2nd thermostat

Posted by rking on May 3, 2007, 2:54 pm

I am not an HVAC tech. I was wondering if it is possible to add a 2nd
thermostat to my HVAC system. Currently, I have a digital thermostat
downstair and was planning to add a 2nd one upstair. The reason for
this is because, during summer time, upstair will still be very hot
and the thermostat will shut down the AC since it has reach the set
temp downstairs. I plan to use one thermostat at a time only. During
daytime, it will be the one downstair and duirng night time it will be
upstair. I plan to connect the 2 in parallel. Do you see any problem
with this type of connections. I know there are wireless device out
there, but I still prefer hardwire.Appreciate any input on this.

Thanks
Tony

Posted by Noon-Air on May 3, 2007, 3:06 pm

sounds like its not a thermostat issue, so installing a 2nd stat won't help.
What you most probably have is a zoning issue.
Let me guess... 2 floors and only 1 system.
To correct your problems is not going to be cheap and will result in at the
very least, either having the ductwork re-designed/replaced with zoning
damper(s) and the appropriate returns and bypasses.
OR you can replace the downstairs system with a smaller one, install an
upstairs system, and redesign/replace all the ductwork for both floors
Either way, its not going to be cheap, and its not what you wanted to hear.
FWIW, I just quoted a simular type situation for 2 heat pump systems, with
the appropriate ductwork, and complete installation for around $15,000.

>I am not an HVAC tech. I was wondering if it is possible to add a 2nd
> thermostat to my HVAC system. Currently, I have a digital thermostat
> downstair and was planning to add a 2nd one upstair. The reason for
> this is because, during summer time, upstair will still be very hot
> and the thermostat will shut down the AC since it has reach the set
> temp downstairs. I plan to use one thermostat at a time only. During
> daytime, it will be the one downstair and duirng night time it will be
> upstair. I plan to connect the 2 in parallel. Do you see any problem
> with this type of connections. I know there are wireless device out
> there, but I still prefer hardwire.Appreciate any input on this.
> Thanks
> Tony
>

Posted by Noon-Air on May 3, 2007, 3:09 pm

> sounds like its not a thermostat issue, so installing a 2nd stat won't
> help.
> What you most probably have is a zoning issue.
> Let me guess... 2 floors and only 1 system.
> To correct your problems is not going to be cheap and will result in at
> the very least, either having the ductwork re-designed/replaced with
> zoning damper(s) and the appropriate returns and bypasses.
> OR you can replace the downstairs system with a smaller one, install an
> upstairs system, and redesign/replace all the ductwork for both floors
> Either way, its not going to be cheap, and its not what you wanted to
> hear.
> FWIW, I just quoted a simular type situation for 2 heat pump systems, with
> the appropriate ductwork, and complete installation for around $25,000.
> (sorry about the typo in the first try)

>>I am not an HVAC tech. I was wondering if it is possible to add a 2nd
>> thermostat to my HVAC system. Currently, I have a digital thermostat
>> downstair and was planning to add a 2nd one upstair. The reason for
>> this is because, during summer time, upstair will still be very hot
>> and the thermostat will shut down the AC since it has reach the set
>> temp downstairs. I plan to use one thermostat at a time only. During
>> daytime, it will be the one downstair and duirng night time it will be
>> upstair. I plan to connect the 2 in parallel. Do you see any problem
>> with this type of connections. I know there are wireless device out
>> there, but I still prefer hardwire.Appreciate any input on this.
>> Thanks
>> Tony

Posted by Bubba on May 3, 2007, 3:11 pm

wrote:

>sounds like its not a thermostat issue, so installing a 2nd stat won't help.
>What you most probably have is a zoning issue.
>Let me guess... 2 floors and only 1 system.
>To correct your problems is not going to be cheap and will result in at the
>very least, either having the ductwork re-designed/replaced with zoning
>damper(s) and the appropriate returns and bypasses.
>OR you can replace the downstairs system with a smaller one, install an
>upstairs system, and redesign/replace all the ductwork for both floors
>Either way, its not going to be cheap, and its not what you wanted to hear.
>FWIW, I just quoted a simular type situation for 2 heat pump systems, with
>the appropriate ductwork, and complete installation for around $15,000.

cheap bastard :-)
Bubba

Posted by Noon-Air on May 3, 2007, 5:44 pm

> wrote:

>>sounds like its not a thermostat issue, so installing a 2nd stat won't
>>help.
>>What you most probably have is a zoning issue.
>>Let me guess... 2 floors and only 1 system.
>>To correct your problems is not going to be cheap and will result in at
>>the
>>very least, either having the ductwork re-designed/replaced with zoning
>>damper(s) and the appropriate returns and bypasses.
>>OR you can replace the downstairs system with a smaller one, install an
>>upstairs system, and redesign/replace all the ductwork for both floors
>>Either way, its not going to be cheap, and its not what you wanted to
>>hear.
>>FWIW, I just quoted a simular type situation for 2 heat pump systems, with
>>the appropriate ductwork, and complete installation for around $15,000.

> cheap bastard :-)
> Bubba

Sorry, it was a typo... was supposed to be $25,000

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