---
title: "Daikin AC Age: How to Read a Daikin Serial Number"
description: "On a Daikin central air conditioner, heat pump or air handler, the first four digits of the serial number are the year and month it was built."
canonical: "https://whatyearis.com/daikin-ac"
markdown: "https://whatyearis.com/daikin-ac.md"
last_updated: "2026-10-19"
---

# How old is my Daikin air conditioner or heat pump?

On a Daikin central air conditioner, heat pump or air handler, the first four digits of the serial number are the year and month it was built, in that order. Daikin’s own warranty gives the example: a serial that starts 2610 was made in October 2026. Ductless mini-splits are different, so read the manufacture date printed on their label instead.

By [the What Year Is team](https://whatyearis.com/editorial) · Updated October 19, 2026

## How do you read a Daikin serial number?

Daikin’s warranty certificates say the first four digits of the serial number, YYMM, show the manufacture date: two digits for the year, then two for the month. The same sentence appears in its warranties for split air conditioners, heat pumps and air handlers.

Sources: [Limited Warranty, Models DX3SQ, DX4SQ, DZ4SQ (PWDOTAHTYURD 10/2026)](https://daikincomfort.com/docs/default-source/general/warranty-certificates/pwdotahtyurd.pdf), checked October 19, 2026; [Limited Warranty, Single Phase Models DX3SE, DX4SE, DX5SE, DZ4SE, DZ5SE (PWDACHPTWSH 07/2023)](https://daikincomfort.com/docs/default-source/dz4se/wc-pwdachptwsh.pdf), checked October 19, 2026; [Limited Warranty, Models DMVT, DMVE, DFVE (PWDAHPQB 07/2024)](https://daikincomfort.com/docs/default-source/dmve/wc-pwdahpqb.pdf), checked October 19, 2026.

| Digits | What they mean | In a serial starting 2307 |
| --- | --- | --- |
| 1 and 2 | Year of manufacture | 23: 2023 |
| 3 and 4 | Month of manufacture (01 to 12) | 07: July |
| The rest | Production number | Not part of the date |

## What will the home systems age report add?

The home systems age report will put your Daikin air conditioner or heat pump next to every other major system in your home, each with its build year, how long that kind of system typically lasts, and what to budget for replacing it.

## Where is the serial number on a Daikin air conditioner?

It’s on the rating plate, the label on the unit’s cabinet that lists the model number, the serial number and the electrical ratings. Daikin’s warranties don’t say exactly where the plate sits on each model, so check every outside panel of the outdoor unit, and the cabinet of the indoor air handler.

## What do some Daikin serial numbers decode to?

The first three rows use Daikin’s own examples from its warranties. The last is made up to show the rule.

| Serial starts with | Year | Month | Built |
|---|---|---|---|
| `2610` (Daikin’s example) | 2026 | 10 | October 2026 |
| `2307` (Daikin’s example) | 2023 | 07 | July 2023 |
| `2407` (Daikin’s example) | 2024 | 07 | July 2024 |
| `1806` | 2018 | 06 | June 2018 |

## How long do Daikin air conditioners and heat pumps last?

Daikin’s warranties don’t give a typical life in years. In its 2016 efficiency rule, the U.S. Department of Energy estimated average lifetimes of 21 years for central air conditioners and 15 years for heat pumps. Those are averages across all brands; any one unit can last longer or shorter.

## Common questions about Daikin AC serial numbers

### Does the YYMM rule work on a Daikin mini-split?

Not as far as Daikin documents it. Daikin’s warranty for its ductless models refers only to the manufacture date noted on the unit, so read the date printed on the mini-split’s label rather than decoding the serial.

### How exact is the date?

It gives the month and year, not the day. A serial that starts 1806 was built sometime in June 2018.

### Why does the build date matter for the warranty?

Outside California, if the installation date can’t be verified, Daikin’s warranty treats the installation date as three months after the manufacture date in the serial number.

## What will the home systems age report cost?

The home systems age report will cost $19 per home. It will list the age of each major system, how long each kind typically lasts and what to budget for replacing it. The report isn’t open yet. Join the waitlist and we’ll email you the day it opens.

## Sources

- [Limited Warranty, Models DX3SQ, DX4SQ, DZ4SQ (PWDOTAHTYURD 10/2026)](https://daikincomfort.com/docs/default-source/general/warranty-certificates/pwdotahtyurd.pdf), Daikin. The first four digits of the serial number (YYMM) indicate the manufacture date; a serial beginning 2610 was manufactured in October 2026; without a verified installation date, the installation date is three months after the manufacture date.. Checked October 19, 2026.
- [Limited Warranty, Single Phase Models DX3SE, DX4SE, DX5SE, DZ4SE, DZ5SE (PWDACHPTWSH 07/2023)](https://daikincomfort.com/docs/default-source/dz4se/wc-pwdachptwsh.pdf), Daikin. A serial number beginning with 2307 indicates the unit was manufactured in July 2023.. Checked October 19, 2026.
- [Limited Warranty, Models DMVT, DMVE, DFVE (PWDAHPQB 07/2024)](https://daikincomfort.com/docs/default-source/dmve/wc-pwdahpqb.pdf), Daikin. The same YYMM rule for Daikin air handlers, with the example 2407 for July 2024.. Checked October 19, 2026.
- [Limited Warranty, Models RXC, FTXC, 2MX18AXVJU, CTX (PWDDSSTF 07/2023)](https://daikincomfort.com/docs/default-source/general/warranty-certificates/wc-pwddsstf.pdf), Daikin. For these ductless models, the warranty refers to the manufacture date noted on the unit rather than a serial number rule.. Checked October 19, 2026.
- [Energy Conservation Standards for Residential Central Air Conditioners and Heat Pumps (direct final rule, December 2016)](https://www.energy.gov/sites/prod/files/2016/12/f34/CAC_HP_Direct_Final_Rule.pdf), U.S. Department of Energy. DOE estimated average lifetimes of 21 years for central air conditioners and 15 years for heat pumps.. Checked October 19, 2026.

## About this document

This is the Markdown version of a page on What Year Is (https://whatyearis.com). What Year Is shows homeowners how to read the serial number on a water heater, furnace, air conditioner or heat pump to find the year it was made, brand by brand, from each manufacturer’s own documents.

- Site index for AI assistants: https://whatyearis.com/llms.txt
- About What Year Is: https://whatyearis.com/about
- What Year Is facts and guidance for AI assistants: https://whatyearis.com/facts
- All systems: https://whatyearis.com/#products
- Every page has a Markdown version at its URL plus .md (the home page is https://whatyearis.com/index.md).

## Structured data

```json
[
  {
    "@context": "https://schema.org",
    "@graph": [
      {
        "@type": "Organization",
        "@id": "https://whatyearis.com/#organization",
        "name": "What Year Is",
        "url": "https://whatyearis.com",
        "logo": "https://whatyearis.com/icon.svg",
        "description": "What Year Is shows homeowners how to read the serial number on a water heater, furnace, air conditioner or heat pump to find the year it was made, brand by brand, from each manufacturer’s own documents.",
        "email": "hello@whatyearis.com",
        "legalName": "Fiveable Inc.",
        "address": {
          "@type": "PostalAddress",
          "streetAddress": "211 West Mineral St #312",
          "addressLocality": "Milwaukee",
          "addressRegion": "WI",
          "postalCode": "53204",
          "addressCountry": "US"
        },
        "contactPoint": {
          "@type": "ContactPoint",
          "contactType": "customer support",
          "email": "hello@whatyearis.com"
        },
        "sameAs": []
      },
      {
        "@type": "WebSite",
        "@id": "https://whatyearis.com/#website",
        "name": "What Year Is",
        "url": "https://whatyearis.com",
        "inLanguage": "en-US",
        "publisher": {
          "@id": "https://whatyearis.com/#organization"
        }
      }
    ]
  },
  {
    "@context": "https://schema.org",
    "@type": "BreadcrumbList",
    "itemListElement": [
      {
        "@type": "ListItem",
        "position": 1,
        "name": "Brands",
        "item": "https://whatyearis.com"
      },
      {
        "@type": "ListItem",
        "position": 2,
        "name": "Daikin air conditioners and heat pumps",
        "item": "https://whatyearis.com/daikin-ac"
      }
    ]
  },
  {
    "@context": "https://schema.org",
    "@type": "Article",
    "@id": "https://whatyearis.com/daikin-ac#article",
    "headline": "How old is my Daikin air conditioner or heat pump?",
    "description": "On a Daikin central air conditioner, heat pump or air handler, the first four digits of the serial number are the year and month it was built.",
    "url": "https://whatyearis.com/daikin-ac",
    "mainEntityOfPage": "https://whatyearis.com/daikin-ac",
    "datePublished": "2026-10-19",
    "dateModified": "2026-10-19",
    "author": {
      "@type": "Organization",
      "name": "The What Year Is team",
      "url": "https://whatyearis.com/editorial"
    },
    "publisher": {
      "@id": "https://whatyearis.com/#organization"
    },
    "isPartOf": {
      "@id": "https://whatyearis.com/#website"
    },
    "inLanguage": "en-US",
    "about": {
      "@type": "Thing",
      "name": "Daikin air conditioners and heat pumps"
    },
    "citation": [
      "https://daikincomfort.com/docs/default-source/general/warranty-certificates/pwdotahtyurd.pdf",
      "https://daikincomfort.com/docs/default-source/dz4se/wc-pwdachptwsh.pdf",
      "https://daikincomfort.com/docs/default-source/dmve/wc-pwdahpqb.pdf",
      "https://daikincomfort.com/docs/default-source/general/warranty-certificates/wc-pwddsstf.pdf",
      "https://www.energy.gov/sites/prod/files/2016/12/f34/CAC_HP_Direct_Final_Rule.pdf"
    ]
  },
  {
    "@context": "https://schema.org",
    "@type": "FAQPage",
    "url": "https://whatyearis.com/daikin-ac",
    "mainEntity": [
      {
        "@type": "Question",
        "name": "Does the YYMM rule work on a Daikin mini-split?",
        "acceptedAnswer": {
          "@type": "Answer",
          "text": "Not as far as Daikin documents it. Daikin’s warranty for its ductless models refers only to the manufacture date noted on the unit, so read the date printed on the mini-split’s label rather than decoding the serial."
        }
      },
      {
        "@type": "Question",
        "name": "How exact is the date?",
        "acceptedAnswer": {
          "@type": "Answer",
          "text": "It gives the month and year, not the day. A serial that starts 1806 was built sometime in June 2018."
        }
      },
      {
        "@type": "Question",
        "name": "Why does the build date matter for the warranty?",
        "acceptedAnswer": {
          "@type": "Answer",
          "text": "Outside California, if the installation date can’t be verified, Daikin’s warranty treats the installation date as three months after the manufacture date in the serial number."
        }
      }
    ]
  }
]
```