Results 1 to 6 of 6
  1. #1
    I have a 5 ton 12 seer trane unit with a power bill around $280-$340 a month. With my last power bill being the highest yet at $370 of the 12 year of me living in my house. I was thinking about having someone one install a 5 ton trane XL19i with a varible speed air handle. I was wanting to know how much money do you think my power bill should go down and if it really worth intalling such a high seer unit.

    Thank you for anwering my question it will help me alot in me chosing a unit. Jason

  2. #2
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,296
    Originally posted by master air
    I have a 5 ton 12 seer trane unit with a power bill around $280-$340 a month. With my last power bill being the highest yet at $370 of the 12 year of me living in my house.

    I was thinking about having someone one install a 5 ton trane XL19i with a varible speed air handler.

    I was wanting to know how much money do you think my power bill should go down and if it really worth intalling such a high seer unit.

    Thank you for anwering my question it will help me alot in me chosing a unit. Jason
    12 SEER at _$ 340 / month
    17 SEER at ~$ 285+/ month
    with Cooling Energy Co$t being < 45% of the total.

    But who really knows
    unless all the component energy co$t
    can be more well defined.


    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  3. #3
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    have you checked all the items which can cause energy waste?
    poor insulation, esp ceiling
    poor insulation of ducts
    duct joints apart
    box | duct joints, seams, holes not sealed
    oversized unit
    no shading
    no insulation around slab perimeter

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,171
    As Cem, has suggested, improve your homes envelope first, then have a new load calc done to see what size system you need.

    A 14 seer 3.5 ton cost less , and uses less then a 19 seer 5 ton.

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    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,296

    Approx. Cooling Energy $avings

    SEER Upgrade
    Evaluation METHOD
    (Adjust to $uit your $ituation)

    SEER 12 vs 17 = ~71% as much energy
    __5 tons
    ~10 hours /day
    ~50 kw-Hr / day
    _30 days
    1500 kW-Hr/ month
    $0.10 $ / kW-Hr
    $150.00 Monthly Cooling Cost
    _______

    $44.12 Savings per month at 29% (100- 71)
    __5 months
    $220.59 per year

    If the 5-ton A/C unit runs for
    10 hours each day for 150 days (30 days x 5 months),
    your annual cooling cost savings would be ~$220.

    It seems like A/C might be 45% to 62% of total electric bill. At 14 hours per day run time, cooling cost would be $210 per month, and
    savings would be $61 per month for about 5 months (MAXimum, unless you are in Phoenix) per year.

    Total annual cooling hours in the VERY Simplified Example
    above is 1,500 hours
    which may vary significantly due to
    weather in your specific area
    and A/C unit performance.

    System price ~$10,000 simply to have
    more efficient unit ... Pay-back 45 years.

    More realistic comparison,
    system price greater than the
    cost of a 12 SEER replacement:
    Say $3,000 is approximate cost
    for upgrade from 12 to 17 SEER.
    Pay-Back = 13.6 years.

    Obviously, other A/C performance and building envelope enhancements should be evaluated
    prior to equipment SEER upgrade by itself
    as others will comment here.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  6. #6
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,998
    Originally posted by cem-bsee
    have you checked all the items which can cause energy waste?
    poor insulation, esp ceiling
    poor insulation of ducts
    duct joints apart
    box | duct joints, seams, holes not sealed
    oversized unit
    no shading
    no insulation around slab perimeter
    The above is excellent advice.
    Have an energy audit done and make cost-effective investments in reducing the heatgain and heatloss of your home.

    Then have an accurate manual J done and make certain that the size equipment you have installed is putting out its rated Btu/hr during your normal temperature and humidity operating conditions.

    A lot of the larger units don't have the adequate airflow and enough heatload on the evaporator coil. A fair percentage of residential 5-ton systems are only removing 3.5 to 4-ton of heat from the home's conditioned space.

    Do the right things in the proper sequence and you might save yourself a ton on needless utility expenditures. Every county in America should have an energy audit police force checking out ecvery jome and commercial building, and especially government buildings! Can you say, Amen to that?

    http://www.udarrell.com/air-conditio...ator-coil.html






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