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  1. #1
    Join Date
    Jun 2008
    Posts
    28

    Opinion of these Lennox systems

    I'm having 2 Lennox central units installed in my house today and was hoping someone here could would offer up an opinion on them.

    The house is 2900 sq ft, 1250 upstairs, 1650 down. The lower level is built into a hillside, below ground at the back and both sides. I've always had a difficult time with humidity downstairs. It's has always been very easy to cool, but very uncomfortable because of the humidity. Upstairs has been the opposite, humidity not a problem, but the old 2 ton unit for upstairs, a 25 year old Lennox, ran constantly and struggled to reach 75 degrees indoors. Location is central Oklahoma.

    The new equpment going in:
    Upstairs will be a Lennox XC14-30 outdoor unit, CR33-30/36A-F coil and G50DF-36A-70 furnace. Tstat is WR 80 Series, 1F80-0471.

    Downstairs is XC14-024 outdoor, C33-24A-2F-4 coil and G60UHV-36A-070 furnace. Tstat is Lennox ComfortSense 7000 series, L7742U.

    Does this equipment look to be decent for this application? I know "zero" about this stuff and was dependent on the salesman to recommend and size this stuff.

    Appreciate any thoughts or suggestions on this project. Also, any idea what the SEER ratings of these systems as described would be? Thanks.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    What size was/is the old A/C for the downstairs.

    You can go to teh ARI website and find teh true SEER rating of those units.
    Could be a littler more then their 14 designation, or a little less.
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  3. #3
    Join Date
    Jun 2008
    Posts
    28
    The old unit was 1.5 ton. New unit is 2 ton. This is for downstairs.

    Upstairs was 2 ton, new unit is 2.5 ton.

    I'll check again on ARI site for the SEER. Had a problem I guess matching the components when I tried it earlier, but I'll give it another shot.

    The units are both running now. The upstairs unit is running 83 degree air at a return grill and 64 degree at a supply register. It's been running for about 45 minutes. Outside air temp today is around 95.

    Downstairs unit is running 77 degrees at return and 64 at supply register.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    Your downstairs cooled ok but had high humidity. So they put a bigger unit in to cool it faster and have higher humidity yet?
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  5. #5
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,741
    why no v drive on 2nd floor??

    if i was only going to have one it would be the one doing the bedrooms and being used the most for a/c season.........

  6. #6
    Join Date
    Mar 2006
    Location
    The South
    Posts
    2,189
    merciles

    for full disclosure, not a fan of Lennox.

    Do you mind stating your electric rate and nat gas rate?

    Here are the ARI performance numbers as best I could match.

    downstairs
    1234907 Active OEM XC14 SERIES LENNOX INDUSTRIES, INC. XC14-024-230* C33-24+TDR+TXV G60UHV-36A-070* 23200 12.50 14.70 CEE Tier 1

    upstairs
    I could not find a match using the G50 furnace.

    A couple of observations.

    1.I suggest you request the cooling BTU load in writing for both the upstairs and downstairs systems.
    2.Based on your location and depending on electric rate and considering nat gas prices, for downstairs I do not like 80% eff furnace unless paired with matching heat pump.
    3.I do not like a non var speed furnace for upstairs. I suggest a HP with var speed air handler.

    a few ideas.

    IMO

  7. #7
    Join Date
    Jun 2008
    Posts
    28
    Quote Originally Posted by t527ed View Post
    why no v drive on 2nd floor??

    if i was only going to have one it would be the one doing the bedrooms and being used the most for a/c season.........
    the load on the upstairs is mainly heat, humidity was not a problem. there is one bedroom upstairs and three downstairs.

    so, he said the vari speed blower would not be needed on the upstairs unit.

  8. #8
    Join Date
    Jun 2008
    Posts
    28
    Quote Originally Posted by beenthere View Post
    Your downstairs cooled ok but had high humidity. So they put a bigger unit in to cool it faster and have higher humidity yet?
    originally he quoted a 2.5 ton for downstairs. after we discussed the humidity issue he recommended a 2 ton, as I understood it, to run longer for dehumidification. Also I think there is dehumidification on cooling with the vari speed air handler and stat...

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    Keep track of the downstairs humidty. If it gets higher, you'll end up with mold.
    If you discover that the humidity is higher with the bigger downstairs unit this week, you may be able to get him to put a smaller unit in before it causes you too much trouble.
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