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  1. Replies
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    You're not allowed to drain condensate into the...

    You're not allowed to drain condensate into the sanitary sewer? Then again, I'm from a northern climate. i guess down there, that would be normal. I remember seeing plumbing run on the outside of...
  2. As mentioned in other posts... this is likely a...

    As mentioned in other posts... this is likely a major source of the problem. The other could be the airflow setting is too high. An improperly charged unit could also be a issue as well.

    Also...
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    +1. A 1.5 ton should have been plenty on the 1st...

    +1. A 1.5 ton should have been plenty on the 1st floor as well. 2 story homes have "Reverse stack effect". So hot humid air in summer leaks in upstairs and drives already conditioned air downstairs....
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    I'd put in dual fuel downstairs and heat pump...

    I'd put in dual fuel downstairs and heat pump upstairs.

    FYI - Georgia isn't that hot, mostly humid. Its' just as hot here in Iowa, just for not as long. Georgia just doesn't have a winter...
  5. All 2 story homes in climates with 4 seasons...

    All 2 story homes in climates with 4 seasons should have zoning.

    Another grat way ot zone a home for heating is to use radiant floor heat. Sicne your a minimal cooling, heating dominate climate...
  6. I'd look at steel shingles or metal roofing. ...

    I'd look at steel shingles or metal roofing.

    Your goal should be to get down to two 2 ton systems, or even better a single 3 ton zoned system. Very possible in a spray foamed house if you can...
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    You're probably borderline. Low stage on a 4 ton...

    You're probably borderline. Low stage on a 4 ton is about 3.2 tons. So a 3 ton set to 450CFM/ton for your dry climate might have matched a 4 ton set to 400CFM/ton.

    With stucco homes, the...
  8. 400 sqft shouldn't have added 1 ton of additonal...

    400 sqft shouldn't have added 1 ton of additonal load. 0.5 tons at most and that's assuming the existing system wasn't already oversized.

    With zoning you should in most cases have 2 stage...
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    +1. Gabl vents will short circuit some of the...

    +1. Gabl vents will short circuit some of the airflow and reduce the effectiveness of the ridge and soffit vents.
  10. It's spray foam and very large home. The latent...

    It's spray foam and very large home. The latent load seems very low... even using and ERV. Having a smaller heat gain upstairs is suprising, even with excellent attic insulation.


    That beign...
  11. Replies
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    1,689

    Sorry, I was confusing attic ventilation fans,...

    Sorry, I was confusing attic ventilation fans, with Whole House attic fans. Typically whole house units draw from a central return. I don;t see how it woudl work well to draw form the HVAC system...
  12. Replies
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    With all 10 items listed, there were those...

    With all 10 items listed, there were those abusing the lack of rules or oversight.

    You forgot to mention the lack of safety equipment in passenger vehicles.

    Pretty dramatic shift in...
  13. Replies
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    Do a search for dampers. You can do just a...

    Do a search for dampers. You can do just a simple "non voting" zone system. Where the dampers close if it gets too cool, but they cannot initiate a call for cooling or heating.
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    These attic bonus rooms usually have cathedral...

    These attic bonus rooms usually have cathedral ceilings, so far less insulation. Conventional composite shingle roofs and insulation methods mean these rooms get BAKED in hte summer. I recently...
  15. Replies
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    +1. Too many cost cutting measures. Adjusted...

    +1. Too many cost cutting measures. Adjusted for copper prices, inflation, and the increased size of coils, I think those AC units that lasted 40 years would cost almost 2X if you built them today...
  16. Replies
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    74 is pretty cool indoors for Houston if you're...

    74 is pretty cool indoors for Houston if you're managing the humidity. 75F is more typical.

    I was also suprised to find that desing temps are lower than I thought. Houston AP is 31F Winter and...
  17. Replies
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    554

    At your design temp, your capacity is lower than...

    At your design temp, your capacity is lower than nominal. So a 3.5 ton would be in order. With only 1800sqft, that's not enough thermal mass to cut it close IMO. If it was 2500sqft, or a old home...
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    I think they are illegal in some locations...

    I think they are illegal in some locations because it's becomming more widely recognized that they cause more harm than good in most situations. IF you have any ceiling penetrations that are not...
  19. Open the ceiling. Best not to finish basement...

    Open the ceiling. Best not to finish basement ceilings anyway for that reason.

    I had mine outside the bedroom wall what's pour need read on our last house. I world do that again. That's...
  20. If you have a 80% furance, you might consider...

    If you have a 80% furance, you might consider dual fuel and install a heat pump in your moderate climate if you electric rates are lower.

    I have 2 Carrier sytems in my home. They are new, so I...
  21. Replies
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    In a 2 story home in a humid but otherwise...

    In a 2 story home in a humid but otherwise moderate climate like yours (winter are summers are not extremely hot or cold) I would defintiely go 2 stage. Dual fuel, if you have natural gas is also a...
  22. No, Rumor has it they are closing Gitmo and...

    No, Rumor has it they are closing Gitmo and opening new facilites in former crack houses there. No guards needed. Just tattoo I hate "n" on them and they won't be able to leave the building...
  23. Replies
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    In a humid climate, go with a full infinity...

    In a humid climate, go with a full infinity system. Tn6 furnace and ana7 outdoor unit. Do not oversize. Consider zoning or adding it later with a 2 story home. Even consider slightly...
  24. Replies
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    If you can get the temps even enough for comfort...

    If you can get the temps even enough for comfort and they are single stage units, (5tons usually are) then longer run times will increase efficiency, reduce equipment wear and reduce humidity. 3...
  25. Also consider a possible change in wet bulb temp...

    Also consider a possible change in wet bulb temp (depending on location) and increase in reverse stack effect driving infiltration in a 2 story home (if applicable).



    Sent from my SGPT12...
  26. Thread: 51st State

    by motoguy128
    Replies
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    631

    Why not just let Nebraska annex them. Should be...

    Why not just let Nebraska annex them. Should be plenty right learning for them there. The southeast counties can join Kansas.



    Sent from my SGPT12 using Tapatalk 2
  27. That's crap. Sorry. uyt if 3 tons was jsut...

    That's crap. Sorry. uyt if 3 tons was jsut slightly big, then you wouldnt't have humidity issues. 2.5 tons was likely plenty, except that many homeowners complain if their system won't cool down a...
  28. Replies
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    In a 2200sqft house, you'll never motice the...

    In a 2200sqft house, you'll never motice the 2000BTU's you are short. Heck, a toaster oven or coffee maker can put out that much heat. If your furnace is 2k BTU's short it would take hours to lose...
  29. Replies
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    a 3.5 ton indoor coil gives a higher effciency...

    a 3.5 ton indoor coil gives a higher effciency match when paired with a 3 ton condenser. The furnace, coil and condenser all get matched and have a rated effceincy as a set. This information is...
  30. Replies
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    If a Manual J said 59... then put in a 60k. The...

    If a Manual J said 59... then put in a 60k. The modulating 98% infinity unit is very, very nice option if your in a cold climate.

    With a 2 story home, for more even tempratures and comfort, you...
  31. Infinity is an awesome system. 2 in my home. ...

    Infinity is an awesome system. 2 in my home. THe touch control in terms of features and equipment performance may be a worhwhile upgrade. The standard controller adjusts airflow in steps. The...
  32. Replies
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    I wouldn't ever worry about mold in a vented...

    I wouldn't ever worry about mold in a vented attic. Too hot. Maybe a vented attic with a cool roof. That's why when you have a cool roof design, you're best to just seal the attic, use a vapor...
  33. I think you can add a outdoor sensro to that...

    I think you can add a outdoor sensro to that model, but it's only 3 heat stages and 2 cool. So it would have to use your furnaces default staging timer. For dual fuel, the best non-communicating...
  34. Heck, in that case, I think those temps are...

    Heck, in that case, I think those temps are almost design conditions, and a 1.5 ton is stil probably a little oversized there. Remember, when you change the temp of a home, in addition to offsetting...
  35. How quickly do you expect it to cool off the...

    How quickly do you expect it to cool off the home? Why do you expect that? Most peopel don't realize that long run times make units more effceint, make a home more comfortable and EXTEND equipment...
  36. If you like the Carrier contractor, I'd...

    If you like the Carrier contractor, I'd definitely go with the modulating MN7 furance. Insanely quiet and nice even heating. Id' make sure a good, accurate load calculation is performed using the...
  37. I'd just get an electric tank. Electric on...

    I'd just get an electric tank. Electric on demand IMO is only practical for POU units for hand wash sinks. In that use, you only need a single cold water supply and you get instand hot water. I'd...
  38. Depending on pipe length, location and other...

    Depending on pipe length, location and other facotrs, it's even possible that wiht the pump off you can have a significant convective current. A check valve is working properly should prevent that. ...
  39. I don't see why it wouldn't. However, the...

    I don't see why it wouldn't. However, the airflow needs for zoning will likely superceed the dehumidification airflows until you're all zones are calling. Meaning that most of the time, it may...
  40. Thread: Humidity

    by motoguy128
    Replies
    36
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    2,244

    You don't nessearily want to feed the air handler...

    You don't nessearily want to feed the air handler dryer air, it will reduce it's efficiency. You AC unit is more efficeint than a portable dehumidifier at what moisture it does remove.
    I'd place...
  41. How good is "free" if you aren't comfortable and...

    How good is "free" if you aren't comfortable and paying for higher cooling bills. If they do a poor job fixing or servicing it, what happens when the warranty is out. Seems like a lot of poor...
  42. Thread: Humidity

    by motoguy128
    Replies
    36
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    2,244

    That's a pretty large unit for such a small...

    That's a pretty large unit for such a small space. 2 or even 1.5 tons is probably plenty, especially if there are shared walls. Florida is more humid than hot, so equipment is frequently oversized...
  43. Replies
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    I don't think it ever gets 95F and 90% humidity...

    I don't think it ever gets 95F and 90% humidity anywhere in the world, 105F and 90% RH defintiely doesn't exist without lots of steam leaking from an industrial process.. except inside industrial...
  44. Replies
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    Always good to sacrifice comfort and system...

    Always good to sacrifice comfort and system performance so it's integrates with a home automation system. Some of those HIS are less sophisticated and intellgent than the better HVAC controller. I...
  45. Depends on how long the run times are. I...

    Depends on how long the run times are.

    I jsut looked up NC. In Raleigh for example, design temp is only 90F. Yes, only 90F. That's 2F lower than where I am in Iowa with only slightly more...
  46. Pretty common to oversize the coil a 1/2 ton for...

    Pretty common to oversize the coil a 1/2 ton for higher effciency. 3 tons is probably bigger than you need depending on construction and shading. But shouldn't be grossly oversized. The larger...
  47. Replies
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    Keep in mind Manual J has some built in safety...

    Keep in mind Manual J has some built in safety margin. It also doens't take thermal mass into account. Objects and building materials that make up a home store heat. Homes with stone or brick...
  48. I'd go with the 2 stage AC over the single stage...

    I'd go with the 2 stage AC over the single stage heat pump since you have longer cooling seasons and fairly humid weather. Best would be paying a little extra for a 2 stage heat pump and get long...
  49. Replies
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    Michigan is actually relatively mild in winter...

    Michigan is actually relatively mild in winter and especially summer. The unit is going ot be oversized or cooling. Probably by about 2X so it will short cycle in summer, especially a dignle stage...
  50. Also post the model numbers of the indoor and...

    Also post the model numbers of the indoor and outdoor unit.

    Also, is this unit located in an attic? or have returns in the wall cavities? Ductwork sealed? You sure?

    Of course taking the wet...
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