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  1. Replies
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    When it comes time to replace the 21yr old system...

    When it comes time to replace the 21yr old system include a 4" media filter in the bid.
  2. Replies
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    998

    Your spent the money for a nice furnace, don't...

    Your spent the money for a nice furnace, don't cripple it by not using the matching thermostat.
  3. Replies
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    998

    A single 16x25 filter won't flow much air. How...

    A single 16x25 filter won't flow much air. How many BTU is the furnace?
  4. 18 SEER that isn't variable speed/2 stage becomes...

    18 SEER that isn't variable speed/2 stage becomes a 15 SEER. Both have about the same EER @ 95f outdoors/80f indoors (15 degree difference). SEER test is @ 82/80 (2 degree difference).
  5. As long as they are wired to run at the same time...

    As long as they are wired to run at the same time it shouldn't be an issue.
  6. Running 44k on 1600sqft here.

    Running 44k on 1600sqft here.
  7. Replies
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    345

    There is a HIGH profitability that your current...

    There is a HIGH profitability that your current "2.5 ton system" wasn't actually delivering 2.5 tons of cooling. It's not uncommon for systems to only deliver 2/3's of their rates capacity, some are...
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    335

    Outdoot combustion air will make up the 2k...

    Outdoot combustion air will make up the 2k shortage vs old furnace.
  9. Replies
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    335

    Furnace should "struggle" in extreme conditions....

    Furnace should "struggle" in extreme conditions. As long as it maintains setpoint don't upsize. The larger 2 stage will never leave 1st stage.
  10. Replies
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    351

    Unless your house is VERY leaky, it shouldn't...

    Unless your house is VERY leaky, it shouldn't need 3 tons to cool it. My house is 1600sqft and 15yrs old. 2tons cools it just fine, and we're in a HOTTER climate. Sounds like the contractor is using...
  11. Replies
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    335

    Why install a 60k furnace if the heat load is 45k?

    Why install a 60k furnace if the heat load is 45k?
  12. Replies
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    364

    The 3 for $10 pleated filters work well. Just...

    The 3 for $10 pleated filters work well. Just change them often.
  13. Replies
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    408

    If the furnace is oversized enough the house will...

    If the furnace is oversized enough the house will stay warm even though it's cycling on high limit.
  14. Clock you gas meter and see how much fuel your...

    Clock you gas meter and see how much fuel your furnace is actually burning.
  15. Replies
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    408

    Did you have the tech test for airflow issues...

    Did you have the tech test for airflow issues when the exchanger was replaced?
  16. Rise profiles certainly do vary. Many...

    Rise profiles certainly do vary. Many instructions will say run 10 minutes before testing pressures. The smaller the system, the more often it will get to the 10 minutes during normal operation.
  17. Also it takes 5-10 minutes before the system...

    Also it takes 5-10 minutes before the system reaches full efficiency.
  18. For optimum humidity control you want the...

    For optimum humidity control you want the compressor to run as long as possible.
  19. FAR more compressors are killed due to oversizing...

    FAR more compressors are killed due to oversizing vs. undersizing. It's start/stop that kills them, not long run times. Oversizing also hides issues such as dirty coils/improper charing, which is the...
  20. Replies
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    647

    So its more efficient for a large furnace to...

    So its more efficient for a large furnace to cycle from low to off vs. smalller furnace cycle from high to low? If that is true why bother with 2 stage furnace at all?
  21. Replies
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    647

    Does it produce more heat or use less gas?

    Does it produce more heat or use less gas?
  22. Replies
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    647

    The 60k would not shut off at all, it would just...

    The 60k would not shut off at all, it would just switch between high and low as needed. IMHO that would be better comfort than the 75k going from low to off each cycle.
  23. Replies
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    647

    How would 75k on low provide better comfort than...

    How would 75k on low provide better comfort than 60k on high during colder weather?
  24. Replies
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    647

    75k on low stage should be close in output to a...

    75k on low stage should be close in output to a 60k single stage. How will the 75k provide better comfort? Wouldn't a 60k 2stage provide the best comfort due to longer run times on low stage?
  25. Replies
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    647

    Correctly sizing the furnace is about comfort,...

    Correctly sizing the furnace is about comfort, the closer you are to the load the more even the temps will be. The only reason to install a furnace larger than Man J calls for is to speed up recovery...
  26. Replies
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    At 600sqft per ton with an outdoor temp of 60f it...

    At 600sqft per ton with an outdoor temp of 60f it won't take long to heat the house. We don't even turn our heat on until it's less than 50f outdoors, you may want to find out why your house is cold...
  27. Replies
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    647

    Why a 75k furnace instead of a 60k if you only...

    Why a 75k furnace instead of a 60k if you only have a 55k heat loss? Is the furnace you are looking at offered in a smaller size that still meets the 55k output?
  28. 2nd stage wire never hooked up w/o a customer...

    2nd stage wire never hooked up w/o a customer complaint for years means the system was grossly oversized to begin with. Very common to find 2 stage sized based on stage 1.
  29. Replies
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    677

    How much difference is there is compressor KW?

    How much difference is there is compressor KW?
  30. Replies
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    1,142

    34 SST with 60f degree air coming out of the...

    34 SST with 60f degree air coming out of the vents? Are you measuring with a probe or IR thermometer? What is the air temp at the coil?

    34F is right above freezing, system may have been...
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    Difficult to know delivered EER and SEER without...

    Difficult to know delivered EER and SEER without doing measurements.
  32. Is the building insulated?

    Is the building insulated?
  33. Replies
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    I'm running 44k on 1600sqft. Got down to 5...

    I'm running 44k on 1600sqft. Got down to 5 degrees last winter (design is 17f, last year was unusually cold), still wasn't "maxed out". Old furnace was 88k !!!
  34. The sad thing is 90% of 2 stage installs never...

    The sad thing is 90% of 2 stage installs never use the 2nd stage unless the system is in recovery from setback. If furnaces weren't 2-3x the size needed, 2 stage might actually work as intended. Then...
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    The SLP98V starts at 70k size, it may be too much...

    The SLP98V starts at 70k size, it may be too much for 850sqft.
  36. 2 stage is more about comfort than savings. EER...

    2 stage is more about comfort than savings. EER is close for both systems.
  37. Replies
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    The only way that you can move 1900CFM with @...

    The only way that you can move 1900CFM with @ 100W is with an unrealistic static pressure. 100W is only 0.13HP IF the motor is 100% efficient.

    13W is 0.02HP, no way that's 1,000CFM with any type...
  38. Did they cut anything when they added 50% more...

    Did they cut anything when they added 50% more ductwork?
  39. Tighten the house and downsize the system....

    Tighten the house and downsize the system. Install a small single stage. You get the energy savings and comfort of the 2 stage w/o the added complexity. For the difference in price you can do quite a...
  40. Why would you want to run heat in one zone, but...

    Why would you want to run heat in one zone, but cooling in another? Heat downstairs, let the heat float upstairs, then cool the upstairs? How you own stock in the local utility company.
  41. Things were built to LAST back then. Systems used...

    Things were built to LAST back then. Systems used to cost more (inflation adjusted).
  42. Smaller units do in fact use less energy, and the...

    Smaller units do in fact use less energy, and the compressors tend to last longer also. Compressors rarely "wear out" from running a certain number of hours.
  43. Poll: I like the 5,000k bulbs, much "cleaner light". ...

    I like the 5,000k bulbs, much "cleaner light". 2700k is only around to imitate the 100yr technology that it's replacing.
  44. Tightening the house, correct sizing, and proper...

    Tightening the house, correct sizing, and proper installation is what saves money.
  45. +2. The smaller system on a tighter house is what...

    +2. The smaller system on a tighter house is what saves money. Watch the video I posted on the last page, it explains it well.
  46. FWIW we have a 44k furnace on our 1600sqft house....

    FWIW we have a 44k furnace on our 1600sqft house. It got down to 5 degrees last winter, the furnace still wasn't "maxed out". Old furnace was 88k, it would cook you when it was on and freeze when it...
  47. Most landlords around here cheap out and just put...

    Most landlords around here cheap out and just put a regular AC in. Strip heat for the heater, they ain't paying the electric bill !!!
  48. What is your humidity level with that 72f cooling...

    What is your humidity level with that 72f cooling setpoint? Makes a BIG difference, 72f cooling is too cold for me when the humidity is low, but doesn't feel cool enough it humidity is high 72f heat...
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    That is standard.

    That is standard.
  50. Replies
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    I was wondering about that too.

    I was wondering about that too.
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