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  1. Well, the Output of that furnace should be around...

    Well, the Output of that furnace should be around 57,000-Btu/hr.

    So, 42 times 1.08 is 45.36; 57000-Btu/hr output / 45.36 is 1256-CFM.
    Maybe the furnace setup is not delivering that much output;...
  2. A-Men, to Rider77

    A-Men, to Rider77
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    Well, my load-calc said 30,000-Btuh at -15F...

    Well, my load-calc said 30,000-Btuh at -15F winter design which is a few degrees below winter design.
    I let the tech install what he wanted to; a 95% 60,000-Btuh Input about 57,000-Btuh output.
    ...
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    Also, new windows though nice, are high dollar;...

    Also, new windows though nice, are high dollar; usually takes quite a while to recoup their cost.
    If you have storm windows, they usually do very well...
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    I don't know what your climate is or energy...

    I don't know what your climate is or energy efficiency of the home, however usually 750 sf per ton will handle the load.
    well 2914-sf / 750-sf per ton is 3.9-ton; / by 2 is 1.95 or 2-ton each.
    ...
  6. A 12" 'flexible return duct' is not nearly large...

    A 12" 'flexible return duct' is not nearly large enough for even a 2.5-Ton A/C needing 1000-CFM of airflow; the friction loss is way too high on 100 foot-run; actually requires a 16" flex-duct. A 14"...
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    You need to do a load-calc....

    You need to do a load-calc. http://www.loadcalc.net/

    Print the instructions & don't cheat.
    Usually you can do what is necessary to make 750-sf per ton of cooling to work in FL; that would be 2.26...
  8. I question whether Lennox will do any better than...

    I question whether Lennox will do any better than the others unless there are other efficiency factors used that are unaccounted for.(?)
  9. The actual cooling cost would depend on a...

    The actual cooling cost would depend on a multitude of things that affect how much the costs turn out to be; that usually cannot be accurately estimated between units.

    The home, the quality of...
  10. Too low an airflow will reduce system's capacity...

    Too low an airflow will reduce system's capacity too much.
    Too few companies check actual airflow to the rooms; could be losing a lot from leaky ducts or perhaps the fan speed is not set right.
    ...
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    That appears to be more airflow than is needed;...

    That appears to be more airflow than is needed; I'd think you could drop the CFM so the closest register got a 50F temp-rise.

    Most furnaces allow a 60F temp-rise just after the heat-exchanger,...
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    Let's do some ballpark Btuh figuring a customer...

    Let's do some ballpark Btuh figuring a customer could do.

    If you live in the Wellington, North Carolina area the summer design is 91 Fahrenheit dry bulb 78 Fahrenheit wet bulb or 55% relative...
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    I agree; we need some National HVAC Codes to...

    I agree; we need some National HVAC Codes to cover the procedures necessary for a decent quality install...

    Also, a whole house and Duct System energy efficiency code...

    We need to explain why...
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    First, IMO, every install & most service work...

    First, IMO, every install & most service work ought to involve a "Btuh Delivered to the Rooms Performance Test."
    The system should have to pass a National Code performance bench mark so that a...
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    So, he is certified on Rheem's website; if you...

    So, he is certified on Rheem's website; if you hadn't had advice from this forum that install would have led to a disastrous costly situation for you ... an unbelievably bad install...
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    The Rated tonnage has little to do with the...

    The Rated tonnage has little to do with the actual delivered performance tonnage to & from the rooms.

    Every system should be tested for "Delivered Performance."
    Actual Delivered (Btuh) Tonnage is...
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    SIZING SYSTEM

    This is the time when you test the airflow delivery of the duct system.
    The duct system may not handle 3.5-Ton of cooling or the furnace Btu rating.

    Your home should have an Energy Efficiency...
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    penderway; Great Insight! I am wondering...

    penderway; Great Insight!



    I am wondering if the evaporator orifice is properly matched to the new condenser.
    It would be very important to know what CFM is being delivered per ton of...
  19. What size is the filter area under the furnace? ...

    What size is the filter area under the furnace?

    Looking at the pdf; they rated the fiter at 300-fpm velocity; at 50% open-air-area (Ak) it would only flow 300-CFM @300-fpm velocity.

    What size...
  20. We need a lot more information: What is the...

    We need a lot more information:
    What is the tonnage of the condenser, or model number?

    What type of filter are U using?
    one inch pleated filters are too restrictive.



    If U had two 1"...
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    That is an awful fast SH drop! Could the...

    That is an awful fast SH drop!
    Could the diffusers somehow be adversely affecting the return air temp?

    Well, at 85F outdoors and a 66F indoor wet bulb, SH is 15F; as the indoor wet bulb...
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    Oversizing could make the upper level situation...

    Oversizing could make the upper level situation worse due to shorter runtimes.
    Pay attention to George2 & 2old2rock...duct remediation required.

    Having a Manual D performed on the system might...
  23. Not in my opinion. What makes U think they're...

    Not in my opinion.
    What makes U think they're superior? :whistle:
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    Well; what happens is it's shorter to type & most...

    Well; what happens is it's shorter to type & most think its refrigerant rather than a Brand Name.
    I've even done it on rare occasions to save typing refrigerant...:whistle:

    Best to use short but...
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    If you want to ballpark the sensible & then the...

    If you want to ballpark the sensible & then the total Btuh; say indoor temp-drop is 20F at 50%RH.

    Say the 2.5-Ton is delivering a Goodman low speed listed 945-CFM; 20F * 1.12 is 22.4 * 945-CFM...
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