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Is this acceptable HVAC performance? nospam 08-08-2007
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Posted by on August 8, 2007, 4:45 pm
I just had a new HVAC system installed in a new house and have not paid for
it yet. Today the temperature is 100 outside. I have my thermostat set to
77 and the actual temperature is 81. (This is upstairs, downstairs a
separate system is maintaining the selected temperature.)

I am getting about a 20 degree drop. Is that acceptable or should the
system be doing better?

Thanks for any help!

Posted by DerbyDad03 on August 8, 2007, 4:54 pm
On 8 Aug, 16:45, nos...@aol.com wrote:
> I just had a new HVAC system installed in a new house and have not paid for
> it yet. Today the temperature is 100 outside. I have my thermostat set to
> 77 and the actual temperature is 81. (This is upstairs, downstairs a
> separate system is maintaining the selected temperature.)
>
> I am getting about a 20 degree drop. Is that acceptable or should the
> system be doing better?
>
> Thanks for any help!

How long has it been running? What was the temp when you begin to
cool it down?

It could take many, many, many hours to drop a 100 degree space, with
all it's 100 degree furnishings, the full 23 degrees.




Posted by udarrell on August 8, 2007, 6:22 pm
DerbyDad03 wrote:

>On 8 Aug, 16:45, nos...@aol.com wrote:
>
>
>>I just had a new HVAC system installed in a new house and have not paid for
>>it yet. Today the temperature is 100 outside. I have my thermostat set to
>>77 and the actual temperature is 81. (This is upstairs, downstairs a
>>separate system is maintaining the selected temperature.)
>>
>>I am getting about a 20 degree drop. Is that acceptable or should the
>>system be doing better?
>>
>>Thanks for any help!
>>
>>
>
>How long has it been running? What was the temp when you begin to
>cool it down?
>
>It could take many, many, many hours to drop a 100 degree space, with
>all it's 100 degree furnishings, the full 23 degrees.
>
>
In addition, if everything in the home is loaded with the latent heat of
humidity it will take many times longer to pull the sensible temp
reading down.
Also, the upstairs area usually has a greater heat-gain than the lower
floor area.

http://www.udarrell.com/latent_heat_condensation.html

What SEER Rating at 82-F ambient is the new unit?

Higher ambient (outdoor Temps) can considerably lower the capacity of an
82-F outdoor temp Rated Ultra High SEER Rated unit.
In very hot & especially humid climate zones, I would go primarily by
the higher outdoor 95-F "EER Ratings & BTUH performance at those very
high application load conditions." I also hope your new unit has a
Scroll compressor & a TXV metering device ahead of the E-Coil.
- udarrell

--
WISDOM PRINCIPLE DIRECTED EMPOWERMENT COMMUNICATIONS -
THE REAL POLITICAL ISSUES and WISDOM BASED PEOPLE EMPOWERMENT

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Reality Is Not An Easy Thing To Be Confronted With, or to Accept!

Posted by Moe Jones on August 8, 2007, 5:56 pm
nospam@aol.com wrote:
> I just had a new HVAC system installed in a new house and have not
> paid for it yet. Today the temperature is 100 outside. I have my
> thermostat set to 77 and the actual temperature is 81. (This is
> upstairs, downstairs a separate system is maintaining the selected
> temperature.)
>
> I am getting about a 20 degree drop. Is that acceptable or should the
> system be doing better?
>
> Thanks for any help!

If you realy have the question if the upstairs unit has been properly charge
is have a heat load done to your home.

Also have your system checked to make sure ther is no problems.

--
Moe Jones
HVAC Service Technician
Energy Equalizers Inc.
Houston, Texas
www.EnergyEqualizers.com



Posted by ransley on August 8, 2007, 6:03 pm
> nos...@aol.com wrote:
> > I just had a new HVAC system installed in a new house and have not
> > paid for it yet. Today the temperature is 100 outside. I have my
> > thermostat set to 77 and the actual temperature is 81. (This is
> > upstairs, downstairs a separate system is maintaining the selected
> > temperature.)
>
> > I am getting about a 20 degree drop. Is that acceptable or should the
> > system be doing better?
>
> > Thanks for any help!
>
> If you realy have the question if the upstairs unit has been properly charge
> is have a heat load done to your home.
>
> Also have your system checked to make sure ther is no problems.
>
> --
> Moe Jones
> HVAC Service Technician
> Energy Equalizers Inc.
> Houston, Texaswww.EnergyEqualizers.com

Its set to 77 and its 81 , maybe the thermostat is not calibrated if
its cycling, turn it to 70, how hot was everything when you started
it, wait a few days and let it run continously, keep the thermostat
temp set low so it runs. My installer gave a guarnteed temp drop in
writing.


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