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  1. Replies
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    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. ...
  2. Replies
    8
    Views
    1,089

    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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    1,089

    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...
  4. Replies
    5
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    1,067

    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.
  5. Replies
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    1,067

    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...
  6. Replies
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    508

    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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    647

    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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    861

    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
    17
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    1,288

    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...
  14. Replies
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    623

    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...
  15. Replies
    17
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    1,288

    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
    Views
    16,991

    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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    3,207

    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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    3,207

    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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    1,923

    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...
  21. Replies
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    1,633

    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...
  22. Replies
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    4,213

    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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    1,810

    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...
  24. Replies
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    1,810

    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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    2,810

    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...
  26. Replies
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    807

    Installing a coil alone doesn't make much sense....

    Installing a coil alone doesn't make much sense. Indoor coils are compatible with a specific set of compressors, typically from one vendor. If you have a coil installed now, you will be locked in to...
  27. Replies
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    1,923

    Carrier architectured the system to require an...

    Carrier architectured the system to require an annual extortion ('subscription') fee from the end user. The centralized design adds no value for the end user but is extremely profitable for Carrier....
  28. Replies
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    1,176

    Spray foam is a struggle to deal with if you ever...

    Spray foam is a struggle to deal with if you ever decide to make changes to the space, such as adding more outlets, lights, or changing plumbing. It's an expensive proposition to hack the stuff out...
  29. Replies
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    3,819

    There should not be standing water in the drain...

    There should not be standing water in the drain pan. Get the installer to come back and fix the problem.
  30. Replies
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    2,091

    Yep. The act of having a service tech look at a...

    Yep. The act of having a service tech look at a system every 12 months scares the dust into dropping right off the AC coil. :p
  31. Replies
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    1,111

    Ductless air conditioners (Daikin, Mitsubisihi,...

    Ductless air conditioners (Daikin, Mitsubisihi, etc) or a high velocity system (Unico).
  32. Replies
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    1,176

    The minisplits will give you the most control as...

    The minisplits will give you the most control as you'll be able to set separate temperatures in each room. I'd be suspicious of the Carrier bid; 2 tons sounds massively oversized for two rooms built...
  33. Replies
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    1,340

    No cigar. Circulating air will not solve...

    No cigar.

    Circulating air will not solve inter-room temperature differences unless the ducting was nearly adequate to begin with. Circulation won't help with major temperature differences caused...
  34. Replies
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    3,764

    No. No. A correctly installed UV...

    No.



    No.



    A correctly installed UV light may prevent mold contamination of an AC or heat pump indoor coil. A anti-microbial treated coil will, however, have no contamination issues and...
  35. Old, multi story, houses are very hard to heat...

    Old, multi story, houses are very hard to heat and cool effectively. Doing the all the design math is essential.

    Did either bidder do a room-by-room Manual J load calculation? Manual D duct...
  36. Replies
    14
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    3,128

    Ventilation units with moisture recovery are...

    Ventilation units with moisture recovery are known as energy recovery ventilators (ERVs). ERVs bring in outside air while minimizing the effect of fresh air introduction on interior humidity. An...
  37. Replies
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    3,128

    HRVs provide ventilation. They don't change the...

    HRVs provide ventilation. They don't change the amount of absolute moisture is in the air. An HRV can change the relative humidity indoors but the effect will be identical to opening the windows. ...
  38. Replies
    14
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    3,128

    Opening the windows will have will have exactly...

    Opening the windows will have will have exactly the same effect on humidity as running an HRV.

    What you need is a dehumidifier.
  39. It may not be legal to use a privately owned...

    It may not be legal to use a privately owned submeter to bill a tenant for utility usage. Consult whichever authority regulates rental housing in your area.
  40. Replies
    9
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    898

    This will not happen with an Infinity system. ...

    This will not happen with an Infinity system. The controller shuts down the blower for five minutes after every cooling cycle to reduce re-evaporation.
  41. The unit will adjust airflow to meet heating and...

    The unit will adjust airflow to meet heating and cooling demands. The fan speed setting effects only air circulation when there is no heat or cool demand.



    Use the lowest setting that balances...
  42. Replies
    10
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    763

    Manual J is the cornerstone of any...

    Manual J is the cornerstone of any heating/cooling system design. If a contractor won't do the calculations, find a contractor who will. If no contractors in your area will do it, hire an engineer...
  43. Replies
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    420

    What you're asking for is impossible for an air...

    What you're asking for is impossible for an air source heat pump. Defrost is required by the laws of physics.
  44. Replies
    10
    Views
    763

    How bad do you winters get and what are your heat...

    How bad do you winters get and what are your heat loss numbers?

    Ductless heat pumps will work OK down to 17 or so. If your winters get worse than that then you could use a ductless heat pump and...
  45. Replies
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    1,368

    The brains of the Infinity system are in the...

    The brains of the Infinity system are in the thermostat. If you want to get the most out of an Infinity furnace and your AC (if any), you need to use the Infinity thermostat. Both the LCD backlight...
  46. Replies
    2
    Views
    430

    You need to do a room-by-room load calculation to...

    You need to do a room-by-room load calculation to figure out the heating and cooling loads for both rooms. Take these numbers and look through minisplit manufacturers' engineering data to see what...
  47. Replies
    7
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    530

    Radiant heating in a slab floor will give you...

    Radiant heating in a slab floor will give you trouble. Slab floors have so much thermal mass that they'll take hours--or days--to heat up and hours--or days--to cool down. Forget about night...
  48. Replies
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    1,314

    'Dry' mode is pretty much standard on all...

    'Dry' mode is pretty much standard on all minisplits, not just Fujitsu.

    Costs for minisplit heat pumps do vary from area to area. Here they cost about as much as premium conventional heat pumps...
  49. Replies
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    514

    Both Citi Multi S series and the Daikin...

    Both Citi Multi S series and the Daikin equivalent VRV-S series will run on single phase power. However, neither S or VRV-S can provide simultaneous heat and cool from the same outdoor unit. ...
  50. With any kind of indirect water heater, the water...

    With any kind of indirect water heater, the water heater is treated as another heating zone. The boiler will fire up whenever the water heater temperature falls below a set temperature. The system...
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