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  1. Replies
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    Here is a definitive article about velocity by...

    Here is a definitive article about velocity by Allison Bailes from his energyvanguard.com blog posts.
    https://www.energyvanguard.com/blog/best-velocity-moving-air-through-ducts
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    As you have found, a good decision on a heating...

    As you have found, a good decision on a heating system should involve plenty of diagnosis and planning rather than a decision under pressure.
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    How can the humidifier add humidity to the air if...

    How can the humidifier add humidity to the air if no air can get to it? :gah:

    Additionally, it should only operate when the furnace blower is on. Things aren't looking good at this point.
  4. I agree with your procedure if you are willing to...

    I agree with your procedure if you are willing to spend a lot of time and money without any assurance of fixing it.

    I disagree if you want it resolved correctly and want it operate as efficiently...
  5. You should insist that the installers perform a...

    You should insist that the installers perform a combustion analysis to properly commission the furnace. Just waving a CO sensor around does not assure correct adjustment. Neither does "nice blue...
  6. The problem with changing temperatures is that...

    The problem with changing temperatures is that although the air temperature is brought back to the occupied setting, the surfaces in the house take hours to return to the daytime temperature. The...
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    We bought a used one a couple of years ago. We...

    We bought a used one a couple of years ago. We have only used it a couple of times. It makes great cuts.
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    It may be that you didn't configure it correctly...

    It may be that you didn't configure it correctly after the installation.
  9. Honeywell Prestige IAQ can control 3 stages of...

    Honeywell Prestige IAQ can control 3 stages of heat, 2 stages of cooling, dehumidifier, humidifier, and ventilator, all with just two wires to the thermostat location. It is also user friendly.
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    Or any measurements

    Or any measurements
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    A combustion analysis will provide a lot of...

    A combustion analysis will provide a lot of useful information. If youíve been in the trade 15 years and havenít taken the training, I strongly recommend you take the NCI class. It is an eye opener.
  12. The installation manual covers all the settings....

    The installation manual covers all the settings. I’m not familiar with the T10. We use the Prestige for high end dual fuel systems and an Aprilaire t’stat with an outdoor sensor for basic dual fuel....
  13. I have used dye on split systems depending on the...

    I have used dye on split systems depending on the situation. Mitsubishi does not approve use of dye so I have never used it in them.
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    Start with a blower door test to measure and...

    Start with a blower door test to measure and identify the leaks in the house. Then make reasonable improvements to tighten the house. That does NOT mean piling on more insulation and replacing...
  15. UV is indeed effective in commercial HVAC...

    UV is indeed effective in commercial HVAC applications, as well such things as sterilizing medical instruments. My objection is to the implication that if it works in those instances that it will...
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    I get the impression you're watching videos on...

    I get the impression you're watching videos on how to fix your furnace. Your description is of something far worse than something that needs cleaning or a new part. This site does not provide DIY...
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    The furnace does not come "pre-adjusted" for your...

    The furnace does not come "pre-adjusted" for your house and duct system, so YES, this could be related.
  18. Replies
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    Insulation is NOT air sealing. Air sealing should...

    Insulation is NOT air sealing. Air sealing should be performed prior to insulation. In your house it was not.
  19. Replies
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    Yes, it is that bad. Framing is not air tight and...

    Yes, it is that bad. Framing is not air tight and fiberglass is not air tight either.
    The use of building cavities as returns has been around for a long time as a cheap method of routing return...
  20. I don't know if your Goodman furnace needs their...

    I don't know if your Goodman furnace needs their proprietary Comfortbridge controller. Your contractor should know the appropriate thermostat. Most high end equipment makes use of all the features...
  21. That's where inverter equipment comes in by...

    That's where inverter equipment comes in by virtue of load matching. It uses built in algorithms. Most people don't want to enter lots of parameters to control their system. They just want to be...
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    Normal behavior

    Normal behavior
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    The manuals should have been left by the...

    The manuals should have been left by the installing contractor. If they can’t be found, check online.
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    Forget finding a manual and forget error codes....

    Forget finding a manual and forget error codes. They aren’t for the homeowner.

    Electric furnaces aren’t very complicated compared to high efficiency gas furnaces. A good technician should be able...
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    X3

    X3
  26. Look into an inverter sytem, ducted or ductless....

    Look into an inverter sytem, ducted or ductless. The beauty of it is Load Matching.
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    The Navac battery flaring tools are fantastic.

    The Navac battery flaring tools are fantastic.
  28. Dump the home warranty. Is is NOT an insurance...

    Dump the home warranty. Is is NOT an insurance company, as many victims think. Hire a good contractor to look things over.
  29. That’s a lot of duct work for a Mitsubishi. What...

    That’s a lot of duct work for a Mitsubishi. What static pressure did your designer use? From what I understand the Mitsubishi ducted units are only capable of about .2” WC.
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    What you are asking falls into the DIY category....

    What you are asking falls into the DIY category. Site rules prohibit giving such advice.
    This is something your on site technician can address.
  31. Installers are NOT designers. Be prepared for...

    Installers are NOT designers. Be prepared for uneven delivery and temperatures.
  32. First, I hate Nest. It causes weird and...

    First, I hate Nest. It causes weird and intermittent problems. Replace it no matter what else is wrong with the system.

    You have not posted any useful information about the performance of the heat...
  33. Hire a company with experience in duct design. ...

    Hire a company with experience in duct design.
    Do have your house examined to see how it can be tightened for more energy efficiency. A blower door test can be very helpful for this.
    Also...
  34. Residential UV lights are worthless and potentially hazardous - Change my mind

    From what I've read and heard on podcasts, residential UV lights do not kill CV-19. I have seen them degrade air filters and the casing on wiring. I have concerns about ozone production even though...
  35. Honeywell Prestige IAQ gets my vote too. If...

    Honeywell Prestige IAQ gets my vote too.
    If you'll tell us what you want to configure we may recommend something different.
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    New furnace. It will be impossible to completely...

    New furnace. It will be impossible to completely clean the old one.
  37. Proper temperature rise can be set with a...

    Proper temperature rise can be set with a combustion analyzer by a trained tech.
  38. Or both.

    Or both.
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    Poll: From what I’ve read, ozone is bad for humans and...

    From what I’ve read, ozone is bad for humans and houses.
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    Poll: I find it amusing that a homeowner claims to have...

    I find it amusing that a homeowner claims to have learned more from “The Internet” about IAQ and dehumidification in a few weeks or months than Teddy Bear. :gah:
  41. It sounds like your salesman over promised.

    It sounds like your salesman over promised.
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    Mud is already saturated and won’t hold much more...

    Mud is already saturated and won’t hold much more water. An air conditioner can generate 30 gallons of water in a day when under high load conditions and you have 30 of them! You will soon have a...
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    I expect the rusting of the rest of the duct...

    I expect the rusting of the rest of the duct isn’t far behind. I suggest you consider alternatives, such as ductless.
  44. I recommend ductless. Probably more than one...

    I recommend ductless. Probably more than one multi-zone system. That way you’ll have redundancy if one unit has a problem.

    Think about the temperatures in the attic during the summer and the...
  45. The compressor has to pump the full volume of...

    The compressor has to pump the full volume of refrigerant when it runs. If only the 7k Btu head is heating, the other heads have to have flow even though the fan has been turned down.
    There are...
  46. Hard water or soft? Our locale has hard water and...

    Hard water or soft? Our locale has hard water and the pad is loaded with mineral deposits after two years. I recommend annual replacement to keep it working.
    Hard water is a reason I suggest an...
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    Our distributor tech rep for ICP is a great guy....

    Our distributor tech rep for ICP is a great guy. He doesn't try to blame equipment problems on the installation. If he doesn't have the answer right off the bat, he admits it, researches it, and then...
  48. This is not new. Not even our installation. Our...

    This is not new. Not even our installation. Our price was too high so the owner of the bar had 4 units installed by one of the local hacks who has since died.
    4-4 ton units crammed on a rack on the...
  49. We'll have a much better idea of what you're...

    We'll have a much better idea of what you're dealing with if you provide the brand, model, and serial numbers.

    I'm accustomed to using the term air handler for standard split systems, so I find...
  50. What ultrasonic leak detector under $800 do you like best?

    We're trying to find a leak on a Mitsubishi MXZ-8B48NA.
    We've been trying to locate it for weeks.
    We had pressurized the entire system to around 400 PSI and isolated the heat pump from the...
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