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  1. Replies
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    There are thermostats available that can control...

    There are thermostats available that can control multiple devices and stages with only two wires.

    I would want a two-stage furnace to operate as two-stages. Otherwise just get a single stage...
  2. The equipment is too big for the ducts and...

    The equipment is too big for the ducts and probably too big for the house. All your contractors were too lazy to determine what is right. They were only interested in selling you equipment.
    The...
  3. Replies
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    Your profile says you are the homeowner. Is this...

    Your profile says you are the homeowner. Is this something you are trying to remedy yourself?
  4. Bigger equipment is NOT an upgrade, it is an...

    Bigger equipment is NOT an upgrade, it is an UPSELL. Most duct systems are not big enough to begin with, so bigger equipment makes matters worse.

    Ask them to provide their Manual J load...
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    Have them prove their design with facts.

    Have them prove their design with facts.
  6. That is entirely wrong. Fix the ducts or size the...

    That is entirely wrong. Fix the ducts or size the equipment for the available air flow.
    Oversizing the equipment will result in poor performance, more frequent breakdowns, and shorter equipment...
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    Spot on. Actually an insulated roof is best. Or...

    Spot on.
    Actually an insulated roof is best. Or seal the house and ceiling. Then use natural ventilation.
  8. An indication the equipment is too big and the...

    An indication the equipment is too big and the ducts are too small. This is a common problem.
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    If I were you, I would get someone who actually...

    If I were you, I would get someone who actually knows what they’re doing.

    I would measure air flow and make corrections.
  10. “Working” and legally approved may be two...

    “Working” and legally approved may be two different things. Equipment that “ works” may not be covered for insurance or liability.
  11. Site rules do not allow us to give assistance for...

    Site rules do not allow us to give assistance for DIY.
  12. Replies
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    Sad but true.

    Sad but true.
  13. Replies
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    154

    Communicating thermostats make use of more...

    Communicating thermostats make use of more features of the equipment.

    You’re on your own when it comes to making wiring changes. Site rules prohibit giving advice for DIY.
  14. Replies
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    270

    Yup. Homeowner with a manifold. That won’t end...

    Yup. Homeowner with a manifold. That won’t end well.
  15. Replies
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    Some systems run the blower for a few minutes...

    Some systems run the blower for a few minutes after the cycle ends. Alternatively, there may be a loose duct which has air moving while the blower is off. Or, perhaps it is just the cold air...
  16. No. There are A LOT of things wrong with that...

    No.
    There are A LOT of things wrong with that installation. Ducts, drain, and venting are the obvious ones. Making it right won't be inexpensive. Ask for a technician who has been trained to do...
  17. No. Residential furnaces are not rated for mobile...

    No. Residential furnaces are not rated for mobile homes.
  18. Replies
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    i notice the curve intersects the 41* line twice....

    i notice the curve intersects the 41* line twice. Why is that?
  19. Replies
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    I have never seen a successful booster fan...

    I have never seen a successful booster fan installation.
    The majority of systems we see have oversized equipment and undersized ducts. A booster fan does not solve either of those problems.
    Long...
  20. Design for comfort and efficiency, energy savings...

    Design for comfort and efficiency, energy savings will result.
  21. That’s terrible duct work. Undersized, poorly...

    That’s terrible duct work. Undersized, poorly designed, and poorly installed.

    I recommend completely starting over. Begin with a load calculation. Then appropriate equipment sizing. Followed by a...
  22. Replies
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    The coil is not to be mounted before the furnace,...

    The coil is not to be mounted before the furnace, so the answer is NO.

    Is this a DIY project?
  23. Replies
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    I think we all have days like that. I certainly...

    I think we all have days like that. I certainly do. But I find when I complete all those little tasks, it makes my wife happy.
  24. Replies
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    It will be when he puts in a Nest.

    It will be when he puts in a Nest.
  25. Replies
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    Please note that this site does not provide...

    Please note that this site does not provide assitance for DIY.
  26. Replies
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    Either they provide insulation service or they...

    Either they provide insulation service or they partner with an insulator. I would be more concerned about how they chose the size for your equipment. Using the size of the old equipment is a lazy...
  27. Replies
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    We haven't needed backup heat here. I don't...

    We haven't needed backup heat here.

    I don't know if backup is a code requirement.
  28. Replies
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    You’ll be better off with a single stage system...

    You’ll be better off with a single stage system and a ducted dehumidifier which will operate during low load conditions.

    BTW, a load calculation is NOT X sq.ft. per ton. There is a link to a...
  29. Replies
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    Follow the installation instructions exactly. If...

    Follow the installation instructions exactly. If the contractor does not know why, then he’s not the guy you want doing the work.
  30. Replies
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    A load calculation will answer both of your...

    A load calculation will answer both of your questions about size.

    The brand is less important than the contractor. A poor installation will ruin good equipment. A good installation will make the...
  31. Replies
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    His projection of 150 PPM CO from a new furnace...

    His projection of 150 PPM CO from a new furnace is about 100 PPM too high. I often have furnaces with 30 PPM or less. He does not know enough for you to trust his advice.
  32. Given an average life of 17 years, it would be...

    Given an average life of 17 years, it would be foolish to keep he old coil.
    Performance will be much better with a fully matched system and there may even be rebates available for high efficiency...
  33. Replies
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    I’ll put on my shirt but I like to go Donald Duck.

    I’ll put on my shirt but I like to go Donald Duck.
  34. Replies
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    1,265

    I hadn’t heard that about zoom. We use it twice a...

    I hadn’t heard that about zoom. We use it twice a week for church as well as webinars. I’ll look into it.
    I would be interested in a get together when the contagion dies down. Have any locations...
  35. Replies
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    A system that meets code is bare minimum. Code is...

    A system that meets code is bare minimum. Code is a safety standard, not performance.
    It in no way guarantees a trouble free system with even comfort.
  36. Your description is not clear. Exhaust blower? Is...

    Your description is not clear. Exhaust blower? Is this an attic ventilator? Is it connected to the heating and cooling system? Your heating and cooling system should not be exhausting any air from...
  37. Replies
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    Site rules prohibit giving advice for DIY.

    Site rules prohibit giving advice for DIY.
  38. Replies
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    Make sure the ducts are well sealed. Use a MERV...

    Make sure the ducts are well sealed. Use a MERV 13 or better air filter ONLY after determining the duct system is big enough to accommodate the added pressure drop of a good filter. ONLY AFTER!
    ...
  39. A licensed contractor but not HVAC. That’s like...

    A licensed contractor but not HVAC. That’s like having an optometrist do your heart transplant. After all, they’re both doctors.

    I get tired of HVAC getting little respect.
  40. Thread: Dust help

    by kdean1
    Replies
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    399

    How about a blower door test to find out about...

    How about a blower door test to find out about envelope leakage?
  41. Replies
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    Simple. Just record the U-value of all the...

    Simple. Just record the U-value of all the exterior surfaces of the house and the area of those surfaces. Enter them into your Manual-J software (it used to be a lengthy handwritten process) and...
  42. Replies
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    Thanks SO MUCH for your insightfully bringing...

    Thanks SO MUCH for your insightfully bringing back a thread that died years ago. :gah:
  43. Replies
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    4" pipe won't deliver any appreciable air flow....

    4" pipe won't deliver any appreciable air flow. Any elbows will reduce it still more.

    You cannot know what size ducts or how many are needed unless you know how much air flow is needed to the...
  44. Replies
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    Instead of guessing, have a technician measure...

    Instead of guessing, have a technician measure and test the components. Then just replace what's not working properly.

    Site rules do not permit us to give advice for DIY efforts.
  45. JB Weld

    JB Weld
  46. I was thinking of Super Glue. :grin2:

    I was thinking of Super Glue. :grin2:
  47. A technician would be able to make it happen...

    A technician would be able to make it happen correctly.
  48. Sure looks like it. Stay tuned for an account...

    Sure looks like it.

    Stay tuned for an account of a spectacular disaster.
  49. Replies
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    No chance of success with 4” ducts. No chance of...

    No chance of success with 4” ducts. No chance of success without a duct design, known as manual D. No chance of success by guessing.
  50. Nest thermostat?

    Nest thermostat?
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