Heat pump question

Posted by Jack on December 25, 2007, 8:18 am

My heat pump is only 2 years old. It is a Lennox 13 Seer and has a
variable speed air handler. It has provided adequate heat for our
house but the register temperature has never been higher than 86
degrees. I mentioned this to my HVAC contractor the other day and he
sent out a technician to check it. THe technician slowed down the fan
by 10% and the result is that my register temperature is not about 96
degrees.

I know that the outside unit can only produce a certain amount of heat
energy at the coil. By slowing the fan and allowing the air to spend
more time on the coil and, thus, raising the T, will the unit operate
more or less efficiently. i. e. is it going to cost more or less to
heat the house.

Any thoughts will be appreciated.

Posted by Mo Hoaner on December 25, 2007, 9:31 am

> My heat pump is only 2 years old. It is a Lennox 13 Seer and has a
> variable speed air handler. It has provided adequate heat for our
> house but the register temperature has never been higher than 86
> degrees. I mentioned this to my HVAC contractor the other day and he
> sent out a technician to check it. THe technician slowed down the fan
> by 10% and the result is that my register temperature is not about 96
> degrees.
> I know that the outside unit can only produce a certain amount of heat
> energy at the coil. By slowing the fan and allowing the air to spend
> more time on the coil and, thus, raising the T, will the unit operate
> more or less efficiently. i. e. is it going to cost more or less to
> heat the house.
> Any thoughts will be appreciated.

If it's not about 96 degrees, what is it about? You said it provided
adequate heat, but you bitched about it. The tech made the temperature of
the air at the register higher. I guess you'll need to read your electric
bill to figure the rest out.

http://tinyurl.com/yntxog

Posted by Zyp on December 25, 2007, 4:55 pm

Jack wrote:

Jack;

A heat pump is considerably more efficient than other modes of heat, but it
can be somewhat "drafty."

If it's heating your home adequatly, then good. If it seems drafty, try
moveing the diffuser vanes at the supply register to move the air away from
places where you sit. That may make it more comfortable.

--
Zyp

Posted by Jack on December 25, 2007, 8:28 pm

Sorry, I meant to say that, after slowing the fan 10% the register
temperature is now about 96 degrees

On Tue, 25 Dec 2007 13:18:08 GMT, jplasater@NOSPAMjuno.com (Jack)
wrote:

>My heat pump is only 2 years old. It is a Lennox 13 Seer and has a
>variable speed air handler. It has provided adequate heat for our
>house but the register temperature has never been higher than 86
>degrees. I mentioned this to my HVAC contractor the other day and he
>sent out a technician to check it. THe technician slowed down the fan
>by 10% and the result is that my register temperature is not about 96
>degrees.
>I know that the outside unit can only produce a certain amount of heat
>energy at the coil. By slowing the fan and allowing the air to spend
>more time on the coil and, thus, raising the T, will the unit operate
>more or less efficiently. i. e. is it going to cost more or less to
>heat the house.
>Any thoughts will be appreciated.

Posted by Bubba on December 26, 2007, 7:13 pm

On Wed, 26 Dec 2007 01:28:50 GMT, jplasater@NOSPAMjuno.com (Jack)
wrote:

>Sorry, I meant to say that, after slowing the fan 10% the register
>temperature is now about 96 degrees

Jack,
Believe it or not we Did figure that out.
Your unit temperatue should be whatever the performance charts say it
should be after you have taken static pressures, temperatures, wet
bulbs and superheat/subcooling readings.
Its Not Rocket Science, you know?
Bubba

>On Tue, 25 Dec 2007 13:18:08 GMT, jplasater@NOSPAMjuno.com (Jack)
>wrote:

>>My heat pump is only 2 years old. It is a Lennox 13 Seer and has a
>>variable speed air handler. It has provided adequate heat for our
>>house but the register temperature has never been higher than 86
>>degrees. I mentioned this to my HVAC contractor the other day and he
>>sent out a technician to check it. THe technician slowed down the fan
>>by 10% and the result is that my register temperature is not about 96
>>degrees.
>>I know that the outside unit can only produce a certain amount of heat
>>energy at the coil. By slowing the fan and allowing the air to spend
>>more time on the coil and, thus, raising the T, will the unit operate
>>more or less efficiently. i. e. is it going to cost more or less to
>>heat the house.
>>Any thoughts will be appreciated.

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