AirTemp Furnace age

[jharrison (John Harrison, CMI)]

AirTemp was made by Chrysler and numbered their Furnaces the same as their cars.

The info that I have is that the fith digit is the year

AirTemp
Model: 42144C1421
Serial: 391123

House was build in 1979
So my choices are 1974, 1984, 1994, 2004 ???
I am thinking a replacement of the original furnace in 1994 would seem the most reasonable.

Any other input would be nice. Thanks

[ldapkus1]

Preston’s lists it as 1977. 140,000 BTU

[jharrison (John Harrison, CMI)]

@ldapkus1

Preston’s lists it as 1977. 140,000 BTU

Well that is a lot closer to the build date than the information that I have

Thanks

[jmoore5 (Jeffrey Moore, AZ#49250)]

John,

My understanding that you look at serial number to use for date purposes not model number

http://www.buildingcenter.org/

[ccurrins (Christopher Currins, CMI)]

@jmoore5

John,

My understanding that you look at serial number to use for date purposes not model number

http://www.buildingcenter.org/

Yep, not the model number.

[ldapkus1]

The Preston Guide lists manufactured date according to model number.

[ccurrins (Christopher Currins, CMI)]

@ldapkus1

The Preston Guide lists manufactured date according to model number.

Oh, maybe I’ll get me one of them. :mrgreen: Very seldom have trouble determining age, unless they’re 30 years are older.

[ldapkus1]

@ccurrins

Oh, maybe I’ll get me one of them. :mrgreen: Very seldom have trouble determining age, unless they’re 30 years are older.

I bought one several years ago and never used it much. With a recent increase in commercial inspections, I got the latest Preston’s Guide and picked up RS Means Commercial Renovation Cost Data.