Select your manufacturer below to learn how to decode the serial number. No signup, no ads.
Choose from the dropdown, click a popular brand, or search by name.
Enter your model number, serial number, or both for the most accurate results.
Choose your equipment brand from the grid above. Don't know? Check the data plate on the unit — it's on the side panel or inside the access door.
Each manufacturer encodes the date differently. Our guide shows you exactly which digits or letters in your serial number represent the year and month.
Match your serial number to the pattern shown. Or use our auto-decoder below — enter the serial number and we'll calculate the age for you.
Find the serial number on the equipment data plate (usually on the side panel, behind the front cover, or near the electrical connections). Enter it above along with the manufacturer name, and our decoder will determine the manufacturing date. Most manufacturers encode the manufacture date in the first few characters of the serial number.
The serial number is typically found on a data plate or sticker on the furnace cabinet. Check inside the blower compartment door, on the side panel, or near the gas valve. It may also be visible once you remove the front access panel. The data plate usually shows both the model number and serial number together.
On central air conditioning units, the serial number plate is usually found on the outdoor condenser unit. Look on the back panel, near the refrigerant line connections, or behind a service panel. For window units, check the side or back of the unit. The data plate may be protected by a clear plastic cover.
Many HVAC brands are manufactured by the same parent company. Try entering your model number and our auto-detect feature will identify the correct manufacturer group. For example, Payne, Bryant, and Day & Night are all manufactured by Carrier. Ruud is manufactured by Rheem. Amana, Comfort™ and Daikin residential units share decoder logic.
Yes! We support commercial and industrial equipment including AAON, Reznor, Modine, Mammoth, McQuay, WaterFurnace, Bard, and more. This is in addition to all major residential brands. Commercial RTU and rooftop unit coverage is continuously expanding.
Our decoder uses the same serial number encoding systems published by each manufacturer. Results rated "High Confidence" match verified decoding patterns. "Medium" confidence results may have ambiguity (e.g., a year that could be 2003 or 2023). We recommend cross-referencing with the data plate when possible.
Knowing the age of your furnace, air conditioner, or heat pump is critical for making informed repair-vs-replace decisions. HVAC equipment typically lasts 15–20 years, and units over 20 years old often cost more to repair than replace. Our free HVAC age calculator supports 120+ brands across residential, commercial, boiler, and chiller equipment.
Quickly determine equipment age during service calls. Know immediately if a system is worth repairing or if you should recommend replacement. Identify R-22 systems and aging compressors at a glance.
Find out how old your furnace or AC is before calling for repairs. If your equipment is over 15 years old, a new high-efficiency unit could save 20–40% on energy bills — and may be cheaper than a major repair.
Track equipment age across your portfolio. Plan capital expenditure by identifying aging systems before they fail. Our tool covers commercial brands like AAON, McQuay, Modine, and Reznor that other decoders miss.
Our HVAC age decoder covers all major residential and commercial brands. Select any manufacturer above to see detailed serial number decoding instructions, or simply enter your serial number and we'll identify the brand automatically.
Carrier (Bryant, Payne, Heil, Tempstar, Comfortmaker, Day & Night)
Trane (American Standard, Ameristar)
Lennox (Ducane, Armstrong Air, AirEase, Concord)
Goodman (Amana, Janitrol, QuietFlex)
Rheem (Ruud, WeatherKing, Raypak)
York (Coleman, Luxaire, Guardian, Evcon)
Daikin (McQuay)
Nordyne (Frigidaire, Maytag, Gibson, Miller, Intertherm)
Mitsubishi · LG · Fujitsu · MRCOOL · Samsung
Bosch (Buderus) · Friedrich (ClimateMaster) · Haier (GE HVAC)
AAON · Modine · Reznor · Bard · WaterFurnace
Rinnai · Lochinvar · Weil-McLain · Burnham · Whirlpool
Replacement strongly recommended. Major repairs usually exceed 50% of new equipment cost.
Approaching end of life. Start planning replacement. Weigh repair costs carefully.
Mid-life. Regular maintenance critical. Watch for efficiency decline and unusual noises.
Still in good service life. Maintain regularly. Most repairs are worthwhile investments.
If your air conditioner or heat pump was manufactured before 2010, it likely uses R-22 (Freon), which was phased out of production in January 2020. Remaining R-22 supplies cost $100–$200+ per pound, making a full recharge ($600–$2,400) often more expensive than replacing the entire system with a modern unit using R-410A or R-454B. Our decoder identifies R-22 systems and provides proper replacement guidance, including the MO99 (R-438A) drop-in protocol.
HVAC IQ Pro goes beyond age decoding. Our IoT sensors monitor your equipment 24/7 with AI-powered diagnostics that detect failures before they happen.