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Posted by on August 13, 2007, 11:05 pm
> I just got 2 new HVAC systems installed (upstairs and downstairs), and
> I noticed during the day, the downstairs unit doesn't want to hold the
> temperature.
So have the installing company diagnose and correct the issue.
> The other day, I had it set for 78, and it crept up to
> 82 (starting around 3PM), and didn't get back below 80 until 10PM.
>
> Now it's hot here in Atlanta for the past few days, but these are new
> units (2.0 ton downstairs and 2.5 upstairs). The upstairs unit seems
> to maintain the temperature without a problem.
>
> Today I set both units at 75 (cooler than usual - just a test to see
> if they hold). The upstairs is still 75, the downstairs is 78.
>
> Also, in the evenings (with the downstairs unit constantly running) I
> sometimes feel a little warm (not terrible) sitting in the den, but
> then feel a burst of cool air (like the unit just clicked on).
>
> Any ideas what could be going on?
I have lots of ideas, however, the exact problem can't be located right now.
Ya see, I sent my crystal ball in for calibration last week. So you might
check back in a week or so.
> Could the weather (97 outside right
> now) be the culprit? (Though my upstairs maintains without a problem)
Don't know, what design temperatures are listed in your manual J calcs?
> Or the thermostat? Or bad unit?
Or an installation issue
Or a refrigeration issue
Or a ducting issue
How many guesses would you like?
> The installer says he is going to try some "expansion valve" at the
> coils - does this make sense to anyone?
It makes sense that they don't know what the actual problem is... as if they
knew, they wouldn't be *trying* anything. They would be correcting the real
issue and know what that real issue was by doing a proper diagnosis.
Any chance you went with the lowest bidder?
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