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  1. Replies
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    Yes that will work. It won't account for ductwork...

    Yes that will work. It won't account for ductwork losses.
  2. Replies
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    Know your electric and NG rates before deciding.

    Know your electric and NG rates before deciding.
  3. Replies
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    950

    Buy a thermometer with a wire lead/sensor. They...

    Buy a thermometer with a wire lead/sensor. They aren't very expensive.
  4. Thread: CFM

    by 54regcab
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    496

    Must have been exceptionally Crappy ductwork.

    Must have been exceptionally Crappy ductwork.
  5. Replies
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    950

    If the system falls too far behind it's too long....

    If the system falls too far behind it's too long. On 105f days my system will run 5 hours non-stop and loose about 3 degrees from setpoint (set @ 75, gets to 78). 78f feels great when it's 105f...
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    146

    Happens all the time, especially with oversized...

    Happens all the time, especially with oversized (4+ burners in our area) systems. Carrier gas furnace give "33" and kills 24v, Goodman gives "4". We don't do oil in Oklahoma, but it wouldn't surprise...
  7. Thread: CFM

    by 54regcab
    Replies
    14
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    496

    On larger systems (over 3 tons) the ductwork...

    On larger systems (over 3 tons) the ductwork rarely delivers rated airflow. Most ductwork (especially returns) is too small.
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    I see it happen all the time. Homeowner never...

    I see it happen all the time. Homeowner never notices with mechanical or battery power thermostats.
  9. Why is expanded performance data a big secret...

    Why is expanded performance data a big secret that manufacturers normally keep "behind closed doors"? What is a homeowner going to do with it that would create a liability issue? Install/charging...
  10. Does the heat pump run constantly? Are you aware...

    Does the heat pump run constantly? Are you aware of how much AUX heat you are using? What is temp of the air from the registers when only the HP is running? How much does it increase when AUX kicks...
  11. Try installing commercial registers that can be...

    Try installing commercial registers that can be pointed at the floor. Low cost solution that may work well enough for you.
  12. Being 10% short on rated capacity isn't your...

    Being 10% short on rated capacity isn't your issue. I doubt the system is even delivering the full rated 3.5tons.
  13. Replies
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    950

    Have the house tested and fixed/air sealed if you...

    Have the house tested and fixed/air sealed if you want to see real savings on your utility bills. ManJ is a calculated guess if you don't have the actual ACH number.
  14. Replies
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    950

    That's what happens when you actually deliver the...

    That's what happens when you actually deliver the rated capacity....
  15. Replies
    76
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    950

    What do you consider a conservative setting? Was...

    What do you consider a conservative setting? Was that factored into the calculation? Conservative (77f or higher) settings tend to make the AC not run enough to remove humidity. 75f is ASHRAE...
  16. Replies
    76
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    950

    You're really close to the 500sqft "rule of...

    You're really close to the 500sqft "rule of thumb", 3 tons should be more than enough. A tight house should be closer to 750sqft per ton if ManJ is done accurately.
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    470

    Gas is cheap, delivery fees continue to rise....

    Gas is cheap, delivery fees continue to rise. Delivery fees cost more than the gas does !!
  18. I'm thinking the system isn't operating at...

    I'm thinking the system isn't operating at capacity or the insulation contractor missed something big.
  19. At what point do you go up to the next size? If...

    At what point do you go up to the next size? If net output of the 1.5 ton system is 1.3 tons do you go up a size? Will being 0.13 tons short make that much of a difference? How much of the shortage...
  20. If load calculations call for 1.43 ton a 1.5 ton...

    If load calculations call for 1.43 ton a 1.5 ton single stage should be perfect.
  21. Replies
    76
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    950

    What default temps for summer/winter did...

    What default temps for summer/winter did www.loadcalc.net use?
  22. Replies
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    225

    How much does running your current fan help with...

    How much does running your current fan help with circulation?
  23. In most cases it will work, but leaves a lot of...

    In most cases it will work, but leaves a lot of comfort and energy savings on the table when compared to a proper ManJ calculation.
  24. Replies
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    950

    50 degree split is 20f @ 70f indoors. How often...

    50 degree split is 20f @ 70f indoors. How often do you get below 20f?
  25. 750sqft per ton is awesome for climate zone 13....

    750sqft per ton is awesome for climate zone 13. Are your competitors still using 500sqft per ton for the most part?
  26. What do the load calcs typically come out at for...

    What do the load calcs typically come out at for most of your installs? How many sqft per ton is average for your area?
  27. I have a 44k ( 40k output ) furnace on a 1600sqft...

    I have a 44k ( 40k output ) furnace on a 1600sqft house. Only runs about 8 minutes out of 30 min cycle @ 32f outdoors. Furnace doesn't really get cranking until temps get down to the lower 20s.
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    Check the monthly gas meter fees, you may be...

    Check the monthly gas meter fees, you may be better off with an all-electric home. I'd do a minisplit for the basement. Insulate air seal the house, keep equipment ducts in conditioned space. Built...
  29. 3.5 tons will heat/cool a 3200sqft house if it's...

    3.5 tons will heat/cool a 3200sqft house if it's built tight. The heat pump must deliver it's FULL CAPACITY, not the 2/3's that's typically delivered. An energy audit will determine if you are...
  30. With a 2 ton system the difference between high...

    With a 2 ton system the difference between high and low is only 8,000BTU. I don't think he will notice the difference on such a small system, especially when a larger system is serving the...
  31. I wouldn't bother with a 2 stage unit since it's...

    I wouldn't bother with a 2 stage unit since it's a secondary unit for upstairs. Ductwork/air distribution/thermostat location will most likely make a bigger difference for upstairs comfort.
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    Put a PSC back in, you will never see enough...

    Put a PSC back in, you will never see enough savings on your power bill to justify the cost of the ECM.
  33. Looks like a typical 500sqft per ton sizing job.

    Looks like a typical 500sqft per ton sizing job.
  34. 100k 92% furnace needs 1,500CFM of air to stay...

    100k 92% furnace needs 1,500CFM of air to stay off limit. That's a LOT of airflow. Odds are you are oversized and/or don't have enough ductwork. How many filters and what size?
  35. Look at AHRI matches. 5 ton units rarely get the...

    Look at AHRI matches. 5 ton units rarely get the "up to" SEER rating. If you want to save money on utility bills tighten up the house/ductwork and install a smaller heat pump. Make absolutely sure...
  36. With a small system the staging doesn't have as...

    With a small system the staging doesn't have as big of an effect as it does on larger systems. With a relatively small system either your house is relatively tight or low sqft. Is this the only...
  37. 5 tons isn't undersized if the house is built...

    5 tons isn't undersized if the house is built tight. The system not performing at it's rated capacity seems to be your issue.
    Situations like this is exactly why I don't like these advanced zone/VS...
  38. Replies
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    What is your winter design temp?

    What is your winter design temp?
  39. Replies
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    500sqft per ton certainly works, it's been used...

    500sqft per ton certainly works, it's been used for years. Going from an old AC to a new one will normally save enough $$$ that you won't question how much extra you would have saved by going to a...
  40. Replies
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    How much are you turning down the temp on your AC...

    How much are you turning down the temp on your AC for humidity relief? 75-78f feels great when the humidity is in the 40's from the AC running a lot. The difference in night low temps just means the...
  41. Replies
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    Until they ban R22 dry units what's the point of...

    Until they ban R22 dry units what's the point of setting minimum SEER standards for new equipment?
  42. Replies
    76
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    950

    3 tons is still too big if you have a tight...

    3 tons is still too big if you have a tight house. How much airflow will your ductwork support?
  43. Replies
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    99-76 = 23 degree spread. Using the link input...

    99-76 = 23 degree spread. Using the link input your desired temps. I just used the 96/75 defaults.

    You have to find the right contractor that understands building science and home performance....
  44. Replies
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    950

    Look up the design temp for your city, 105f is...

    Look up the design temp for your city, 105f is too high and will result in oversizing. As you know OKC gets above 97 regularly, yet that is our design temp. I'm OK with the AC falling 2-3 degrees...
  45. Replies
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    EER is a 15f indoor/outdoor difference which...

    EER is a 15f indoor/outdoor difference which means 90f/75f for most people. 90/75 is a very realistic operating condition and is why EER is more important than SEER.
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    Could you simply drop all the bin temps by 5...

    Could you simply drop all the bin temps by 5 degrees? Using the same 2 degree difference that would be a 77f outdoor temp used for SEER ratings. Talk about worthless. Using the EER 15 degree...
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    Keep in mind the ratings are at 80f indoors !!!

    Keep in mind the ratings are at 80f indoors !!!
  48. Replies
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    950

    FWIW my house was built 1999, 1600sqft, no...

    FWIW my house was built 1999, 1600sqft, no radiant barrier, R19 attic, 10' ceilings in about 1/2 the house. House is in Moore OK, near OKC, 97f design temp. I have a 2 TON AC that will hold 75f...
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    Listen to udarrell, people put WAY too much...

    Listen to udarrell, people put WAY too much thought into rated SEER.
    The bin temps he listed are at 80f indoors !!!
    80f is a service call, not a normal operating condition. Knock 5f off the bin...
  50. Replies
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    1950's house, single pane windows with no...

    1950's house, single pane windows with no insulation in walls? Does ceiling insulation need upgrading? Tighten the house up before spending big $$$ on a HVAC system. You might even be able to get the...
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