Air Temp
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Thread: Air Temp

  1. #1
    Join Date
    Jan 2008
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    Air Temp

    Been reading some of the posts re air temp at discharge vents. What is an acceptable temp range when both the heat pump and heat strips are running? The air discharging from my vents sometimes makes the vent too hot to touch for any length of time. Thanks.

  2. #2
    Air Temp out of a vent depends how close the vent is to your air handler. The further away you get the cooler you will find it. Not a big difference a few degrees. What you need to do is take a tempature rise on system. Go to the air handler and record temp in duct work near the air handler on both sides. you should get a temp difference of 45F to 55F. depends the size of unit and temp outside. Be asured that most furances have high limit protection. If it apears to be getting to hot and you feel safety is a issue call a professional for service.

  3. #3
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    Actually, air temperature is a factor of Btu output and air volume. In most residential applications there should not be much, if any, difference between closer outlets and further outlets. If there is, there is something wrong with the insulation or there is air infiltration into the system.

    Too hot of outlet air could be a sign of too little air. A dirty filter, indoor coil or any other obstruction to the airflow could be your problem. If it is not obvious, you should have an HVAC contractor diagnose your system for possible overheating factors that could cause major equipment failure.
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  4. #4
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    lugoff southcarolina
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    Wink

    air temp coming out will vary depending how kw stripes are and what your outside temp is;

  5. #5
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    Assuming you have proper air flow, a heat pump will put out 90 degree air at 32F outside temperature. If you have 15kw electric strips energized along with the heat pump, you'll get about another 34 degrees, for a total of 124 degrees roughly. Your hand is about 91 degrees, so this will feel very hot to the palm of your hand.

    Take care.

  6. #6
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    Feb 2004
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    Ohio
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    How long is the unit running during this process? Most stats stage the electric heat on should not all come on at once, if is thats not right. With heat pump running should only be a bank of heat coming on not all of them.

  7. #7
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    This HO gets 120* at the farthest register when both are running.

  8. #8
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    Quote Originally Posted by gary_g View Post
    you'll get about another 34 degrees, for a total of 124 degrees roughly.

    Take care.
    Your ASSUMING it has about 1400 CFM of air flow.
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  9. #9
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    Quote Originally Posted by beenthere View Post
    Your ASSUMING it has about 1400 CFM of air flow.
    Yes. I provided a ballpark temperature based on 1400 CFM. If it were 1200 CFM, the difference would be only 6 degrees.

  10. #10
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    Around here, 2.5 and some 4 ton units have 15 KW.
    Makes a big difference on discharge temp
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  11. #11
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    Quote Originally Posted by beenthere View Post
    Around here, 2.5 and some 4 ton units have 15 KW.
    Makes a big difference on discharge temp
    I am close to you, about 20 miles away or so (Bel Air, MD). I do indeed have 15kw in my new 3-ton heat pump.

    Without any info from the OP, I was trying to ballpark a temperature for her.

    Take care.

  12. #12
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    Quote Originally Posted by gary_g View Post
    I am close to you, about 20 miles away or so (Bel Air, MD). I do indeed have 15kw in my new 3-ton heat pump.

    Without any info from the OP, I was trying to ballpark a temperature for her.

    Take care.
    Ballpark temps, are like ballpark guesses at whats wrong with the system.

    WAG
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  13. #13
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    Quote Originally Posted by beenthere View Post
    Ballpark temps, are like ballpark guesses at whats wrong with the system.

    WAG
    The OP asked:

    "What is an acceptable temp range when both the heat pump and heat strips are running?"

    I replied with an acceptable temperature based on 15kw and proper air flow. Neither the OP nor I stated "whats wrong with the system".

    Take care.

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