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  1. #1

    Vent Temp on New Install

    I just had a new Amana 18 Seer AC installed yesterday, they installed a completely new system including coil, furnace, copper, etc/. The inside temp in the morning is currently 76 but the vent temp is only 61. That seems too warm for the air coming out of the vents.

    They also told me they are coming back today to install a different thermostat but I dont see how that should affect the temp of the vent air.

    The system seems to be running at full speed so it seems to me something is not right. I was expecting the vent air to be around 50.

    Any thoughts?

  2. #2
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    Quote Originally Posted by RoadRashTX View Post
    I just had a new Amana 18 Seer AC installed yesterday, they installed a completely new system including coil, furnace, copper, etc/. The inside temp in the morning is currently 76 but the vent temp is only 61. That seems too warm for the air coming out of the vents.

    They also told me they are coming back today to install a different thermostat but I dont see how that should affect the temp of the vent air.

    The system seems to be running at full speed so it seems to me something is not right. I was expecting the vent air to be around 50.

    Any thoughts?
    Guessing that the dip switches at the air handler are not set properly, and you're getting too high of an air flow.

  3. #3
    Join Date
    Dec 2002
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    Quote Originally Posted by RoadRashTX View Post
    I was expecting the vent air to be around 50.

    Any thoughts?
    Don't even expect the vent temps to be that cold in the new stuff, only the old school systems did that, get yourself a "good" temp checker and check the TD "Temperature Differential" between the return right at the furnace or air handler and the supply right after the coil. Humidity in the home can have a huge factor on a TD also, when they come back just ask them politely if they could please recheck the charge, and make sure when they do, they have a clamp on temp meter of some sort clamped onto the line, if not there guessing.
    __________________________________________________ ____________________________
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  4. #4
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    Don't expect the supply register temp to be 26° cooler then the return temp.
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  5. #5
    Thanks for the help guys. I grabbed a couple of different thermometers I had and just rechecked the vent temp. One thermo says 48 and the other says 52. They also just came out and changed out the thermostat with one that works with the variable speed
    Last edited by RoadRashTX; 07-14-2009 at 11:36 AM.

  6. #6
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
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    Hmm...I read through the entire thread and didn't pick up any indication the OP was uncomfortable, just that the air temperature at one of his supply registers concerned him.

    Many things affect air outlet temperatures; humidity, heat gain to ducts run through attics, distance of duct runs, airflow setting of blower, cleanliness of filter, refrigerant charge, etc. With a properly installed and operating system, supply air temperatures will vary with the heat load of the house, including moisture heat load. Also, as air temperatures increase outdoors, the ability of the system to reject heat from the house via the condenser will decrease at some point. This can also affect supply air temperatures.

    Bottom line for homeowner: if it is working well, keep it clean! Clean systems are happy systems.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  7. #7
    Join Date
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    Quote Originally Posted by shophound View Post
    keep it clean! Clean systems are happy systems.

    Your right! and this also goes for our body's this is why Mr. Bill don't drink or smoke and eats right so my system will be a happy one.
    __________________________________________________ ____________________________
    “Reality is merely an illusion, albeit a very persistent one.” –Albert Einstein

    “Experience is a hard teacher because she gives the test first, the lesson afterwards.”-Vernon Law

  8. #8
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    Quote Originally Posted by Mr Bill View Post
    Your right! and this also goes for our body's this is why Mr. Bill don't drink or smoke and eats right so my system will be a happy one.
    If I didn't have drinking, smoking cigs, and White Castle cheeseburgers to look forward to when I got home, I would probably kick my dog or something.
    I will agree that preventative maintenance is the key to longevity though. I take an aspirin every night before bed.
    Sound installation practices is the key to success. Equipment is only as good as the person installing it.

    If I can't fix it, it ain't broke.

  9. #9
    Hey all,

    One other quick question. What is the coolest I should expect my interior temp to be on a day where it is 104 outside (Texas)?

    I had the AC set at 78 all day and I just got home and it is showing 82, is that reasonable?

    thanks

  10. #10
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    A 22° difference on a 104°, I think thats pretty good.
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  11. #11
    I also assume that attic temp also plays a big part in interior temp. Currently we only have 2 turbines on our house and I dont think they are cooling the attic efficiently. I am considering getting 1 or 2 additional ones installed. Any opinions?

    Also, what do you guys think about solar screens? a little off topic.

  12. #12
    Join Date
    Jan 2004
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    Before you add more.

    Make sure you have enough air coming into the attic for the 2 you have to work.
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  13. #13
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    Quote Originally Posted by RoadRashTX View Post
    Hey all,

    One other quick question. What is the coolest I should expect my interior temp to be on a day where it is 104 outside (Texas)?

    I had the AC set at 78 all day and I just got home and it is showing 82, is that reasonable?

    thanks
    It's only reasonable if you're comfortable inside at 82 degrees when it is 104 degrees outside.

    I would find it unacceptable. I can hold 75 in my house when it is 104 outside. 75 degrees at 44% relative humidity feels very nice when it is 104 degrees outside. 82...I'd be climbing the walls.

    Solar screens are not exactly off topic, for they can help reduce heat gain through windows, especially single pane windows. They will reduce the light level from the windows where they are installed, but Texas summers are glary...sun screens can bring some welcome relief in two ways. They will not perform on the same level as double pane low e argon filled thermally improved frame windows will, but they are a less expensive alternative.
    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

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