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VisionPro IAQ Steven 07-22-2009
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Posted by Steve on July 22, 2009, 10:00 pm
I can only find info on the 02 with a cursary search... What are you doing
with it?? What are you needing it to do?? what type of system?? what
accessories?? etc........
There may be something else that Honeywell makes that will do what you need
it to.

> It's not a trick question, I have seen both units & cant determine what
> the difference is..... Perhaps a newer revision or features....
>> On Wed, 22 Jul 2009 14:09:13 -0400, "zero"
>>>>> Hi,
>>>>> What is the difference between these two versions of the Honeywell
>>>>>VisionPro IAQ thermostats? YTH9421C1002 & YTH9421C1004
>>>> The last digit.
>>> Hmm... this might be a trick question being he's asking
>>>about the difference between the two.
>>>My guess is a difference of two units. :o)
>>>-zero
>> Oh.
>> Nevermind.
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>



Posted by Tony Hwang on July 26, 2009, 12:21 am
Steven wrote:
> Hi,
> What is the difference between these two versions of the Honeywell
> VisionPro IAQ thermostats? YTH9421C1002 & YTH9421C1004
>
>
Hi,
Of my head, possible difference is number of stages in heating/colling
cycle, gas or electric, etc.

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