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  1. #14
    Join Date
    Nov 2012
    Posts
    9
    Quote Originally Posted by jtrammel View Post
    You have a heat pump with electric resistance back up heat. When you turn the tstat setting up ~2-3F above inside temp the resistance heat comes on to catch up to the new set point so the air is warmer, when it gets to the same temp just the heat pump runs and the air doesn't feel as warm. The hissing noise is a defrost cycle to remove any built up frost or ice from the outdoor units heat transfer coil. In defrost the unit switches from heat mode to cool mode and the resistance heat comes on to temper the cooled air so it doesn't blow really cold air. Maybe the resistance heat is not coming on in defrost thus blowing cool air into the home while in defrost mode. The hissing sound is a normal noise for a heat pump in defrost. Heat pumps only blow out ~90F air when the resistance heat is not on so it does not "feel" very warm but does heat the house. Hope this explanation helps.
    jt, if you don't mind me calling you that, this went over my head a bit here, but I think I got the basics. However, the defrost part has me a bit confused, because:
    1. The noise was not there for the first week or two of running the furnace.
    2. Maybe this is irrelevant but generally it has not been cold enough to worry about freezing.

    Quote Originally Posted by OldSchoolMech View Post
    Buy a Thermometer and tell us what temps you are getting out of your register's. What type of heating did you have in your OLD house before this one?

    JT ^^^^^ Nailed it. Thats what I was thinking. I also don't think you are used to this style of heating
    Buy a thermometer and place it in the house here and compare it to the thermometer portion of the thermostat unit?

    As for the old house, not sure. It was a small 550 sq foot one bedroom apartment. For what it was worth, the unit was located in the bathroom ceiling. However, the furnace filter, which maintenance replaced one or twice a year no matter what, was located just outside the bathroom in what appeared to be a large heating vent the size of say a vent you would see in a drop ceiling in a business.This is not a house either. It is a rental property with 4 or 5 buildings. Each building contains four town house units.


    Let me add that just as I type this it did the hissing noise for a few seconds. This time the furnace had been on for maybe 1 minute. I waited to see if it would shut off, but it didn't. Then a few minuets after this, it did it again for about 3 seconds. Then maybe 2 or 3 minuets after the second hiss it shut off.

    The reason I have been so persistent is because of the alarming rate of issues I am having with property management. We had about a 5MM gap in between the top and bottom window in our living room allowing wind and bugs in. It took a week to be "fixed" with weather stripping tape and duct tape on the inside and outside. Same for windows in our enclosed unfinished balcony/"storage area" that leaked "when the wind blows just right." One maintenance man has done a no call no show. We had no working smoke detectors in our unit, and I found that when I removed the upstairs smoke detector from the ceiling, I found a live exposed coper wire hanging loose. After the first maintenance man no called no showed, she claimed the second one had an "emergency" when he was scheduled to come out. And this one has me alarmed, we had a pizza delivered the other night. My girlfriend got the door for a change and the guy was telling us that he was almost our neighbor but found a ton of mold in the unit and the property manager claimed they would not do anything about it. Oh and the maintenance supervisor(?), went out of town, left no one capable of fulfilling his duties, and gave an estimated return date of late one week or early the next. If you have taken the time to read this slightly incoherent quick rant, you can understand why I am not taking the property manager's word that there is nothing wrong.

  2. #15
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,783
    It probably wasn't cold enough outside for the unit to run long enough to force a defrost mode the first few weeks you ran it. Buy a thermometer and track the temp, in heat pump mode it will be ~90F in heat pump with resistance on it will be ~100-115F and in defrost it will be ~75F (should only be this temp for a few minutes, around the time you hear the hissing noise) if it blows below the temp in your house at any point you have a problem.

  3. #16
    Join Date
    Nov 2012
    Posts
    9
    Quote Originally Posted by jtrammel View Post
    Buy a thermometer and track the temp,
    The temp of the heat pump? I think I am getting in over my head now..

  4. #17
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,783
    The temp of the air coming out of vents

  5. #18
    Join Date
    Nov 2012
    Posts
    9
    Ah ok. I can pick one up tonight on the way home.

    FYI, we got our electric bill today. It did jump ~$14 from last month, but I think this is in the realm of normal. I don't think this would have been the best month to judge though, because the temperature has fluctuated to much here in the Southern Indiana tip. A few days ago it was nearly 70*F(high), and today's high toped out just under 40*F so we have actually had to jump back and forth between our heat and AC, and some days we can just leave the heat/ac off with out even having to open a window.

    I think this coming bill, and a thermometer will be the real testament though. Technically the maintenance supervisor could have just picked up the dang phone and explained this to me, but I guess that is to much work. So thank you guys for all the help, and putting my mind at ease, well to some extent, on how this HVAC system works, and being able to provide real evidence to the property manager if the HVAC system is indeed malfunctioning.

  6. #19
    Join Date
    Nov 2012
    Posts
    9
    Been a few days and wanted to update this so I hope a double post is fine.

    Our maintenance man finally came out. He still did not actually look at the furnace, but did confirm that it was a heat pump model. He said the noise was the freon(or something) shooting out of the furnace to the AC unit next to the building, or something along that line. He also said it was normal for it to work really hard, and put out what seems like cold/cool air. Of course I guess you guys know all that already.

    Grabbed a <$1 thermometer from Walmart, popped out the vent in the living room, put it just under the register, then put the vent back on. I checked it a few times over the course of a few days and at random times. It was always reading at about 75*F. When I checked it, the air was not running but, I am unsure how long it had been running for previously, or how long it had been since the air had been running.

    It is still making the hissing noise all the time, and it is doing it in temps as warm as ~50*F outside.

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