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  1. #40
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,918
    I like his article "Latent Heat is the Wicked Witch of the South" this is why in Houston we have such long run times. I get this a lot, especially from folks in older homes, Bill my a/c seems to run all the time, well Mr. Jones, when your feeding your a/c with latent heat all day long through cracks in walls, doors an etc. your need to starve that a/c by sealing up your home first. Or as Mr. Bear would tell them, get yourself a whole house dehumidifier, which I personally think is the best bang for your buck in our climate, or just add one to your new system.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  2. #41
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,341
    Quote Originally Posted by Mr Bill View Post
    I like his article "Latent Heat is the Wicked Witch of the South" this is why in Houston we have such long run times. I get this a lot, especially from folks in older homes, Bill my a/c seems to run all the time, well Mr. Jones, when your feeding your a/c with latent heat all day long through cracks in walls, doors an etc. your need to starve that a/c by sealing up your home first. Or as Mr. Bear would tell them, get yourself a whole house dehumidifier, which I personally think is the best bang for your buck in our climate, or just add one to your new system.
    A small point of difference. Homes need an air change of fresh air in 4-5 hours when occupied. Occupants add moisture to the home. When the outdoor dew point is 60-70^F, but the sensible temperature is 65-75^F, the a/c does not have significant sensible cooling load while still getting the 3,000-4,000 btus of latent load.
    If home really got the needed fresh air during low cooling loads and high dew points, they will be damp. Unless they have reheat or supplemental dehumidification.
    Ultimately, fresh air ventilation when occupied and supplemental dehumidification are needed for indoor air quality and comfort in a modern home.
    A simple medium SEER a/c and a ventilating whole house dehumidifier are a practical method of getting the best of all worlds of IAQ, Comfort, Effeicency, and Reasonable Investment.
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  3. #42
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,918
    Quote Originally Posted by teddy bear View Post
    A simple medium SEER a/c and a ventilating whole house dehumidifier are a practical method of getting the best of all worlds of IAQ, Comfort, Effeicency, and Reasonable Investment.
    Going even a little deeper here, if the mfg. would incorporate a dehumidifier into the furnace or AH from the get go, the customer would get the best of both worlds in their purchase. Of course they may not be able to sell many of those high dollar, high seer systems either, and I am sure they would make more $$$$ off the high seer systems, rather than an integrated dehumidifier system. If I could build and develop one of these systems in Houston, I would be a trillionaire.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  4. #43
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,321
    For the type of home Bear is building a SDHV system with manual N load calc utilizing a Unichiller with Hydronic heat and cool staged and zoned he will have near perfect comfort with low utility bills including DHW. Considering the high west load a staged zoned system would be perfect.

    I really do not know of another company that does this in Houston but I am sure UNICO could make a recommendation.

    I would love to do a home like this but I am enjoying being retired from the BIZ and there is not enough money to drag me back.

    And yes supplemental dehumidification would be very beneficial in a home of this type. Bear stay away from an ERV in Houston they are not worth the expense especially since it is not that much more for a qualty unit from UltraAire.

  5. #44
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    It actually could be easy to do. Just take a residential water source unit and add a split condenser then make the piping changes and add the 2nd coil for hot gas reheat. Then maybe add the option of and integrated erv and our economizer


    Sent from my DROID RAZR using Tapatalk 2

  6. #45
    Quote Originally Posted by teddy bear View Post
    A simple medium SEER a/c and a ventilating whole house dehumidifier are a practical method of getting the best of all worlds of IAQ, Comfort, Effeicency, and Reasonable Investment.
    If I never get away from needing the dedicated dehumidifier with the more advanced variable drive gear, then this starts to sound like the right way to go -- at least as a starting point. The sweet spot in the market right now is in the 15 - 17 SEER range?

    Quote Originally Posted by classical View Post
    For the type of home Bear is building a SDHV system with manual N load calc utilizing a Unichiller with Hydronic heat and cool staged and zoned he will have near perfect comfort with low utility bills including DHW. Considering the high west load a staged zoned system would be perfect.

    I really do not know of another company that does this in Houston but I am sure UNICO could make a recommendation.
    The website pushed me to someone in Dallas, but I'll see if they recommend anyone local.

    Setting aside some of the pure performance aspects, it also seems like every US-based manufacturer has a proprietary communication format for their more advanced product lines (e.g., iComfort from Lennox). Can a Nest or other advanced third-party t-state use the full capability of a Greenspeed or XP25/XC25? I am a little bit of a gadget hound, but I mostly don't want to get out of bed to change the thermostat. The rest of the bells and whistles are toys.

  7. #46
    Quote Originally Posted by motoguy128 View Post
    It actually could be easy to do. Just take a residential water source unit and add a split condenser then make the piping changes and add the 2nd coil for hot gas reheat. Then maybe add the option of and integrated erv and our economizer


    Sent from my DROID RAZR using Tapatalk 2
    Thanks! I think I follow, though my understanding was that water-based cooling was for high capacity commercial use. I am hoping for a peak heat load in the 3 - 5 ton range and our lot is a small, inner city lot.

  8. #47
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,321
    The nest will not provide full function with communicating equipment.

  9. #48
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,918
    Quote Originally Posted by classical View Post
    The nest will not provide full function with communicating equipment.
    Your right! the Nest is nothing but a conventional stat on steroids, that "supposedly" saves you money, because it has a built in setback that you have no control over. O lets not forget it's most positive feature, the wifi ability to adjust stat away from home with your smartphone device, well you can get a good mid range Honeywell with wifi capability, that has more "useable" features, but not quite as pretty.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  10. #49
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Nest is just a clock programmable thermostat with internet access, a motion sensor and logic that prioritizes energy savings over comfort. It provides little benefit if any if you have properly sized equipment. It's a lot less capable than most of the communicating systems, espescially those like Carrier Infinity that manage airflow precisely to maintain humidty levels.

    Controlling humidity, is the key to maintain comfort in any humid climate. You happen to like in one of the humidity capitals of the country.

  11. #50
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Tell you what... just blue print my home, move some walls around so you can have a more ecclectic, inefficient, hodgepodged modern layout, spray foam the wall cavities use a cool roof, drop the window area to a more reasonable amount to keep your constrution costs in control, and I'll guarantee you can cool the whole place with 2 tons... and it won;t matter when thermsotat or equipment you use, since it will be cool, dry and even temps all the time. It was designed almost 90 years years ago by someone that I think was a lot smarter and mroe expereinced than those designing houses now. It was built at a time when AC didn;t exist in residential homes, so it built in features to cool a home naturally. Why reinvent the wheel.

  12. #51
    Join Date
    May 2002
    Location
    Houston Texas
    Posts
    6,321
    Bear call and talk to Dr. Heat Professor Cool in League City or Contact Jason from this site. Now that I am retired they will be your best bet for a proper design and install. I do not know of anyone in Houston that does quality work that does Unico.

    I seriously doubt you will need 2-tons total cooling for this house.

    Best option but expensive UNICO with Unichiller w/dehumidifier, next best Infinity/Greenspeed or comparable Lennox product w/dehumidifier. The only reason I recommend a 2-stage system is because of your peak load with west wall fenestration.

    Zoning is also recommended and the Lennox and Carrier equipment have the best zone products.

  13. #52
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,918
    Al, his biggest issue in Houston, is going to be someone that is willing to take on the responsibility, of guaranteeing the outcome of his expectations. Probably have better luck in the off season, finding someone that is willing to spend some time on his project. Problem is with any a/c sale, it's impossible to know exactly what the homeowner expects, especially on a new build, because you have nothing like an existing ac system to compare it to. Is he going to be the GC on the job? If not he will have to tell the builder he will handle the ac part, most GC's don't like that, and are not very corporative with the ac contractor on the job, been there done that before. Al, even if your retired, this would be a good pocket change job you could supervise, unless your just spending all your time and money traveling the world. I thought about at least simi-retiring, but I don't travel much, I am pretty much a home body, retiring would turn me into a recluse.


    Sent from my iPhone using Tapatalk
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

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