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  1. #14
    Join Date
    Aug 2006
    Location
    Dallas
    Posts
    16
    I respectfully disagree with Beenthere about the minimal SEER increase by adding a TXV valve. I indeed find that with those cheaper, very small condensor 10 SEER systems the efficiency gain is lower, but overall with a decent 10 SEER system you can expect at least 10% efficiency improvement and less wear on the compressor.

    But, of course, adding a TXV valve is easily said. It takes quite some work and needs to be done properly by a trustworthy professional. If you only plan to keep your system for another year or two, don't bother looking into this. You'll never get your investment back.

    Don't try to re-use an old TXV valve when you buy a new system. The TXV valve itself is not expensiver and most new systems come with it.

  2. #15
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    Well, if I find my old CD, with the ratings of 10 SEER units with the TXV added only showing .25 and .5 SEER increase I'll post the rating.

    Its not just the TXV, its the type of TXV. A balance port will improve it more then a non balanced port.

    It also depends on the compressor in the system weather or not you'll get an improvement, and how much.
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  3. #16
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    H4DB030 10 SEER condenser with ARI matching F2RO036 air handler with piston, SEER 10.8,
    with TXV, SEER 11

    H4DB024 10 SEER condenser with ARI matching G1FA coil for furnace with piston, SEER 10.6,
    with TXV, SEER 11

    There are several other listings showing from .2 to 1 SEER, and some of them also require a TDR to get that full SEER increase.

    Don't get a TXV installed on your existing system to save operating cost alone.

    If your electric bill for cooling cost you 500 bucks for the year, the money you spent adding a TXV to an existing system can take longer then the life span left in the equipment.
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  4. #17
    Join Date
    Dec 2007
    Location
    Cedar Grove, Wi-Sheboygan
    Posts
    1,582
    So since my OD Unit is only 7yrs old 10 seer Payne that is used maybe 2-3 weeks a yr and I have a VS furnace it would not pay to have one installed. Does a VS furnace increase seer over just a single speed blower and having both a TXV and a VS blower would not raise the seer rating to make it worth having done ?

  5. #18
    Thanks for everyone's input!

    It makes complete sense that improving the attic insulation to R30 would decrease the demand or need for a larger capacity A/C unit.

    I am having an A/C person come out today to do the load calcs and perhaps I'll have someone from my electrical company as well. It may be that I can do the Attic only for now but the insulation person advised me to make sure any attic work is done 1st so people don't trample the insulation and reduce it's efficacy.

    In addition, I spoke with a neighbor who is a retired a/c repairman. He told me that this year is the year to upgrade if you want to be able to stick with R22. His opinion was that R22 is a superior refrigerant over R410a. From what I've gathered on this forum, however, I don't think that this is true. What do you guys think?

  6. #19
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    Neither refrigerant is better then the other.
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  7. #20
    The estimator came out today and said the current Rheem unit we have is a 3.5 ton system and that it is not adequate for a 2900sq ranch. He did the load calculations and estimated 53,000 btu with R19 attic insulation. I live in Orlando, FL btw.

    He recommended going with a 4 ton unit and adding a air return in our masterbedroom, a room which is always too warm. (The only air return is where the air filter goes in the wall.) This upgrade plus the insulation upgrade should be sufficient according to him.

    He's going to fax me the proposal tomorrow with 3 different systems, all Trane, as he is a Trane dealer.

  8. #21
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    How does the rest of the house cool with your current unit? Does it maintain the temp you set the stat to.
    If the rest of the house is cooling ok with your current 3.5 ton. That room may need a return, or more supply.
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  9. #22
    Yes, the rest of the home seems fine except for a sun room area. He suggested adding a return to the master bedroom and an additional supply on the other side of the room. He would also add a supply to our walk in closet that is always too hot and stuffy. I'll never understand the logic of supplies being placed only on one side of a ranch home with no returns other than the one at the air handler. Our roof and ceiling are vaulted and there is attic access throughout the entire home.

    We have a sun room that was an addition at some time that is interior space (i.e. not a screened in porch, etc) that has no supply either. That area is always warmer especially since it is lined completely with windows even though they are low e windows. He suggested adding a return there as well.

    He stated that the vent and duct sizing is appropriate and that the existing duct work had no issues.

  10. #23
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    You not going to get that sunroom to cool right with the same system as the rest of the house. I don't care how big of a unit is put in.
    It simply gains heat faster then the rest of the house.

    If the unit is cycling off while keeping the rest of the house cool, it sounds more like duct trouble then size.
    How ever, a good 4 ton 2 stage is ok.
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  11. #24
    I received the quote this morning for the following options:

    1. XR13 w/Variable speed, 14 seer/8.5, 4TWR3048, 4TEE3D40, var fan.
    48.5kbtu cooling/46kbtu heating

    2. XL15i w/Var, 14.25 Seer/9.00, 2TWX5048, 2TEE3D49, var fan
    47.0kbtu cooling/43.5 kbtu heating

    3. XL16i w/var, 15 SEER/8.5, 4TWX6048, 4TEE3D40, var fan
    45.5kbtu cooling/41.5 kbtu heating

    All 3 would use a BayHTR1405 15kw heater and the T-Con 803 thermostat.

    I will be adding a new return in the masterbedroom and 2 supplies, 1 on the opposite side of our masterbedroom and 1 in the master closet.

    I suppose I could just do the duct work alone to solve the heating and cooling issues but I am tempted to replace the Rheem unit as well.

    I am also confused about the above options. Why wouldn't the more expensive units have higher btu ratings?

  12. #25
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    Just because one car is more expensive then another, doesn't mean it gets better gas milage then the cheaper one.
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  13. #26
    That's true. But hopefully the more expensive car has features that you'll enjoy such as sunroof, leather seats, navigation, etc.

    Why would I want to choose the XL15i or XL16i over the XR13?

    Thanks!

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