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TOPIC: HVAC Differentials

HVAC Differentials 12 years 3 weeks ago #24107

Does anyone have any literature on HVAC differentials?  I am looking for something on AC and Furnaces, for med and high efficiency units.  I know that AC should be between 15-20ºF and cant remember the range for furnaces.  Also I was thinking that high efficiency units were different also.

Karma points may be awarded!!!  lol  ;)


Thanks

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Re: HVAC Differentials 12 years 3 weeks ago #24128

John,
I thought the differential for AC was 10, heat was 20 or greater? 

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Re: HVAC Differentials 12 years 3 weeks ago #24158

John,
I thought the differential for AC was 10, heat was 20 or greater? 


I think that is for high efficiency units, which is why I was asking for that also.  As for heat, I couldn't remember if it was anything over 20 or if it had a range too.

But now that you mentioned it, I think it is anything over 20.

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HLC Home Inspections LLC
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We are a licensed inspector for the state of Oklahoma.?  Our focus is Oklahoma City, Moore, Mustang, Yukon, Tuttle, and many other areas surrounding OKC.
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Re: HVAC Differentials 12 years 3 weeks ago #24159

John:
www.nachi.org/forum/f11/c-temperature-differential-6394/
Google turned up this nugget...with the links and such, I just figured it'd be better to let you wade through, and enlighten us all!  :)  You da MAN!  :D ;D :)

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Re: HVAC Differentials 12 years 3 weeks ago #24254

For an example if the return air for a furnace was 70 degrees and the supply discharge temp was only 90 degrees going to be some unhappy females in that home 90 degree air feels very cold in the winter months ;D

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Re: HVAC Differentials 12 years 3 weeks ago #24264

  • Tim
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John you should be getting the 15 - 20 with the AC, however heat is going to depend on the source
Gas or Electric coiled forced hot air can be substantial and with a heat pump it can be as little as 5 degrees

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