Some units will have the “Armstrong - Columbus, Ohio” nameplate on them, but follow the same serial number pattern. 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 serial. HVAC Coverage Lookup. This tool will assist you in verifying warranty coverage on a piece of equipment. You will need a valid serial number(s) for the covered equipment.
![]() How can I find out the SEER of my air conditioner?
Saturday, July 28, 2018
There are seven different ways you can determine either the exact or approximate SEER of your heat pump or air conditioning system. Let’s start with the easy, simple ways to get an exact number, and work down to other methods that will provide an approximate rating for your system:
1) If the yellow and black rating sticker is still intact on the side of the condenser and legible, like in the photo below, it will tell you.
2) Look for a sheet taped to the front of the air handler (indoor unit), where the HVAC contractor has listed the performance data for the system.
3) Some manufacturers encode the SEER rating in the beginning of the model number on the data plate of the condenser. For example, the “XC21” at the beginning of the model number of the Lennox condenser shown below indicates it is rated at 21 SEER. Older systems do not do this.
4) If it is a replacement system and you have a copy of the building permit, it will usually also show the SEER of the system. In many areas, building permits can be looked up online at the county or city building department’s website, and it will often show the SEER of the system in the description of the work or the attached notes. The SEER of a heat pump or a/c system is the result of the combination of the performance of both the condenser and air handler, so the actual SEER listed on the contractor’s performance data sheet or the building permit may be slightly higher or lower than the SEER rating of the condenser alone.
5) If you look for the manufacturer’s logo plate on the side or top of the condenser, it will may have a model name like “Comfortmaster 1200” or “RoyalAir 10,” which indicates the approximate—but not always exact—SEER of 12 or 10 for the system.
6) If you know the year of manufacture of the system, which is usually coded in the data plate of the condenser unit as the first two or second two numbers of the serial number, you can determine an approximate SEER based on the when it was made. See our blog post “What is the SEER of my old air conditioner?” for more on this approach.
7) And last, if all else fails and you really, really want to know the exact SEER of the system, jot down the model number and serial number from the data plate and call or email the manufacturer’s customer service department with the information and a request for the SEER rating of your unit.
There is one potential flaw in several of these techniques. It has been required since 2006 that both the condenser and air handler be replaced unless it can be verified that the new half of the system that the HVAC contractor is switching out is matched by the manufacturer for performance with the remaining component. However, if part of the system was replaced by someone willing to do it without the required building permit, the SEER rating efficiency of the new part of the system may not be achieved because of the mismatch to the older part. If, for example, your outdoor unit is LENNOX and the indoor unit is GOODMAN, you definitely have a mismatched system and there is no way to determine the actual efficiency rating.
To learn more about the requirement to match condenser and air handler, click on the link below to download a pdf info sheet from the Florida Department of Community Affairs.
Also, see our blog posts How can I find out the size of my air conditioner? and How can I find out the age of my air conditioner or furnace?
• • • • • • • • • • • • • • • • • • • • • • • • • • • •
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To learn more about heating and air conditioning systems, see these other blog posts:
• How can I find out the SEER of my air conditioner?
• My air conditioner won't turn on. What's wrong?
• How can I find out the size of my air conditioner?
• How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump?
• Where is the air filter for my central air conditioner and furnace? I can’t find it?
• Does an old air conditioner use more electricity as it ages?
• How did homes stay cool in Florida before air conditioning?
• What is wrong with an air conditioner when the air flow out of the vents is low?
• Why has the thermostat screen gone blank?
• Why does it take so long to cool a house when an air conditioner has been off for a while?
• Why is my air conditioner not cooling enough?
• What are the most common problems with wall/window air conditioners?
• Will closing doors reduce my heating and cooling costs?
Visit our HEATING AND AIR CONDITIONINGpage for other related blog posts on this subject, or go to theINDEXfor a complete listing of all our articles.
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Age of heating equipment & Systems:
How to determine the age of your heating system and components. Here we provide several excellent sources for de-coding the data tag information on heating equipment.
This article provides documents that explain and translate all of the data found on information tags and stickers used on heating & heat pump equipment, including equipment age, heating capacity, electrical requirements, and operating characteristics.
We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
Heating System Equipment Age - Guides for Reading HVAC & Water Heater Equipment Data Tags & Serial Numbers
If you don't know whether your heat is provided by a furnace (hot air) or boiler (hot water), or whether your fuel is oil, gas, or electric, and whether your heat is hot water, steam, or warm air, see HEATING SYSTEM TYPES.
Then return to this page for help finding the equipment's age or date of manufacture.
Five HVAC Heating & Air Conditioning Equipment Age & Data Tag Decoders
Our photo shows data tags on a Weil McLain gas fired heating boiler that was manufactured on 10/10/1996. [Click to enlarge any image]
We found the boiler age by de-coding the boiler's CP/serial number code on the white sticker just above the data tag. Below we explain how we did that.
For help in decoding air conditioner, boiler, furnace, heat pump, water heater data tags and determining the age, model, or specifications of that equipment, we provide five different research methods listed below.
Free Online HVAC Equipment Data Tag Decoders
We provide links to individual manufacturer's data tag decoding guides (Lennox, below), and to two excellent equipment data tag decoding books, by Scott LeMarr (online at this website) and the Carson Dunlop & Associates Ltd. Technical reference - the most extensive such document we've found.
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For many heating or cooling equipment manufacturers, especially after 2000, decoding the equipment tag to obtain the age of the device is sometimes pretty easy.
But equipment age, capacity, specifications are not always so easy to recognize on the data tag. Here we explain how to dig out that information.
[Click to enlarge any image]
1. Lennox HVAC products Age: see our LENNOX Heater & Air Conditioner Model & Serial Number Decoding Guide [PDF] at this website. Also see
2.FURNACE AGE DECODING CHART [PDF] provided by home inspector Scott LeMarr has generously shared his document that decodes both furnace age for many brands of water heater, including hot water systems produced by the following manufacturers.
[PDF linked to return here. You can also use the 'BACK' button on your browser to return to this page at InspectAPedia.com.]
LeMarr's document provides decoding data for the following manufacturers:
Ambassador water heaters, American water heaters [3], ACE water heaters, A.O.Smith water heaters, Apollo, Aqua Temp, Aqua Therm, Best water heaters, Bosch water heaters, Bradford White, Cafos, Champion, Crosley, Energy Saver, Envirotemp water heaters, GE water heaters, Glascote water heaters, Golden Knight water heaters, GSW, Hotpoint water heaters, JC Penny, Jetglas, JW or John Wood, Kenmore water heaters (Sears Brand), Lochinvar, Lowes, Mainstream, Maytag water heaters, Montgomery Wards, Knight, PermGlas, Reliance water heaters, Revere, Rheem water heaters, Rheem/Rudd/Richmond water heaters, Rinnai, Security, Shamrock water heaters, Standard water heaters, State/Reliance/Sears brand water heaters, Thermo-King, Vanguard water heaters, US Craftsmaster, US Water Heaters, and Whirlpool water heaters..
Carson Dunlop Associates' Technical Reference Guide decodes equipment data tags
Carson Dunlop Associates' Technical Reference Guide (below) provides the most extensive HVAC equipment data tag decoder & other information to determine the age of boilers, furnaces, water heaters, air conditioners, and heat pumps by decoding the product serial number.
For the most complete and very detailed HVAC equipment data tag and age decoding information anywhere (about 128 manufacturers & brands)
Carson Dunlop, Associates, Toronto, have provided us with (and we recommend) Carson Dunlop Weldon & Associates'Technical Reference Guide to manufacturer's model and serial number information for heating and cooling equipment
Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on any number of copies of the Technical Reference Guide purchased as a single order. Just enter INSPECTATRG in the order payment page 'Promo/Redemption' space.
The Carson Dunlop Technical Reference Guide provides both equipment data tag decoding data and also manufacturer contact information as well as historical dates for many brands of heating and cooling equipment. Included in the manufacturers listed are also makers of ancillary equipment such as controls, circulator pumps, etc., not just boilers, furnaces, and heat pumps themselves.
The age of a heating boiler, furnace, or heat pump can be determined by identifying its year of manufacture that is encoded in the unit's serial number (not the model number). The guides above give heater serial number decoding for each manufacturer and type of heating appliance.
For example, when decoding the age of an H.B. Smith heating boiler one of our readers provided the following from his boiler's data tag:
H.B. Smith, Westfield MA
Series G200 Boiler Model # G200-W-5CON Serial # J80-2747
For an HB Smith boiler the age is typically the two digits following the letter at the beginning of the serial number. In this case the '80' following the 'J' tells us that the boiler was manufactured in 1980.
Later H.B. Smith boiler serial numbers use the format XXyyyy-nnnn where yyyy will be the four-digit year of manufacture.
Manufacturers & brands of HVAC Equipment and Parts identified and decoded in the CDA Technical Reference Guide include about 128 different brands of equipment sold in North America
Aaon, Inc., Ack-O-Matic ,Aero Burners, Aero Environmental, Airco, Airtemp and Tempmatic, Aitons' Equipment - APCO, Allanson Transformers, Amalgamated Electric, Amana, American Standard, American Standard Water Heater Group, Amtrol, Anthes, APCO, ARCO Air, Arkla Industries, Armstrong Air Conditioning Co., S.A. Armstrong,
Baltimore Aircoil of Canada, Bard, Bell & Gossett, Borg-Warner, Bradford White, Bristol Compressors, Bryant manufacturing Co. of Indianapolis, Buffalo Package Equipment, Bulloch, Burke Water System Industries, Burnham Corporation,
Canadian Tire Corporation, Carlyle Compressor Company, Carrier, Chromalox Canada, Chrysler, Clare Brothers, Clare Mega Save, Clare HECLA, Clawsey-Sohrt Manufacturing Co., Climate Control Products, Climate Master, Climatrol, Coleman, Comfort Aire, Copeland, Copelaweld Compressors, Crane, Davie Environmental Equipment, Day-Nite, DMO Industries, Ducane Heating Division, Dunham Bush, Duomatic, Economite, Elect-Aire, Electric Apparatus COmpany, Elliot, Emerson Electric Company, Enmar Enmar Systems, Envirotron, Esso, Evcon Industries,
F.P. Industries, Fairbanks Morse, Fedders, Fess, Findlays Limited, Flamemaster, Fleetline, Florida Heat Pump Manufacturing, FMC Corporation, FP Industries, Franklin Electric Company, Frick, Friedrich, Frigidaire, Frigiking, Fuel Master Burners, G.M.L. Manufacturing, GSW Inc., Galais Manufacturer, Galaxy Boilers, General Controls (ITT), General Electric, Gilbarco, Gilbert and Barker, Goettl, Good Cheer, Goodman, Grimsby Stove and Furnace Ltd.,
Heat Controller Inc., Heil, Hill York, Hitachi, Homart, Honeywell, Howard Furnace and Boilers, Howell Electric Motors Company, Hydrotherm Inc., I.C. Burners, ITT, Inglis, Inter City Gas (I.C.G.), International, International Comfort Products, Intertherm, Iron Fireman, Janitrol Heating and Air Cooling Conditioning, John Wood Co., Johnson Air Ease, Keeprite, kenmore, Koldwave, Kool-Fire, LG,
The Arthur S. Leitch Co., Lennox Industries, Lincoln, Louis Allis Company, Luxaire, Magic Chef Air Conditioning Co., Mgnatec, Marathon Electric, Marcus Transformer, Marley Cooling Tower, Marvair, McLary, McQuay International, Mestek, Metzger, Metropolitan Oil and Gas Industries, Mid Continent Metal Products Co., Miller, Mitsubishi, Modine, Mueller, N'Furno, Nordyne, Norseman Boilers, Oakwood Iron Works (OIW), Olsen,
Payne, Pendell Boiler Ltd., Philco, Powermatic, Precision Boilers, Preston, Pyreco, Raypak or Raypak, RBI Water Heaters, Refcan, Reznor ITT, Rheem, Roberts Gordon, RUUD, Sanyo, SJC Corporation, Scarboro Pump Manufacturing Co., Sears, Sears Roebuck, Severn Boiler, Simpsons-Sears, Shell, Singer, Slant Fin Ltd., A.O. Smith, H.B. Smith Co., Smith Boilers, Snyder General Corp., Spacepak, Spencer Boilers, State Industries, Sterling HVAC Products, Sun Dial Manufacturing Inc., Sunscan Compressors,
TACO (Canada), TACO, Tappan, TECO, Techumseh Compressors, Teledyne Laars, Tempmatic, Temprite, Tempstar, Thermo Pride, Trane, Typhoon, Unitary Products, viessman, Viking, Warden King, Water Furnace, Watts Regulator Co., Weben jarco, Weil-McLain, Westinghouse, Whirlpool, White-Rodgers, Wood, Worthington Air Coils Ltd., York - Borg Warner.
How to Use Heating Equipment as Indicators of Building Age or Building Age as to Figure Equipment Age
Indoor heating methods by historic periods or years: (adding date ranges is continuing for the list below - Contact Us to contribute).
Illustration of a Warn Air Heating System Using a Gravity Furnace
Our photo (left) shows a gravity warm-air 'octopus' furnace; in its earliest version these furnaces, installed in the late 1800's in the U.S. were coal fired; many were later converted to oil.
Gravity furnaces rely on natural convection (warm air rises) to deliver heat to the occupied space.
There is no blower fan in the system. In their simplest design, the gravity furnace system included no ductwork whatsoever. Rather a large grate was provided in the building floor just above the furnace itself. In a multi-story house, heat rose to upper floors by passing up the stairwell or through open registers in first floor ceilings.
The gravity furnace we show at left was a more advanced design in which an 'octopus' of duct work 'arms' delivered heat directly to individual areas of the building.
The furnace in our photo is taking much of its 'return air' from the basement - a very expensive way to heat a home. Earlier models eschewed ductwork and instead fed heat into the first floor of the building through a large central grate in the floor immediately above the furnace.
If you don't know what kind of heat your building uses, we explain how to figure out the answer
at HEATING SYSTEM TYPES.
If your heating system is not working properly,
see NO HEAT - BOILER or NO HEAT - FURNACE.
Beginning at HEATING SYSTEMS - home we discuss different types of heating systems such as
We also discuss various heating appliance fuel types (coal, oil, gas) as an aid in determining the age of a home or other building.
Antique Gas-Fired Floor & Wall HeaterReader Question: Royal Heater in-floor gas fired heater history
I just bought a home in California. It has a dual sided, vent less, gas floor heater.
[Click to enlarge any image]
The only name I see is ' Royal Heater'. there are 2 valves; one for burner, one for pilot.
You need a key to turn them. On top of the unit is a view finder cap. Inside it looks like a 3 burner pilot
. I have attached photos of it. I'm trying to find any information on it. thank you.
[This particular heater] works beautifully and has been inspected. I want to find a operator's manual so I can maintain it.
- G.L., 16 Jan 2015 Reply: history of Royal Metal Works gas fired floor heaters in California
G.L.
The Royal brand in-floor gas heaters were originally designed in California in the late 1920's - we have a patent (Publication No. US1666367 A) by Louis Clausing (Burlingame CA) assigned to the Royal Metal Works (his own company held in partnership with Max Schwartz describing an earlier version of the product dated 1928: 'Heating device.' U.S. Patent 1,666,367, issued April 17, 1928.
Your photos below illustrate the interals of this floor-wall gas heater.
That that company was Royal Metal Works, 238 Van Ness Ave, in San Francisco, CA. That patent was cited by other product patents between 1943 and 1982.
Below at left your photo shows the gas controls including main valve (left) and pilot valvce (right-hand stem). At below right you've shown the pilot flame (I think).
The company filed just three patents, two for heaters and one for metal bending:
and
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There is presently a [different] California Royal Metal Company (in fact several of them)
who might be able to give you more historical data, is a sheet metal fabricator whose business was established in 1981 but who may have known of the older Royal Metal Works who made your heater:
Royal Metal, Ted Rieck Enterprises Inc, 1228 South Wright St., Santa Ana, CA 92705 USA Phone: (714) 542-4763 Web: Royalmetal.com
Unless you object, I'll add your photos to data we have at InspectApedia and will leave you anonymous (our default) unless you let me know that you want to be identified. That may attract comment from other readers who have similar products.
I'll attach the documents of interest to this article.
Watch out: I would not assume that the heater you have is safe to use without both a thorough visual inspection and testing for gas leaks as burning LP or natural gas in a defective appliance can produce fatal carbon monoxide gas.
I would suspect that your device may also lack safety features of modern gas heaters. If you are going to ignore my timid warnings then at least be sure you have working CO and smoke detectors properly located and installed.
Other antique wall heating convectors are shown at WALL CONVECTORS HVAC
Heating Equipment Data Tag Location & Identification
This discussion explains where to find the data tag on air heating equipment.
To see specific details for your heater (boiler, furnace, heat pump, etc) you will need to know the brand and hopefully the model, then see
AIR CONDITIONER BOILER FURNACE AGE, MANUALS & PARTS GUIDES - HVAC
Heating equipment data tags are usually found on the exterior of the heater, usually on its top, front, or sides.
On occasion you may find the data tag information inside of the heating device, accessed by opening a removable front cover.
Often by removing the front cover of a forced warm air furnace, the equipment data tag is found inside the furnace jacket on the left, right, or directly on the exposed face of the furnace itself.
In our first photo shows gas fired heating boiler located in a garage.
The yellow arrow points to the common location of the equipment data tag on the upper left side of a Weil McLain heating boiler. [Click to enlarge any image]
Our second photo above shows the common location for the equipment data tag (circled in yellow) on a Peerless cast iron boiler.
On this page we illustrate typical equipment data tags on heating boilers and furances.
Our first photo below shows the data tag for a Smith Cast Iron Boiler.
You will find the model number identified on this heater as SERIES 19A SERIES-S/W-5, and SERIAL NUMBER FA2002-533.
Our second photo below shows the data tag on the exterior of an HB Smith heating boiler, Model BB14-*-4, (the * indicates that this is a steam boiler), though in my over-shot photo the serial number is not quite visible.
Furnace Data Tags Often Are Behind An Access Cover
Some gas furnaces sport a data information tag on the furnace interior left or right side, visible only after removing the front cover.
Below is the data tag for a rusty old Holland gas furnace, visible on the front of the furnace above the gas burner tubes, accessible only when the furnace front cover door has been removed.
Other Information Tags Are Not Equipment Data Tags
Watch out: not all of the information labels, tags, stickers seen on and in heating appliances are data tags. Don't get confused and don't think that because you cannot find the model and serial number on a label that the equipment has no data tag.
Look further on the outside and inside of the device. A true 'data tag' includes brand, model name, and serial number, often along with other information.
Other labels on heating equipment may give warnings or usage instructions, like the label I show below. This sticker gives model and oil burner nozzle guide information for System 2000 boilers by Energy Kinetcs - a boiler I installed in a New York home nearly 20 years ago) but this is not the unit's data tag.
Taking a further look around this same System 2000 Energy Kinetics boiler we spot the actual boiler 'data tag' giving its model and serial number on a smaller sticker that I show below.
Also see DATA TAGS on AIR CONDITIONERS
Age of the Boiler or Furnace as an Indicator of Building AgeExample of How to sort out shared names such as Flamemaster & Climate Master
If the heating equipment in your building is original - which may be determined by visual inspection, by knowing the building age, or knowing the heating system age, then each of these can inform us about the probable age of the other.
For example, an original Flamemaster (or Climatemaster) gas fired heating furnace is probably 40 or more years old even if you cannot find the date code in the furnace serial number.
Watch out: Names and who is using them can change over time: for example the name 'Flamemaster' appears on other products such as sealants, coatings and packaging produced by Flamemaster in Pacoima California, US - not a heting equipment manufacturer.
The product line Flamemaster gas furnaces shared product designs with ClimateMater. ClimateMaster continues in business (in 2015) as a manufactuer of geothermal heat pump systems.
...
Continue reading at MANUALS & PARTS GUIDES - HVAC - sources of more information including heating & air conditioning equipment age, history, manuals & manufacturer contact information, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.
Or see AGE of HEATER BOILER FURNACE FAQs - questions and answers posted origionally on this page.
HOME CONSTRUCTION CATALOGS 1950 - catalogs including heating equipment from the 1950s
Or see these
Articles on Building Component Age
Suggested citation for this web page
AGE of HEATERS, BOILERS, FURNACES at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
INDEX to RELATED ARTICLES: ARTICLE INDEX to HEATING SYSTEMS
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