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

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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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    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...
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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...
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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...
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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...
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    462

    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...
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    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...
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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...
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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...
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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...
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