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  1. Another way of moisture removal (instead of...

    Another way of moisture removal (instead of reheating with gas or hot water) is to install heatpipes and use them for reheat. These require no additional energy use.
  2. http://optimalbuilding.com/files/ele...n_the_room....

    http://optimalbuilding.com/files/ele...n_the_room.pdf

    Interesting read. However, a real world test (as opposed to theories and thoughts and hearsay) by the Florida Solar Energy Center found that...
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    1. If you have rental house you need the HVAC to...

    1. If you have rental house you need the HVAC to work (or you have unhappy and former renters). So CALL the manufacturer and discuss with them to see if they will help. If they will good. If not...
  4. What Teddybear said.

    What Teddybear said.
  5. Skippedover: I would add one comment to your...

    Skippedover:

    I would add one comment to your guide. The good salesman will do two things: (1) A load calculation and (2) ask if the existing unit was keeping the house cool and warm.

    The...
  6. "Seasonal energy efficiency ratio (SEER): Ratio...

    "Seasonal energy efficiency ratio (SEER): Ratio of the cooling output divided by the power consumption. It is the Btu of cooling output during its normal annual usage divided by the total electric...
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    I am extremely confused. 1. "My HVAC works...

    I am extremely confused.

    1. "My HVAC works well to keep home warm in winter and cool in summer."

    2. "I am located in Minnesota. Starting in early fall and through early spring, my house gets...
  8. To answer your question about how two differernt...

    To answer your question about how two differernt people could come up with different Manual J estimates:
    - it is an ESTIMATE (and it can be wrong by 20% even if done very carefully)
    - different air...
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    jimj: I don't recall for sure. It has been a...

    jimj: I don't recall for sure. It has been a year since I read the study but that data might be in the study. I don't think they replaced ducts - just the HVAC units.
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    Oh, and call the BBB. I disagree with Fearless...

    Oh, and call the BBB.

    I disagree with Fearless on cost. In today's difficult economy somebody may give you a really good price to keep their staff employed or because they need the business. A...
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    A guy that takes lots of measurements and then...

    A guy that takes lots of measurements and then uses improper design temps is not really any better at sizing than the guy that uses a rule of thumb.

    Did anyone ask you if the existing unit...
  12. A load calculation is an ESTIMATE and even if...

    A load calculation is an ESTIMATE and even if done perfectly it is still an estimate. Ask what temperature each used for their calculations. A one degree difference in design temps could be the...
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    Actual savings differences between a 15 SEER and...

    Actual savings differences between a 15 SEER and 16 SEER or a 16 SEER and a 17 SEER will be hard to see. Predicted savings are usually higher than actual savings (many reasons). Units are tested at...
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    Udarrell wrote: "If U use a smaller unit that...

    Udarrell wrote: "If U use a smaller unit that runs longer & it pulls the humidity down well below 50%, then the sensible ratio will come back up: at 59F-IWB lower humidity latent load, Sensible goes...
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    Key in mind that a M J calculation assumes that...

    Key in mind that a M J calculation assumes that 1-3 days a year the unit might be slightly undersized. That is, it is not sized for the most extreme day of the year.
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    File a formal complaint with the Better Business...

    File a formal complaint with the Better Business Folks.
  17. Replies
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    Would it be realistic to extrapolate that if a 3...

    Would it be realistic to extrapolate that if a 3 ton system only ran for half the time on the hottest day of the year, that a 1.5 ton unit would be your most appropriate choice?

    Not necessarily. ...
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    Load calc used 75F internal temperature. Our...

    Load calc used 75F internal temperature. Our thermostat is 79F during occupied day, and 78F night.

    There is most of your answer. Heat transfer is a function of Delta T (outside temperature -...
  19. Oversizing heating or cooling units is a bad...

    Oversizing heating or cooling units is a bad idea. A properly sized unit will already be oversized except on the most extreme days (thus it is already over sized about 90 percent of the time).
    ...
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    Interesting answers. Both contractors said...

    Interesting answers.

    Both contractors said the units were properly sized. Contractor A did a load calc while Contractor B used knowledge that in GA the power company did a load calc for the...
  21. Air Mechanic: Once upon a time there was a...

    Air Mechanic:

    Once upon a time there was a company that had a kit you could install on your existing HVAC system. It added a small ground loop to your HVAC making it a hybrid. According to the...
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    The higher-SEER units utilize smaller compressors...

    The higher-SEER units utilize smaller compressors and larger coils (lower compression ratio),

    Okay so what are you disagreeing with? I said a more efficient compressor you said smaller - same...
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    Gotta ask - have you considered adding a bit of...

    Gotta ask - have you considered adding a bit of insulation or maybe sealing the windows? Even some radiant barrier insulation would help.

    18 degrees tells me the system is putting out some cold...
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    Depends upon how much insulation you already...

    Depends upon how much insulation you already have. It is a good product and you can install it yourself. Make sure to keep an air space or it will not work. Probably need to try installing one...
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    Ga-HVAC-Tech said " Mounting a higher SEER...

    Ga-HVAC-Tech said " Mounting a higher SEER condenser (AC unit) on a lower SEER coil is a recipe for a mess... At the least your will have higher elec bills.. IF (and that is a big IF) it works... "
    ...
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