# Goodman Furnace

**URL:** <https://forum.nachi.org/t/goodman-furnace/21033>\
**Category:** Inspecting HVAC Systems\
**Created:** [October 16, 2007, 5:45pm UTC](https://forum.nachi.org/t/goodman-furnace/21033 "2007-10-16T17:45:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![charper](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/charper/32/72_2.png) [@charper](https://forum.nachi.org/u/charper)\
**Post date:** [October 16, 2007, 5:45pm UTC](https://forum.nachi.org/t/goodman-furnace/21033/1 "2007-10-16T17:45:33Z")

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Anyone know age and btu’s?  
Goodman Electric  
Either  
A36-15 or  
835-15.  
Doesn’t show up in Prestons.

Thanks

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**Author:** ![mnahrgang](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mnahrgang/32/2365_2.png) [@mnahrgang](https://forum.nachi.org/u/mnahrgang)\
**Post date:** [October 16, 2007, 6:47pm UTC](https://forum.nachi.org/t/goodman-furnace/21033/2 "2007-10-16T18:47:54Z")

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\*\*Goodman \*\*First two digits of the serial number are the year. Second two are the month.

Btu rating is model number…i.e.; GMP075-3 (75,000 bonnet input) Compressor is same: serial # 9709088872 (yr1997 wk 09)

Tonnage is model # CK361C The first two numbers after the CK (letters) divided by 12 is tons. i.e.: 36 div by 12= 3 tons.

So based on this info, I would say it’s either 36000 or 35000 btu. That seems very small. I didn’t know they made them that small. You sure this isn’t an air conditioning unit? 3 Tons?

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**Author:** ![bwiley](https://avatars.discourse-cdn.com/v4/letter/b/8c91f0/32.png) [@bwiley](https://forum.nachi.org/u/bwiley)\
**Post date:** [October 16, 2007, 7:17pm UTC](https://forum.nachi.org/t/goodman-furnace/21033/3 "2007-10-16T19:17:30Z")

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A36 would be a 3 ton Goodman air handler.

You would need to determine the KW of the strip heaters.