Furnaces, AC and heat pumps

How old is my Daikin furnace, AC or heat pump?

Daikin heating and cooling equipment carry the build date inside the serial number. We know one serial format for this brand; the decoder tries each one and shows every reading that fits.

How to read a Daikin serial number

Daikin ductless units built in Japan or Thailand do not encode the date in the serial. Look for the MFG. DATE line on the plate instead.

Year and month, all digits (2012 to today (furnaces, AC and heat pumps built by Goodman))

The first two digits are the year and the next two are the month. The rest is a production number.

1602393269 reads as February 2016.

Two sources agree Building Intelligence Center, HVACbase, PickHVAC

Where to find the serial number

Furnace: inside the front panel or on the side of the cabinet.
AC, heat pump or mini-split: the plate on the outdoor unit, usually near the line connections.
Use the line marked Serial No. or S/N, not the model number. If the plate prints a manufacture date, use that.

How long should it last?

Typical life of a furnace: 15 to 20 years

A gas furnace usually lasts 15 to 20 years. Well-maintained units in mild climates reach 25; units that run hard with dirty filters fail sooner.

How long does a furnace last? · Should I replace my furnace? · HVAC.com, Lennox, InterNACHI (15-25)

Typical life of a central air conditioner: 12 to 15 years

A central AC condenser usually lasts 12 to 15 years. In hot climates where it runs most of the year, 10 is more typical; in the north, 20 is possible.

How long does a central air conditioner last? · Should I replace my air conditioner? · Bryant, Lennox, InterNACHI (7-15)

Typical life of a heat pump: 10 to 15 years

An air-source heat pump usually lasts 10 to 15 years. It runs in both seasons, so it logs more hours than a furnace or an AC alone.

How long does a heat pump last? · Should I replace my furnace? · Trane, Lennox, Bryant, InterNACHI

Typical life of a ductless mini-split: 10 to 15 years

A ductless mini-split is a heat pump, so plan on 10 to 15 years, with 20 possible for a lightly used unit that is cleaned regularly.

How long does a ductless mini-split last? · Should I replace my air conditioner? · same range as air-source heat pumps

Should I replace it?

Should I replace my furnace? · Should I replace my air conditioner?

Parts that help it last

Furnace filters Check the size printed on the old filter and buy the same. A clogged filter is the most common cause of avoidable furnace trouble.
Leak alarm Useful near a high-efficiency furnace or an AC coil, where condensate drains can clog.

Check your model and size before you buy. Amazon links are affiliate links: as an Amazon Associate I earn from qualifying purchases.

Keep a record of your home

The age you just looked up is the kind of fact that gets lost. A written record of serial numbers, install dates, repairs and who did the work saves the next owner, inspector or insurer from guessing.

Keep This With the House

A lifetime logbook for the house, organized by system, with room for serial numbers, install dates, repairs and contractors. It stays with the house for the next owner.

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The House Is Fifty Years Old

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