Goodman furnace serial number age

How to Read York Serial Numbers. How to Read York Serial Numbers – Full Explanation. Style #1: 10 Characters – Letters and Numbers – October 2004 to Present. Serial Number Example: N0D6653823. Style #2: 10 Characters – 4 Letters + 6 Numbers – 1971 to 2001. Serial Number Example: YHFM321456.

Goodman furnace serial number age. rslocum (Richard Slocum) January 13, 2007, 11:05pm 1. I could use a little assistence determining the age for this Janitrol Forced Air furnace. I don't have any info on Janitrol in my cheat sheets…Thanks in advance ! Model# GMT070-3. Serial# 0111609792. jwilliams4 (Jae Williams) January 13, 2007, 11:50pm 2. Janitrol is now a Goodman product ...

Decoding Lennox Model Numbers could not be easier than with the HVAC Decoder App installed on your smartphone. This app will also handle the modern style Lennox model numbers for Furnaces, Evaporator Coils, Heat Pumps, Package units, and more. Take this old model number HS18-311-4P for example. Nothing in it gives you a hint about the cooling ...

This "How to Locate Your Furnace Model and Serial Number" video guides the viewer through how to find, identify and use the information on the manufacturer d...Whether you need a York furnace model number or a Goodman furnace model number, it’s a good idea to know where to find furnace model numbers and how to decode them. These numbers a...Ameristar is an HVAC brand manufactured by Ingersoll Rand, and the first two numbers of the serial number are the year of manufacture. So the heat pump condenser data plate shown below indicates the unit is from 2018. ... Field Guide for Home Inspectors, a quick reference for finding the age of 154 brands of HVAC systems, water heaters, and ...How to find or figure out the age of your HVAC furnace. On most furnaces it is impossible to find a date stamp anywhere that shows how old the furnace is. To...Jan 11, 2020 · How To Look At A House. How can I determine the age of an Amana furnace from the serial number? The first two numbers in the serial number of an Amana furnace are the year of manufacture. So the serial number below indicates the unit is from 2010. Also see Who makes Amana air conditioners, heat pump, and furnaces? A Goodman furnace includes highly dependable units, which ensure optimal heat for your property year-round. Whether you are looking for a new or a replacement furnace, we have you covered. From homes to businesses, Goodman is a seasoned and reputable brand that continues to receive stellar industry ratings and reviews.

The model and serial number can be found on the rating plate of your air conditioner or heat pump. This is generally found slightly above the refrigerant valves on the back side of the unit. Additionally, many local Goodman brand dealers will affix the “traveler label” from the shipping box to the paperwork provided to a homeowner post ...Description: Twelve (12) character serial number. Begins with a single letter, followed by a single number, then another single letter and ends with four numerical digits, followed by a dash (-) and five numerical digits. Year of manufacture is 4th & 5th digits of the serial number combined.If you are looking for the model number of your Goodman thermostat or control, you can find it in a few different places. 1. Check the front panel of the thermostat or control. The model number is usually printed on the …How to Determine the Age of a Goodman Furnace? You can determine the age of a Goodman furnace by simply looking at its serial number. The first four digits of the serial number represent the year and month of its manufacturing. The first two digits denote the year, while the third and fourth numerals are the month of production.The first two numbers of the serial number, after a single letter, are the year of manufacture of a Tempstar furnace. So the data plate for the Tempstar furnace shown below indicates it was manufactured in 2015. Sometimes the date is also listed nearby. To determine other key specs of your HVAC system, see one of these other blog posts:The first two numbers in the serial number of an Amana furnace are the year of manufacture. So the serial number below indicates the unit is from 2010. Also see Who makes Amana air conditioners, heat pump, and furnaces? To determine other key specs of your HVAC system, go to one of these other blog posts:Tuesday, July 10, 2018. Xenon heating and air conditioning systems are manufactured by the Goodman Company and use the same serial number system as other Goodman products: the first two numbers of the serial number are the year of manufacture. So the serial number 08 10023290 shown below was manufactured in 2008.

Let's say that the serial number is #1E-123456 (it was used in the 1970s), where one is 1971, and E is May. Serial Number #P16-12ABCD (Trane used it in 1983)- P is the year (1999), whereas 16 is the week. Serial Number #03161-ABCDE (Trane used the system between 2002 and 2009). 03 represents the year (2003), 16 represents the week, and 1 is ...The date of production/manufacture or age of ARCIAURE® HVAC equipment can be determined from the serial number located on the data plate. ... Ten (10) character Serial number begins with four (4) numerical digits followed by one (1) letter and ends with five (5) numerical digits. Week of manufacture is 1st – 2nd numerical digits. Year of ...Nov 26, 2023 · For instance, if the serial number is 1004541123, it indicates that the unit was produced in April of 2010 (04 2010). By decoding the serial number, you can easily determine how old your Goodman air conditioner is. How to tell goodman age by serial number? To determine the age of a Goodman unit by its serial number, simply examine the first 4 ... A goodman furnace serial number is unique in its way. Knowing the serial number will help you find out more about the product, its specifications, its. Financing Available | 12 Months & No Interest (604) 704-0300. Your Trusted HVAC Experts Since 1999. Schedule a Service. Request a Quote.The date of production/manufacture or age of Inter-City® HVAC equipment can be determined from the serial number located on the data plate. Parent Company: International Comfort Products, LLC, a division of UTC. Example serial number styles/formats found: Style 1: L920671787. Style 2: 9414B39332. Back to Brand Listing.

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Maytag® Water Heaters. How to determine the date of production/manufacture or age of Maytag® HVAC Systems. The date of production/manufacture or age of Maytag® HVAC equipment can be determined from the serial number located on the data plate. Parent Company: Nortek (formerly Nordyne …Apr 16, 2022 · Goodman marketed the Janitrol® brand as "budget friendly" residential and commercial air conditioners, heat pumps, and furnaces. Goodman® discontinued use of the Janitrol® brand name in 1992. Pre-1982 history: In 1927, Surface Combustion Co. Inc. (based in Toledo, OH) introduced the Janitrol brand of home heating and cooling appliances. Decoding the Manufacturing Date. Here are some examples of Bosch serial numbers, with the three-digit date code shown underlined: 399A- 760 -000031-8733942691 (Manufacture Date: 720) 35201730001497738007220 (Manufacture Date: 173) 35201800000027738007319 (Manufacture Date: 180) 3520- 175 -0000289-7738007421 …Old Goodman furnace model numbers. Finding information about old Goodman furnace model numbers can often be a challenge. If you’re looking for older Goodman furnace model numbers, you’ll need to research the company’s records or website. Knowing the make and type of your Goodman furnace can help you in finding an approximate age …Tuesday, July 10, 2018. Xenon heating and air conditioning systems are manufactured by the Goodman Company and use the same serial number system as other Goodman products: the first two numbers of the serial number are the year of manufacture. So the serial number 08 10023290 shown below was manufactured in 2008.How to determine the date of production/manufacture or age of Williams® HVAC Systems. The date of production/manufacture or age of Williams® HVAC equipment can be determined from the serial number located on the data plate. Parent Company: Williams Furnace Company.

Let's say that the serial number is #1E-123456 (it was used in the 1970s), where one is 1971, and E is May. Serial Number #P16-12ABCD (Trane used it in 1983)- P is the year (1999), whereas 16 is the week. Serial Number #03161-ABCDE (Trane used the system between 2002 and 2009). 03 represents the year (2003), 16 represents the week, and 1 is ...Tuesday, July 10, 2018. Xenon heating and air conditioning systems are manufactured by the Goodman Company and use the same serial number system as other Goodman products: the first two numbers of the serial number are the year of manufacture. So the serial number 08 10023290 shown below was manufactured in 2008.Welcome to your ultimate guide for determining the age of your Goodman air conditioner. As a homeowner, it’s essential to know the age of your HVAC system to anticipate possible repairs and replacements. Luckily, you can easily discover your Goodman air conditioner’s age by decoding the serial number.How to determine the date of production/manufacture or age of A.O. Smith ® brand Water Heater Systems. Water heaters in general have an average estimated useful service life of 10-12 years, though water quality, routine upkeep/maintenance, and location of the water heater will all play critical roles in the longevity of these systems.Cool technology to make finding and buying parts a breeze, including Serial Number Lookup, PartSPIN® and Smart Manuals, found on partstown.com and our industry-leading mobile app ... When you want OEM Goodman furnace parts to fit your heating unit, rely on Parts Town. Or check out our other Goodman parts for your HVAC systems. We have ...How to determine the date of production/manufacture or age of ICP® HVAC Systems. ... Example serial number styles/formats found: Style 1: G051650885; Back to Brand Listing. Style 1: G 0516 50885. Description: Ten (10) character Serial number begins with one (1) letter digit followed by nine (9) numerical digits.The age of your HVAC unit plays an essential role in how efficient and well a unit operates.Three ways to discover the age of your HVAC unit. Servicing Orange County & the Surrounding Areas. Call Us Today. Toll-Free: (800) 994-2577 ... you can always locate the brand, model and serial number on the plate, which will help to determine the age of ...Decoding the Manufacturing Date. Here are some examples of Bosch serial numbers, with the three-digit date code shown underlined: 399A- 760 -000031-8733942691 (Manufacture Date: 720) 35201730001497738007220 (Manufacture Date: 173) 35201800000027738007319 (Manufacture Date: 180) 3520- 175 -0000289-7738007421 …Some serial killers have murdered more than 100 people. Who are the worst serial killers, and why did they do it? Advertisement In movies such as "Watcher" and "Mindcage," and TV s...How old is a Goodman furnace model number CAPF3636BBA serial number 0 8 0 3 1 9 1 0 6 0 8 6 - Answered by a verified HVAC Technician. ... I am trying to find the age of a Goodman HVAC 60 Hz unit with model number GSH130181AC, serial number ***** since it is the unit associated with a house I am trying to purchase. ...1995 Goodman Furnace Serial Number Location; ... R = 1964 S = 1965 T = 1966 U = 1967 How to Determine Furnace Age Serial numbers prior to April 1992=1st two numbers. Goodman Manufacturing has expanded its furnace offering by adding a D-width (24-1/2") to the popular GMVC96 and AMVC96 furnaces in the 100MBH, 5 ton size. ...Modern Carrier equipment (that would be all gas furnaces, air conditioners, and heat pumps) use a four-digit number as the first four places of the serial number for the age of the equipment. In the example below, this unit is a 2017 model. It's also important to note that modern Carrier equipment will also have a box printed on the data ...

Find an Goodman dealer in your local area. Find a Dealer Customer Reviews. Check out which Goodman products earned the most praise* from owners like you. Customer Reviews COVID-19 Resources. We're proud to be part of an HVAC industry so essential to our nation's infrastructure, and we are working hard to provide support during this ...

Although the Magic Chef nameplate was only in production during the 1980s and 90s, many furnaces were installed around the Gainesville area, especially in apartment/condos and mobile homes. The 8th digit of the serial number, which will be a letter (and typically the next to last digit) denotes the year of manufacture:Concord®. How to determine the date of production/manufacture or age of Concord® HVAC Systems. The date of production/manufacture or age of Concord® HVAC equipment can be determined from the serial number located on the data plate.How can I determine the age of an American Standard furnace from the serial number? There are two serial number formats: 1) 2002 to present - If the serial number is a 9-digit combination of letters and numbers that starts with a number, then the first number is the year. Beginning in 2010, the first two digits are the year.Fortunately, with the HVAC Decoder App you can find out the age of a wide assortment of brands and product categories with just the click of a button or touchscreen. To demonstrate the action of the built-in Nordyne Serial Number Decoder, take a look at the following results for a Manmouth serial number. In this example, the 4th and 5th digits ...For instance, the serial number "W1D5xxxxxx" shows the manufacturing date of the unit as April 2015. This guide will walk you through decoding your unit's serial number and clarifying the age of your York HVAC for effective maintenance scheduling and upgrade considerations. Why the Age of Your HVAC System MattersAt Goodman, we believe in American dependability. Units are designed, engineered and assembled in the U.S.A. Find a Dealer. Product Reviews. Technical Specifications. Share. Learn more about the refreshingly affordable Goodman GSZ14 Heat Pump with up to 15 SEER / 9.0 HSPF efficiency.The characters are all numbers. The first two digits indicate the year the furnace was made. For instance, if the first 2 numbers are 02, the year is 2002, 05 is 2005, 10 is 2010, 18 is 2018, etc. The 3 rd and 4 th numbers represent the month. For instance, 01 is January, 02 is February through 12, which is December. Sample Serial #: 0408 52398.How can I tell the age of a Goodman air conditioner from the serial number? The first two digits of the serial number are the year of manufacture for a Goodman heat pump or air conditioner. This unit was manufactured in 2013. However, if you have an older furnace, you may need to use your detective skills.How to determine the date of production/manufacture or age of Enertech Global® HVAC Brand Systems. The date of production/manufacture or age of Enertech Global® brand HVAC equipment can be determined from the serial number located on the data plate. Parent Company: Enertech Global, LLC. Example serial number styles/formats found: Style 1 ...

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For example, a Goodman brand gas furnace with an AFUE rating of 98% indicates that for every $1.00 of energy used to operate the furnace only two cents is not fully utilized. Seasonal Energy Efficiency Rating is the term used to identify the air-cooling efficiency rating of a heat pump. The higher the rating number the more efficient it is ...Receive a $250 incentive when you replace your furnace with a new high-efficiency model. This reduces home heating costs by 25% per year. Furnace incentives will run until December 31, 2017; Take advantage of these rebates today!How to determine the date of production/manufacture or age of A.O. Smith ® brand Water Heater Systems. Water heaters in general have an average estimated useful service life of 10-12 years, though water quality, routine upkeep/maintenance, and location of the water heater will all play critical roles in the longevity of these systems.The date of production/manufacture or age of Daikin brand HVAC equipment can be determined from the serial number located on the rating data plate. Example serial number styles/formats found: ... Daikin completes 4.2 million square foot, state-of-the-art facility and consolidates Goodman's HVAC manufacturing, logistics, and customer support ...In the winter time, a good heating furnace can make all the difference in keeping you and your family warm. Goodman furnaces are one reputable line of furnaces for the cold months....Apr 19, 2016 · Description: Twelve (12) character serial number. Begins with a single letter, followed by a single number, then another single letter and ends with four numerical digits, followed by a dash (-) and five numerical digits. Year of manufacture is 4th & 5th digits of the serial number combined. The date of production/manufacture or age of Goodman brand HVAC equipment can be determined from the ten character serial number located on the rating data plate. Example serial number styles/formats found: Style 1: 97 04 011000; Style 2: 5 F U 5472618P;Discover Goodmant registration FAQs of newly purchased and installed air conditioner, gas furnace, heat pump, packaged unit or other Goodman HVAC products. ….

Appliance Age Finder. Use the form below to find the age of your appliance. Ensure the data entered is accurate as a single mistaken digit can produce different results. Entering the full model number can provide increased accuracy when decoding the serial number. Be aware this tool is not meant for extremely dated appliances and is generally ...{{ngMeta.description}}Year of manufacture can be determined by using the 1 st & 2 nd digits of the serial number. Month of manufacture can be determined by using the 3 rd & 4 th digits of the serial number . NOTE: This style was used with HF, G-O, & PG series models and system types from 1984 thru present. It is always an 8-digit serial number.Brand 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.Monday, April 22, 2019. Tempstar is manufactured by International Comfort Products, LLC, and the first two numbers in the serial number (after a single letter) are the year of manufacture. So the serial number on the data plate below indicates the unit was manufactured in 2013. To determine the sixe in tons of an Tempstar system, see our blog ...Here is a breakdown of the year codes for Goodman air conditioners: Examples: Serial number starting with “01” indicates a manufacturing year of 2001. Serial number starting with “12” indicates a manufacturing year of 2012. Serial number starting with “19” indicates a manufacturing year of 2019. Serial number starting with “20 ...The serial number should be on a data tag, typically on the side or near the electrical connections. It’s usually a metal plate or a sticker that’s playing it cool in the shade of the unit’s housing. For Furnace: Look for the service tag on the furnace’s exterior casing. It’s usually around the burner compartment or near the ...Use The Chart Below to Determine the Age of Your Furnace: Amana: For tonnage refer to FLA & RLA. For age use the serial number and the “B-L-A-C-K-H-O-R-S-E” code wherein S=1969, E=70, B=71, L=72. (Of course, now that they’ve been bought by Goodman, who knows what’ll happen.) Goodman furnace serial number age, A serial number that starts with a letter is a clear sign that your unit is at least nineteen years old. Models that range from the year 1983 to 2001 are coded with a letter. Each letter corresponds to a different year, so you must be familiar with how to interpret the Trane furnace date code. It begins with the letter W, which stands for 1983 ..., Here is a breakdown of the year codes for Goodman air conditioners: Examples: Serial number starting with “01” indicates a manufacturing year of 2001. Serial number starting with “12” indicates a manufacturing year of 2012. Serial number starting with “19” indicates a manufacturing year of 2019. Serial number starting with “20 ..., V = 1988. W = 1989. X = 1990. So the serial number below indicates that it was manufactured in 1996, based on condition of the unit. From 2004 to the present, the first two numbers in the serial number, located at the second and fourth characters, are the year of manufacture. So this serial number shows that it was manufactured in 2009., HVAC BRAND MODEL NUMBER NOMENCLATURE. Select one of the drop-down lists below. that corresponds to the FIRST letter. of your HVAC brand name. Then make your selection from the list. HVAC - A. HVAC - B. HVAC - C. HVAC - D., Style # 3 Amana serial numbers are eight characters - all numbers - with a "-" after the first and second numbers. Example: 98- 90558. Year: In style # 3, the first and second digits together indicate the year the unit was made, so 98 means it was made in 1998. Month: N/A This style of serial number does not give you the month it was ..., Goodman will also assist consumers in gathering information on their units, including the drain pan serial number, the furnace model number and brand name, and the model number for the outdoor system., You can find the Trane tonnage and SEER in the 5 th, 7 th and 8 th characters of the Trane model number. The 5 th character represents SEER in a single number; the 7 th and 8 th characters, also numbers, show the tonnage code. The Trane model number nomenclature for central air conditioners and heat pumps is explained below in this Trane model ..., Gas Furnace. Up to 96% AFUE. Product Overview. GM9S92. ★★★★★ ★★★★★. 4.6. Up to 92% AFUE Upflow Multi-Position Installation. Product Overview. Find the best selection of Up to 98% AFUE Gas Furnaces at Goodman - HVAC products designed, engineered and assembled in the USA!, SS-GSZ13 goodmanmfg.com 27 AHRI Ratings Product Specifications. 2006 Nomenclature GOODMAN FURNACES Airflow Direction Digits 6-8 045 = 45,000 070 = 70.000 090 = 90,000 115 = 115,000 140 = 140,000 Product Description GOODMAN 80% FURNACES Model Number 80% AFUE Single-Stage Multi-Speed., How to Read York Serial Numbers. How to Read York Serial Numbers – Full Explanation. Style #1: 10 Characters – Letters and Numbers – October 2004 to Present. Serial Number Example: N0D6653823. Style #2: 10 Characters – 4 Letters + 6 Numbers – 1971 to 2001. Serial Number Example: YHFM321456., The Amana Serial Number is located on the exterios AC data plate. As I state above, Amana data plates is identical to a Goodman data plate. It's located on the top rear area of the unit. You can find the data plate by removing the top-front service panel and looking to the left side of the exterior AC/Furnace unit., The date of production/manufacture or age of Williamson Thermoflo® HVAC equipment can be determined from the serial number located on the data plate. Parent Company: Weil-McLain a division of Marley-Wylain Company. Example serial number styles/formats found: Style 1: CP 5160092. Style 2: 7302764. Style 3: A8602779., Several numbers appear on the tag, including the model number, serial number, ... Amana is manufactured by Goodman and the newer Amana model number format follows the Goodman model number style. The 6th or 7th and 8th digits are usualy indicates the tonnage system. ... (High-Efficiency, Single-Stage, Multi-Speed Amana …, A serial number starting with 0193, for example, may have been made the first week of 1993. Look for a sticker or tag that gives a date when the furnace was last serviced. This is usually common on gas furnaces and may list the date that the furnace was installed. This can often give a close approximation of the unit's age., Locate the data plate go the lower slot and find your consecutive number. The age of the unit is coded in the first quad digits. Finder yours Goodman SINGLE age is slim. Locate the data plate go the lower divisions and find your serial number. The age of the unit is coded in the first four digits. Skip to content 242-500-3460. Main; Ben's ..., The duration of warranty coverage in Texas and Florida differs in some cases. At Goodman, we believe in American dependability. Units are designed, engineered and assembled in the U.S.A. The CHPF Series, Helium Pressure-Tested Evaporator Coil by Goodman. HVAC products designed, engineered and assembled in the USA!, Description: This five (5) character serial number was transcribed from a Hallmark® brand boiler manufactured by Boyertown Furnace Co. Boyertown assigns consecutive numbers to their brands. To determine the date of manufacture it is necessary to call Boyertown at (610) 369-1450 for assistance., 1st Classification: Goodman Single Stage Furnaces: These furnaces operate at a single heating output level, typically full blast.They are cost-effective but may be less energy-efficient compared to other types. Goodman Two Stage Furnaces: These furnaces have two heating stages, allowing them to adjust heat output based on the demand.This results in improved energy efficiency and better comfort ..., How to Read York Serial Numbers. How to Read York Serial Numbers – Full Explanation. Style #1: 10 Characters – Letters and Numbers – October 2004 to Present. Serial Number Example: N0D6653823. Style #2: 10 Characters – 4 Letters + 6 Numbers – 1971 to 2001. Serial Number Example: YHFM321456., Goodman Furnace Serial Number Location On Box >>> http://shorl.com/hylykabrujyme Goodman…Furnace…Parts:…Fast…Shipping…RepairClinic.com. https://www ..., How do I determine the age of an Intertek ETL heat pump or air conditioner from the serial number? Saturday, March 5, 2022 Although the Intertek logo appears prominently on the data sticker of many Japanese, Korean, and Chinese HVAC units, it is not a manufacturer., If your Goodman furnace won't turn off, the first thing to check is your thermostat. Ensure it's set to "heat" and "auto" (not "on"). The temperature should be set around 72℉. If the temperature is set too high, it could cause this problem. Your home may be allowing hot air from the furnace to escape., The model and serial number can be found on the rating plate of your air conditioner or heat pump. This is generally found slightly above the refrigerant valves on the back side of the unit. Additionally, many local Goodman brand dealers will affix the “traveler label” from the shipping box to the paperwork provided to a homeowner post ..., HVAC AGE CODES IN SERIAL # INFO Amana: BLACKHORSE. B=1971 or 1981. (Of course, now that they've been bought by Goodman, who knows what'll happen.) **BARD **1962 to March 1980 Sample Number 123456 A D 1st six digits are the Unit Identity Number. ... Goodman: First two digits of the serial number are the year. Second two are the month. Btu ..., How to determine the date of production/manufacture or age of Comfort-Aire® 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 …, HVAC BRAND MODEL NUMBER NOMENCLATURE. Select one of the drop-down lists below. that corresponds to the FIRST letter. of your HVAC brand name. Then make your selection from the list. HVAC - A. HVAC - B. HVAC - C. HVAC - D., To age your Daikin equipment, find the serial number that is printed just below the model number on the data plate. The first two digits are the year the equipment was made, and the second two digits are the month. This is the same as aging Goodman HVAC equipment. In the example below the serial number is 1705282056., How to determine the date of production/manufacture or age of Coleman® 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 ..., The characters are all numbers. The first two digits indicate the year the furnace was made. For instance, if the first 2 numbers are 02, the year is 2002, 05 is 2005, 10 is 2010, 18 is 2018, etc. The 3 rd and 4 th numbers represent the month. For instance, 01 is January, 02 is February through 12, which is December. Sample Serial #: 0408 52398., This "How to Locate Your Furnace Model and Serial Number" video guides the viewer through how to find, identify and use the information on the manufacturer d..., Determine The Age of My Water Heater. The first two characters of the serial number represent the year and month of manufacture. Register my warranty. Production Year ... This rating plate example shows the model number in blue and the serial number in yellow. Service, Repair or Replace 3 Simple Steps. Whatever your issue, it’s easy to solve ..., In Style # 1 the 10 character serial number will consist of 4 numbers, a letter, and then 5 more numbers. Sample Serial # – 3709 E07806. Week: First 2 numbers represent the week from 01 – 52. The numbers here are 37, so the 37 th week, which is in September. Year: The 3 rd and 4 th numbers indicate the year from 85 – 99 (1985 – …, The serial number can be found on the "rating plate" sticker of your product. For outdoor units such as air conditioners and heat pumps, the rating plate can be found on back of the unit above the service valve connections. On furnaces, the rating plate sticker can be found on the inside of the front door panel.