Why does an inspector note the age of a furnace alongside its condition?

Age and condition answer different questions and neither is sufficient alone. Condition describes what the unit is doing today: whether it fires, whether the heat exchanger shows visible distress, whether the cabinet and flue are sound. It cannot tell the client when the unit will stop working, because a furnace in apparently good condition can fail the following winter. Age supplies the missing dimension — where the unit sits within its typical service life — so a client can plan for a replacement that is statistically near rather than being surprised by it. Reporting both lets the client distinguish 'no defect observed today' from 'no expense likely soon', which are very different statements. What the inspector must not do is convert the pair into a prediction with a date attached, since that exceeds what was observed; the correct framing is remaining typical service life, expressed as a planning consideration.

Condition describes only what is observable today and cannot indicate when a unit will fail. Age places it within its typical service life, letting the client plan for replacement.

Inspectors report observed condition and, where determinable, equipment age. Age relative to typical service life supports the client's budget planning but does not by itself constitute a defect or a failure prediction.

Condition Is Today, Age Is Tomorrow. One says what you see; the other says what to budget for.

Data plate serial numbers usually encode manufacture date. Note that manufacture date is not installation date when the unit was a replacement.

• •Calling an old unit defective purely because of age
• •Reporting condition without age, leaving the client no planning basis
• •Converting the pair into a predicted failure date