are intended as a general guide and doClever design and durable construction make Armstrong Air package units an excellent all-in-one solution, and a marvel of technology. In warmer climates, the thoughtful and efficient design of Armstrong Air air handlers mean efficiency and reliability season after season. Armstrong Air affordable heating & cooling products keep you comfortable ...HVAC units are identified by their multiple-character model number that identifies a particular type of unit. Below you will find a partial explanation of the alphanumeric identification code (aka Model Number Nomenclature). ... CHPF, and CSCF**** Unit Nomenclature. Short Description- Indoor Coils Cased, Painted Upflow/Downflow, Uncased Upflow ...Lennox offers an extensive line of split system components that provide reliable performance to meet the demands of a variety of commercial applications. Our systems offer the highest efficiency available while reducing energy bills and maximizing comfort. From heat pumps and air conditioners to high-quality air handlers and indoor coils ...The EL195NE ultra-low NOx gas furnace with our revolutionary design delivers consistent comfort, while producing 65% lower NOx emissions than standard low NOx furnaces. So, it not only meets your comfort needs, but it also meets the needs of the environment. Learn more.Lennox (NYSE: LII) is a leader in energy-efficient climate-control solutions. Dedicated to sustainability and creating comfortable and healthier environments for our residential and commercial customers while reducing their carbon footprint, we lead the field in innovation with our cooling, heating, indoor air quality, and refrigeration systems.The Lennox CB29M and CB30M Elite® series blower coil units are designed for installation with a matched remote outdoor unit and optional field−installed electric heat. The blower coil units are for indoor installation only. The CB29M and CB30M units, designed for multi−position-al installations, are completely assembled at the factory

Just a brief Description of Lennox Model and Serial number and how to understand them. How to figure out your model and serial number on a Lennox unit. Thank...

The date of production/manufacture or age of Day & Night® HVAC equipment can be determined from the serial number located on the data plate. Parent Company: International Combort Products (ICP). part of UTC Building & Industrial Systems, a subsidiary company of United Technologies Corp.

Lennox® packaged rooftop units represent some of the most innovative technology in the market. Combining industry-leading efficiency with fast, easy installation and service, Lennox continues to offer reliable systems that deliver exceptional comfort in commercial buildings. A broad range of ENERGY STAR® qualified units help control energy ...Quality Parts & Supplies. LennoxPros has 1000s of HVAC Parts and Supplies from adapter curbs to welding equipment. Give LennoxPros.com a try or stop by a Lennox Store location near you. Shop Parts & Supplies. Find Lennox OEM repair parts fast. Our Repair Part Finder lets you search by model number, part number, serial number or catalog number.rating plate. On residential gas and oil furnaces this identification plate is located on the inside of cabinet near the vestibule panel. On other Lennox products the plate is …Your use of any such or similar incorporeal property is at your own risk. This guide is intended to assist Commercial/Residential Building Inspectors, HVAC professionals, Facilities Managers, HOA's, etc.., in determining the date of manufacture and/or age of HVAC equipment to determine the expected useful life (EUL).HS23 TXV. HS23 SERIES CONDENSING UNITS EXPANSION VALVE SYSTEMS. 10.10 to 12.05 SEER *11,100 to 65,500 Btuh (3.3 to 19.2 kW) Cooling Capacity 1 thru 5 Tons (3.5 to 17.6 kW) EXISTING NEGATIVE. *ARI and DOE Certified Ratings. Typical Application. FEATURES. Application — HS23 series condensing units feature high efficiency with minimum operating ...Features. Use Less Energy. Save More Money. With efficiencies of up to 81% AFUE and 14.00 SEER, equivalent to 13.40 SEER2, the LRP14GN can deliver significant energy savings. In fact, it can help cut your energy bills by several hundred dollars per year.Products that add to the performance of SL280V Variable-Speed Gas Furnace. * Based on sound pressure levels during steady-state, high-fire operation of Lennox SL280UHV070V36A and leading competitive units at mid-point temperature rise and minimum external static pressure when set up per Section 4.5.3 of AHRI 260-2001.509 01 3606 01SS 01−18−11 RGH150 SINGLE PACKAGE ROOFTOP GAS HEATING, ELECTRIC COOLING WITH R−410A REFRIGERANT Electrical Data Supplement NOTE: Read the entire instruction manual before starting the installation This supplement only applies to RGH150 units when there is "B" in the 9th position of the Model Number, as shown in the Model Number Nomenclature diagram below.

hershey park arena seatinggreater fort lauderdale matrixindiana taxidermists taxidermy in indianawalmart w2 online 2024 Lennox furnace nomenclature journalist martha raddatz [email protected] & Mobile Support 1-888-750-2641 Domestic Sales 1-800-221-7272 International Sales 1-800-241-3124 Packages 1-800-800-7111 Representatives 1-800-323-7078 Assistance 1-404-209-5842. Lennox Industries Inc. P.O. Box 799900 Dallas, TX 75379-9900 NOTE - This manual must be left with the equipment user. WARNING. Do not set thermostat below 60°F (16°C) in heating mode.Settingthermostat below 60°F (16°C)reduces the number of heating cycles. Damage to the unit may occur that is not covered by the warranty.. craigslist seattle free stuff for sale by owner Visit us at www.lennox.com For the latest technical information, www.lennoxcommercial.com Contact us at 1-800-4-LENNOX ©2019 Lennox Industries, Inc. ... Furnace Model # ML180UH070P24A ML180UH070P24A ML180UH070P36A ML180UH090P36B ML180UH090P48B ML180UH110P48C ML180UH135P60D EL180UH045E36A EL180UH070E36B EL180UH090E48B EL180UH090E60C ...The ML196E gas furnace comes with a 20-year limited warranty on the heat exchanger and a 5-year limited warranty on remaining covered components.**. * AFUE, or Annual Fuel Utilization Efficiency, is a measure of how much usable heat is generated when natural gas is burned in the unit. The higher the AFUE, the more heat you’ll get from your ... craigslist flagstaff arizona rvs by ownerantique cast iron pot holders Lennox G24M3-75A-11 - Lennox Furnace G24M3-75A-11- Lennox Furnace G24M3-75A-11. Free shipping on orders over $99 ... printable real 20 dollar billmuv fitness irmo New Customers Can Take an Extra 30% off. There are a wide variety of options. Lennox (NYSE: LII) is a leader in energy-efficient climate-control solutions. Dedicated to sustainability and creating comfortable and healthier environments for our residential and commercial customers while reducing their carbon footprint, we lead the field in innovation with our cooling, heating, indoor air quality, and refrigeration systems.performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier. IMPORTANT The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may beBrand info that may help determine an age or era. Select one of the drop-down lists below. that corresponds to the 1st letter. of your HVAC brand name. Then make your selection from the Brand Names list. HVAC - A. HVAC - B. HVAC - C. HVAC - D.