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  1. Replies
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    This is not the way it should work. The wiring...

    This is not the way it should work. The wiring needs to be changed.

    The pump should turn on when the thermostat calls for heat and should turn off when the thermostat no longer calls for heat.
    ...
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    The problem you describe is almost always caused...

    The problem you describe is almost always caused by poorly installed and/or inadequate insulation in the garage ceiling. You may also have other insulation or air leakage deficiencies.
  3. Replies
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    1,452

    Another good reason not to oversize is that...

    Another good reason not to oversize is that larger furnaces are noisier.
  4. Replies
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    2,157

    This is not necessarily true: check out the...

    This is not necessarily true: check out the charging instructions for fixed orifice Lennox equipment.
  5. Thread: attic vening

    by Panama
    Replies
    19
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    1,280

    It's all about radiation from the roof to the...

    It's all about radiation from the roof to the insulation and then into the house through the ceiling. Manual J may not ask about the amount of attic ventilation, but it does ask about the type and...
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    830

    Follow Billva's advice and you will save a lot of...

    Follow Billva's advice and you will save a lot of money over the years. It takes about 8,700 Btus to evaporate one gallon of water. This is true whether you heat the water to evaporate it or...
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    691

    You are essentially correct. An uninsulated...

    You are essentially correct. An uninsulated floor over a normally vented crawl space will not increase the cooling load significantly.

    The biggest problem with HVAC-Calc (unless there is a new...
  8. Replies
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    1,986

    ACH nat = 0.69 = NOT GOOD AT ALL. Good is < 0.25

    ACH nat = 0.69 = NOT GOOD AT ALL. Good is < 0.25
  9. Replies
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    2,340

    Dry homes are usually caused by air leakage to...

    Dry homes are usually caused by air leakage to and from the outside. The air leakage problem is exacerbated by forced air systems with supply/return imbalances -- particulary in bedrooms with...
  10. Replies
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    1,196

    Springfield digital -- six or seven bucks at...

    Springfield digital -- six or seven bucks at Walmart.
  11. Replies
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    1,365

    Since it wasn't cheap, why not make it look...

    Since it wasn't cheap, why not make it look really pretty:

    http://www.accovers.com
  12. Thread: rule of thumb

    by Panama
    Replies
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    1,133

    No.

    No.
  13. Replies
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    http://www.accovers.com

    http://www.accovers.com
  14. Replies
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    675

    Most likely causes are insulation faults and air...

    Most likely causes are insulation faults and air leakage. The best approach is to shell out three or four hundred bucks for a good home energy audit that includes a blower door test and some sort of...
  15. Replies
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    3,171

    Here is an article showing how to design and...

    Here is an article showing how to design and build a proper trap: http://www.hpac.com/member/archive/pdf/2001/1001/brusha.pdf#search='condensate%20traps%20for%20cooling%20coils'
  16. Replies
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    3,590

    Better grab the installation booklet before the...

    Better grab the installation booklet before the installer messes it up using it for knee pads. The city inspector may want to see it, too.
  17. Replies
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    549

    You probably can find a contractor with a Duct...

    You probably can find a contractor with a Duct Blaster here http: http://www.energyconservatory.com.
  18. Replies
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    2,091

    And you can't check for proper charge just by...

    And you can't check for proper charge just by measuring pressures.
  19. Replies
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    1,695

    Isn't world trade wonderful! My neighborhood has...

    Isn't world trade wonderful! My neighborhood has a number of Australian Breezeair evaporative coolers. Best swamp cooler on the market!
  20. Replies
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    1,104

    A house does hold A LOT of heat -- particularly...

    A house does hold A LOT of heat -- particularly one built with brick. Our AC has run only 4 hours this month with most of it occurring after 9:00 p.m. when the thermostat sets back from 73F to 71F....
  21. Replies
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    1,224

    True. I call it aggressive air: it sucks the...

    True. I call it aggressive air: it sucks the moisture right out of you.
  22. Replies
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    1,224

    Originally posted by Carnak [B] You...

    [QUOTE]Originally posted by Carnak
    [B]

    You are 100% correct. The actual air flow must be increased about 21% (more in mountain communities) to get the equivalent of sea level mass flow.

    The...
  23. Replies
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    1,224

    Two conditions really help reduce the AC...

    Two conditions really help reduce the AC equipment needs in Denver, but increase the risk of the indoor coil freezing up.

    First, the latent load of a typical home in the Denver area is negative. ...
  24. Replies
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    1,753

    The C33-42 coil is a size B. The C33-44 is a...

    The C33-42 coil is a size B. The C33-44 is a size C. Your furnace is a size C and should be matched with a size C coil. The both have the same face area, but the fin spacing is different.
  25. Replies
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    http://www.unicosystem.com is up and running.

    http://www.unicosystem.com is up and running.
  26. Replies
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    5,543

    Did they pull a permit for the new boiler...

    Did they pull a permit for the new boiler installation?
  27. Replies
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    5,543

    You should demand they redo it correctly. The...

    You should demand they redo it correctly. The whole idea with steam piping is to get DRY steam up into the supply main. The Burnham diagram shows you how it is done.

    You simply must not have the...
  28. Replies
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    By making the interior rooms and other spaces add...

    By making the interior rooms and other spaces add up to the total square footage of the house you have an easy way to make sure you have included everything.
  29. Replies
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    Sounds like pretty sloppy work to me. You can...

    Sounds like pretty sloppy work to me. You can get the ducts tested for leaks. You might find a local contractor with a Duct Blaster on this site: http://www.energyconservatory.com/.
  30. Replies
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    698

    Draw the rooms out with zero-width interior and...

    Draw the rooms out with zero-width interior and exterior walls. Include the closets and any mechanical chases in the room areas. If the program you are using does not have a drawing feature, draw...
  31. Replies
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    1,348

    Why not charge the systems the way Lennox says to...

    Why not charge the systems the way Lennox says to do it?
  32. Replies
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    Long runs and inadequate air flow could lower the...

    Long runs and inadequate air flow could lower the indoor dew point enough to trip a freezestat.
  33. Replies
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    1,755

    Your sensible heat ratio is 0.89, and so your...

    Your sensible heat ratio is 0.89, and so your system should run at approximately 450 CFM per ton, not the usual 400 CFM per ton. Failure to have ample air flow will reduce your cooling capacity and...
  34. Replies
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    3,930

    Here is an example of the engineering data that...

    Here is an example of the engineering data that most manufactures make available to their chosen few. The Expanded Ratings Tables give you the capacities at common indoor conditions, outdoor...
  35. Replies
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    3,918

    Is your air conditioner a large louvered box that...

    Is your air conditioner a large louvered box that sits on top of your roof? (Just kidding -- we have lots of those in my area.)
  36. Replies
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    3,930

    Be aware that HVAC-Calc doesn't account for...

    Be aware that HVAC-Calc doesn't account for shading of windows by eaves or other overhangs. The reduction in load can be considerable.

    HVAC-Calc is based on Manual J, 7th Edition, and does not...
  37. Replies
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    3,930

    What is the load breakdown (sensible and latent)?...

    What is the load breakdown (sensible and latent)? Manual S says you should size your AC to the sensible load and just make sure it will cover the latent load.

    I just took a quick look at some...
  38. Replies
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    4,256

    Not all 13 SEER matchups need a TXV. Your older...

    Not all 13 SEER matchups need a TXV. Your older condensing unit and your new coil probably aren't rated together anyway. Yes, a TXV can be added to an existing coil. No, a new evaporator coil may...
  39. Replies
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    The law of thumb for a very dry climate.

    The law of thumb for a very dry climate.
  40. Replies
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    And: Bigger, warmer evaporator coils. 410-A...

    And:

    Bigger, warmer evaporator coils.

    410-A helps, too.
  41. Replies
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    2,260

    0.25 ACH50? From whence cometh air to breathe?

    0.25 ACH50? From whence cometh air to breathe?
  42. Replies
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    3,028

    Was the study free? Did they do a blower door...

    Was the study free? Did they do a blower door test? Duct Blaster or similar test for duct leakage? Any recommendations for sealing envelope penetrations? Any recommendations for better windows?
  43. Replies
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    3,028

    It seldom pays to take a piecemeal approach to...

    It seldom pays to take a piecemeal approach to solving home comfort issues. You really need to look at your whole house as a system. The best way to get started on this is to pay for a whole house...
  44. Replies
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    This should answer your question: ...

    This should answer your question:

    http://cec.ishow.com/mod/index.cfm?ModCon=hvac&SubCon=sphc_res&TxtModCon=hvac_txt
  45. Replies
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    Re: 2 stage furnace - way to go !

    I'm curious how you determined that your Trane furnace is derated 12%.

    Xcel does not deliver "natural gas" in the Denver area; they deliver "mixed gas" that has a heat content of only about 830...
  46. Replies
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    1,482

    http://cgi.ebay.com/White-Rodgers-thermostat-1F97-...

    http://cgi.ebay.com/White-Rodgers-thermostat-1F97-371_W0QQitemZ280011819402QQihZ018QQcategoryZ115949QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
  47. A 2-ton is probably the correct size IF your...

    A 2-ton is probably the correct size IF your house has:

    Good insulation in the walls and attic.
    Good modern dual-pane windows with a SHGC below 40.
    Window to floor ratio of no more than 15%....
  48. Replies
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    2,646

    It is unusual to find a truly undersized...

    It is unusual to find a truly undersized residential system. Cooling problems can almost always be solved by correcting the charge or by finding and repairing leaks in the ducts and air handler. In...
  49. Replies
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    1,367

    It is common for siding contractors to cover up...

    It is common for siding contractors to cover up gable and soffit vents with slotted siding that is far more restrictive that the original vents. These slotted vents don't comply with the building...
  50. Thread: Is this normal?

    by Panama
    Replies
    7
    Views
    889

    And have your ducts checked for leakage.

    And have your ducts checked for leakage.
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