Search Results - HVAC-Talk: Heating, Air & Refrigeration Discussion

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  1. Replies
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    981

    I can't do much more to increase ventilation....

    I can't do much more to increase ventilation. Right now I have a 6" outside air intake connected to the return plenum. The house itself is very leaky to begin with.



    Carrier PerfectAir. ...
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    8
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    981

    It's not affordable to replace a >$100 media...

    It's not affordable to replace a >$100 media filter cartridge every few days to prevent the HVAC system from smelling of cooking for 4h after dinner.


    Are there activated charcoal filters...
  3. Replies
    8
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    981

    Media filter odor load up

    Are there any good ways to prevent media filters from loading up with odors and re-releasing them after the original source is gone?

    I've got a media filter setup soaks up any ambient...
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    970

    Large room with good insulation and a mild...

    Large room with good insulation and a mild climate.

    The primary purpose is decoration (i.e. nice looking flames) rather than heating.

    Primary heat is via a heat pump.
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    970

    Very low output LP fireplaces?

    Are there any LP fireplaces on the market that have heat output ratings in the 2,000 BTU range? Modulating output from 1,500 to 8,000 would be ideal if possible. I've looked pretty extensively but...
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    443

    Ideally you should have return ducts, but if it's...

    Ideally you should have return ducts, but if it's not practical to have them installed, transfer grilles in the doors are a reasonable stopgap measure.
  7. Replies
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    570

    Terminology: it's "Manual J," not "Model J." ...

    Terminology: it's "Manual J," not "Model J."

    There's nothing you can do if the contractor lacks the basic trade skills to understand how to do his job. Call in a contractor from another area.
    ...
  8. What you want might not be possible. Evolution...

    What you want might not be possible. Evolution is very proprietary and doesn't get along well with third party equipment. Only certain versions of the Evolution UI allow external control over the...
  9. Replies
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    792

    The only benefit in going for electric backup...

    The only benefit in going for electric backup heat over gas is lower initial cost. If there's no cost difference, there's no reason not to go for gas.
  10. You'll need new wiring runs no matter which...

    You'll need new wiring runs no matter which option you chose.

    Has anyone done a load calculation for the attic? It's imperative that anything you have installed be sized appropriately to the heat...
  11. Boston's climate is too cold to use a heat pump...

    Boston's climate is too cold to use a heat pump as a sole heat source. If you go with the Fujitsu, you'll need a baseboard heater (or some other supplemental heat source) on a separate thermostat...
  12. Zoning won't work for a single room and a boost...

    Zoning won't work for a single room and a boost fan or enlarged vent won't help once the AC reaches set point in the rest of the house.

    You're basically stuck with either a minisplit or a...
  13. Replies
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    1,096

    My personal experience with a Carrier/Bryant's...

    My personal experience with a Carrier/Bryant's EAC is that it put out enough ozone to cause significant breathing difficulties. Maybe the unit I had was defective but I've not had anything to do with...
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    561

    First, why do you want to replace your Goodman...

    First, why do you want to replace your Goodman units? There's typically no need to replace equipment that's only a few years old unless it was badly over- or under-sized for the house. Do you have...
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    1,096

    As far as I know, there isn't any scientific...

    As far as I know, there isn't any scientific evidence that residential-grade filters help with asthma or allergies. The best you can hope to get is a filter that keeps your HVAC system clean.

    Get...
  16. Replies
    42
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    14,774

    Mitsubushi, Daikin, Sanyo, Fujitsu and LG are the...

    Mitsubushi, Daikin, Sanyo, Fujitsu and LG are the major players. LG is not known for quality.

    Mitsubishi single head minisplits heat down to 14 but only produce 60% of their nameplate heat output...
  17. Replies
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    2,818

    The motor control board in a VS blower system...

    The motor control board in a VS blower system contains a three phase inverter.
  18. Replies
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    2,818

    The whole point behind VS blowers is that they...

    The whole point behind VS blowers is that they have a lot more than three speeds.

    They have three coils because they're three phase motors.
  19. Hire a licensed professional engineer to evaluate...

    Hire a licensed professional engineer to evaluate your bids and do system design if necessary. In most markets it's a lost cause trying to get contractors to apply the ACCA Manuals (J, D, S & T) at...
  20. Replies
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    1,671

    If the behavior of the rest of the...

    If the behavior of the rest of the warranty/insurance industry is an indication, black boxing would save the industry millions by providing flimsy grounds to deny legitimate claims. Witness the habit...
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    1,454

    First, to quash an urban legend: asset stripping...

    First, to quash an urban legend: asset stripping in foreclosed houses has largely been done by mortgage servicing companies, not by the former owners. It's illegal--and several people have gone to...
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    3,628

    If you know your system's actual CFM output and...

    If you know your system's actual CFM output and heating + cooling capacity, figuring out target airflow is fairly easy.

    Airflow per room = room BTU / (system BTU / system total CFM).

    E.G.

    My...
  23. Replies
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    Ditch all your bids and call more contractors. ...

    Ditch all your bids and call more contractors. Tell them you want them to follow all ACCA design standards, specifically Manuals J, D, S and T.

    Read ACCA's consumer information before choosing a...
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    1,623

    Did any of these contractors do a Manual J load...

    Did any of these contractors do a Manual J load calculation? Throw out any bid that doesn't include a load calc.
  25. Replies
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    2,537

    If you're interested in zoning, then you might...

    If you're interested in zoning, then you might want to look at Daikin's VRV heat pumps. These things are much easier to zone than traditional forced air systems. Designing zoned forced air systems...
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