HVAC serial number lookup, find it, then check the warranty.

Use the manufacturer lookup for your brand

These are the manufacturers' own tools. We do not run the lookup for you and we never see your serial number. The Goodman and Amana tools load inside the page, so we could not read their fields; for every brand we describe only what the manufacturer's own page says.

Where the serial number is

The serial number is on the rating plate, a sticker or metal label on the equipment. The manufacturers we could read describe it this way:

• Outdoor air conditioners and heat pumps (Bryant): the rating plate is on the back of the unit, above the service valve connections.
• Outdoor units (Goodman): on the back side of the unit, slightly above the refrigerant valves.
• Furnaces (Bryant): a rating plate sticker on the inside of the front door panel, which comes off by turning the knobs on the front of the panel counterclockwise and pulling it toward you.
• Furnaces and air handlers (Goodman): on the rating plate on the inner wall. Goodman adds that a dealer should be involved in accessing the serial number.

Your installer may also have stapled the shipping box's traveler label to your paperwork, which carries the same numbers. Goodman notes many dealers do this, so you may not need to open the unit at all.

Can the serial number tell you the age?

Often, but not from us. Goodman says its serial number is a ten digit code that identifies the time the unit was produced, along with the model and many of its sub-components. None of the manufacturer pages we could read, for any brand on this page, prints the digit-by-digit rule for turning a serial number into a manufacture date. Third-party "decoder" charts exist, but they are reverse-engineered, change when a manufacturer changes its format, and are wrong often enough to cost someone a warranty claim. So this page does not decode serial numbers into dates.

What works instead:

1. Run the serial through the brand's warranty lookup above. A hit returns a warranty record, and the warranty start and end dates are the manufacturer's own dating of the unit.
2. Read the rating plate for any printed date. Some labels carry one; many do not.
3. Ask your installing dealer or look at the installation invoice, permit and warranty certificate, which carry the install date that the warranty runs from.
4. If a lookup says nothing was found, check you typed the number exactly (Carrier says to re-enter it and, failing that, to contact the installing dealer or consult the warranty certificate).

Lennox serial formats

Lennox publishes the shape of its serial numbers next to its lookup, using # for a digit and A for a letter: ####A#####, A##A###### and AA##A#####. Registration numbers are a separate thing printed on the warranty certificate: ######, AAAAAA, #A#A#A or A#A#A#. That tells you whether what you copied looks like a serial or a registration number, not when the unit was built. Details are on our Lennox warranty lookup page.

What a warranty lookup does and does not show

Carrier and Bryant say plainly that their lookup is "a guide": results display only the general parts warranties, there may be other specific warranties on your record, and the certificate that came with the equipment is the document to rely on. California and Quebec residents may have additional coverage. A result also depends on whether the product was registered; for the registration windows see the HVAC warranty registration deadline calculator.

Worked example

A homeowner has a Bryant heat pump installed on March 3. The outdoor rating plate on the back lists a serial number. The Bryant page asks for that serial number and whether the visitor is the original purchaser. If the system was registered within 90 days of installation (by about June 1), Bryant says the product typically carries a 10 year parts limited warranty; otherwise 5 years. Without registration the lookup can still return a record, but the longer term may not apply, so the date the equipment was registered matters more than the date it was built.

What this page does not cover

• It does not decode serial numbers into manufacture dates, because no brand here publishes the rule on a page we could read.
• It does not cover brands we could not source (for example York, American Standard, Daikin, Mitsubishi, Fujitsu or Payne).
• It cannot confirm that a lookup result is complete; the manufacturer says its own results may be.

FAQ

Where is the serial number on an air conditioner or heat pump?

On the rating plate on the outdoor unit. Bryant says it is on the back of the unit above the service valve connections, and Goodman says slightly above the refrigerant valves on the back side.

Where is the serial number on a furnace?

On the rating plate. Bryant says the sticker is inside the front door panel; Goodman says it is on the inner wall of the furnace or air handler and that a dealer should be involved in accessing it.

Can I find out how old my HVAC unit is from the serial number?

Goodman says its ten digit serial number identifies when the unit was produced, but none of the manufacturer pages we read publish the digit by digit rule. Use the brand warranty lookup, a printed date on the rating plate, or your installation paperwork instead.

What does a Lennox serial number look like?

Lennox lists three serial number shapes next to its lookup, written with # for a digit and A for a letter: ####A#####, A##A###### and AA##A#####.

How do I check my Trane ductless warranty?

Trane says to enter the serial number followed by a dash and then the model number for a new ductless system, for example 5001234T-MSZ-GE25VA-E1.

Does a warranty lookup show every warranty on my equipment?

Not necessarily. Carrier and Bryant say results display only general parts warranties and that other specific warranties may differ, so the warranty certificate is the document to rely on.

Sources

Retrieved 2026-11-01. Each link was opened and the figures on this page were checked against the text next to it.

• Bryant: HVAC Warranty Information: Rating plate location for outdoor units and furnaces, the lookup fields, and the "guide" disclaimer.
• Carrier: Warranty Lookup: Serial number and original-purchaser fields, "no results" guidance, and the lookup disclaimer.
• Lennox: Warranty Lookup: Serial number and registration number formats, and the lookup options.
• Trane: Warranty and Registration: Ductless serial-plus-model entry format.
• Goodman: How can I confirm the model and serial numbers for my heating system?: Furnace and air handler rating plate, ten digit code statement and traveler label.
• Goodman: How can I confirm the model and serial numbers for my cooling system?: Outdoor unit rating plate location.
• Ruud: Verify your Heating and Cooling Warranty Registration: Serial number entered with no spaces.
• Goodman: How can I check if my Goodman brand products have limited warranty coverage?: Online confirmation of coverage using the warranty look-up tool.
• Rheem: Warranty and Registration: Serial number required to verify a warranty.