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Old 09-22-2010, 03:06 PM   #16
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Question about my heat pump


I recently inspected the air handler again. At the air intake of the unit, I saw that insulation is darker than else where. After removing the insulation, I saw a cavity at the spot where the metal duct is connected to the walls. I could see/hear/feel clearly the wind caused by air being drawn in from the cavity. I suppose this is contributing to my high bill. Also, this means that unfiltered air has been pulling in into the air handler. I have reason to believe that it has been like this since the beginning, which is 2006. So I guess I should also check the evaporation coil. I'm still looking at easy ways to get to the air intake side of the coil.

I wonder if anyone had experience with this kind of problem and how much it impacts the efficiency of the heat pump?

Another issue I noticed is that at two registers leading to two rooms, I find air leakage (enough to be felt by hand). And these are about the only registers that I checked. Are these very big sources of energy waste? Will it help very much if I check all the registers and seal any that leaks?

For one of the two registers I mentioned above, when viewed from the room, I see some soot like dark spots. What is the implication of this?


Last edited by deerhunter; 09-22-2010 at 03:10 PM.
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Old 09-22-2010, 05:52 PM   #17
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Question about my heat pump


Sealing air leaks will save a lot on your heating and cooling bills.

The soot like substance. Could just be the dust that is being burnt by the heating coils, when its pulling in that unfiltered air.
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Old 09-23-2010, 01:20 PM   #18
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Question about my heat pump


I'm planning to check all the registers for leakage. This would mean that I will disturb quite some blown in insulation. What should I do to restore the insulation? Shall I simply try to put back the insulation I removed? After being disturbed, the insulation will be a little compressed and I always find it look thinner after I restore it. Also, when I spread it to cover the exposed spots, it may not be as even as before.

May be I can add some fiber glass batt to compensate for the compressed insulation?
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Old 09-23-2010, 06:17 PM   #19
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Question about my heat pump


Yes. You can lay batts over it. Just use the batts that don't have a vapor barrier.
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Old 09-24-2010, 04:31 PM   #20
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Question about my heat pump


I just called in the professional to look at the air leak. The experience had been really frustrating. He insisted that the air leak isn't a problem. I don't have a camcorder right now to show you what's happening up there, but the bottom line is that there's a hard to reach spot where I can clearly see the insulation there vibrates with the wind caused by AH pulling air in (from attic). If I drop a piece of insulation in there, it got suck right in. As much as I wondered where that piece of insulation (and pieces before that) ended up, the HVAC guy had no problem with that. He told me that he had checked the pressure and the gauge readings were OK, and that's good enough for him.

One more thing, when I called them, I was given the impression that since they installed the unit, and since this problem should definitely been there since the beginning, the service will be free. But before the guy left, when I asked, he assured me that every time they do a service, they don't work for free. So I'm here regretting ever called them.
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Old 09-24-2010, 05:54 PM   #21
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Question about my heat pump


Your probably going to need to talk to the owner of the company.

It probably isn't an easy thing to fix. And that tech didn't want to get stuck doing it.
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Old 09-28-2010, 08:48 PM   #22
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Question about my heat pump


Till today I've been only looking at one of my two duct systems, the one for the larger heat pump. There is a smaller (2 tons) system for the up stairs. I just looked at the wall cavity return and realized that this one is at least as bad as the bigger one. I have attached a picture of the connection of the metal duct to the wall cavity. Gaps can be seen clearly along the edge. Is this common practice of HVAC professionals? I mean leaving such gaps at air return duct? I think it shouldn't, otherwise why take the trouble of sealing smaller gaps else where?
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Old 09-28-2010, 08:55 PM   #23
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Nope. Ain't suppose to be done like that.

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