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  1. X2 ^^^^ Sounds like a water source heat...

    X2 ^^^^

    Sounds like a water source heat pump, and if so I'd want to know what temps the building loop runs at as part of my compressor failure investigation.
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    3.5 tons for 1,500 square feet in Texas? If it is...

    3.5 tons for 1,500 square feet in Texas? If it is the typical Texas install quality, it is the installation that is likely sucking delivered capacity away from your system. Duct leakage, already...
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    I can't see how the refrigerant "checked as full"...

    I can't see how the refrigerant "checked as full" if you can't get the house down to 76 when outdoor temp is at 80. Without more data we can't expand much on what you've given us. I'd get a second...
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    The only way to be definitive about this is to...

    The only way to be definitive about this is to have a sharp technician measure the total external static pressure (TESP) of your furnace, and compare it to what the manufacturer recommends the...
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    If you have an ECM motor on the furnace, high...

    If you have an ECM motor on the furnace, high duct static pressure can contribute to premature ECM motor failure.

    If you have a PSC motor on the furnace (has a capacitor), and it hasn't failed...
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    I strongly advise against ANY type of scent added...

    I strongly advise against ANY type of scent added to air. We are just beginning to understand how scents, perfumes, etc. react with ozone and other components to form nasty things in the air, like...
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    As Teddy Bear and others have mentioned, the...

    As Teddy Bear and others have mentioned, the interior of an air handler, downstream of the cooling coil, is a very cool, humid location ideal for mold growth.

    If you increased your filter MERV...
  8. I'd want some diagnostics done on the HVAC...

    I'd want some diagnostics done on the HVAC installation concurrent with building envelope improvements (good for you the latter is on your radar screen). Specifically, if you have duct leakage, which...
  9. An insulated and floored attic is no guarantee it...

    An insulated and floored attic is no guarantee it is not exchanging air between it and the house. That said, your original complaint leading to the removal of your furnace was headaches that appeared...
  10. I maintain that you have a moisture problem with...

    I maintain that you have a moisture problem with your house, caused by the house, not exactly or solely by the mini split units. CraziFuzzy is saying the same thing: mini splits work fine on other...
  11. Your basement strikes me as a large contributor...

    Your basement strikes me as a large contributor to your house humidity problem, and that remains even with your disclosure that you're attempting to seal off openings to the basement from the house....
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    If you're going with Greenspeed or Infinity, you...

    If you're going with Greenspeed or Infinity, you want the best duct system your money can buy. I also recommend keeping equipment and ductwork out of the attic, if at all possible. You'll pay more...
  13. Sounds like it was a control issue, then, with...

    Sounds like it was a control issue, then, with the bad diode being the culprit.
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    Two exterior walls on the cold basement room with...

    Two exterior walls on the cold basement room with a drop ceiling: I'd want to look above the drop ceiling to see if the rim joist of the house is insulated. That is the area where all of the floor...
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    BaldLoonie elaborated on a general point I wanted...

    BaldLoonie elaborated on a general point I wanted to make: not many folks understand and know how to design residential zoning systems correctly, or if designed well the challenge is then finding...
  16. I would call Fieldpiece tech support with your...

    I would call Fieldpiece tech support with your problem.
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    ^ ^ ^ This. Well said.

    ^ ^ ^ This. Well said.
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    Just going by memory, but the formula I remember...

    Just going by memory, but the formula I remember is:

    Sensible Room Load/1.08 x (Room temp - Supply air temp)

    So, in the OP's case this would be 3000 BTUH sensible gain/1.08 x (75-55) = 139 CFM
  19. Yup. Building depressurization scenario remains...

    Yup. Building depressurization scenario remains in spite of fresh pookie in thermostat wire hole. Improved comfort levels in home delivered at expense of long run times, masking the all too common...
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    If your coil is getting dirty quickly in between...

    If your coil is getting dirty quickly in between cleanings, I would want to look at possible return duct leakage and better filtration, such as deep media pleated filters with minimal bypass issues....
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    Someone needs to check amp draw on the low...

    Someone needs to check amp draw on the low voltage side of this system when it is running. Of course, now that the contactor was replaced, if the fuse never blows again then it's a safe bet OP solved...
  22. Is this a two-stage a/c system? Otherwise I'm...

    Is this a two-stage a/c system?

    Otherwise I'm thinking building pressurization/depressurization scenarios combined with leaking ducts on both supply and return side.
  23. Well, the best I could decipher from your...

    Well, the best I could decipher from your paragraph above is that you have a musty smell, you're concerned about fried wires for some reason, and you're also concerned about system run time.

    What...
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    Okay, got it. Just thought I'd put it out there...

    Okay, got it. Just thought I'd put it out there in case you were using a severe setback.

    If I lived in Phoenix I would absolutely without question have a heat reflecting roof on my house, because...
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    Darrel is correct (as he so often is). All of...

    Darrel is correct (as he so often is). All of these things are true, and required if you want the evaporator coil to be as efficient at heat transfer as it can be when the structure it is cooling...
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