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  1. #1
    Join Date
    Jan 2010
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    Replace old unit or not?

    I have a home built in the early 70's with a General Electric Central unit. The house is total electric, and the heater has three sets of coils, two are primary, and the last is called auxillary on the wiring diagram. I have calculated from my electric bills for the past year, that I use around 7600 kw of power for heating and cooling. I took the fall and spring months as normal useage, then deducted the excess over that for the remaining 9 or ten months. I would like to install a new 20 seer heat pump with a 3 ton a/c. I have a 1500 square foot home. My current unit is running fine, just know it won't last forever. I calculated I am using around $485 bucks a year for heating and cooling, and don't know if I will save much more than that. Do I run my unit to failure, or replace it?

    Thanks for any replies.

  2. #2
    Join Date
    Sep 2002
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    For heating, pay attention to hspf, not SEER.

    A heatpump upgrade will significantly reduce electricity consumption, but do what you can to reduce heat loss in the first place. (Attic insulation, draft proofing)

    Since the equipment is over 30 years old, replacement is advisable.
    I've discovered a natural law - everything gets progressively worse. Things only break down and become depleted. Life isn't worth living and everything is going to hell.

    Death is the messiah. Everything else is irrelevant and arbitrary.

  3. #3
    Join Date
    Feb 2003
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    pittsburgh,pa
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    If the unit is original to the home , you may be on borrowed time if it has not been maintained over the years. A new heatpump sounds like it would fit the bill. You will need to have a load calc and system survey done to make sure you get the proper size equipment.
    "Can't see it from my house"

  4. #4
    Join Date
    Jan 2010
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    thanks

    Quote Originally Posted by jwiehagen76 View Post
    If the unit is original to the home , you may be on borrowed time if it has not been maintained over the years. A new heatpump sounds like it would fit the bill. You will need to have a load calc and system survey done to make sure you get the proper size equipment.
    I have replaced all of the windows on the home with triple pane, low e glass. I have blown in insulation on top of the existing to achieve around 18 inches. The unit has been maintained, but I would like to know what a new trane would cost to run per month. I am on average billing paying $135.00 per month, year round. The age of the unit is what concerns me. I might just run it to failure, since the new units only have a life expectancy of 15 years.

  5. #5
    Join Date
    Jan 2004
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    If your only using 7500KWs a year for both heating and cooling.

    You won't get a payback/ROI from a 20 SEER. Probably better off with a 14 or 15 SEER heat pump.
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  6. #6
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    As far as I'm concerned (based on performance data, not practical experience), 16+ SEER = smoke and mirrors.
    I've discovered a natural law - everything gets progressively worse. Things only break down and become depleted. Life isn't worth living and everything is going to hell.

    Death is the messiah. Everything else is irrelevant and arbitrary.

  7. #7
    Join Date
    Jan 2004
    Location
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    In average or above average humid areas, Thay make a big difference.

    I haven pulled 13 SSER and replace it with 16 or beter SEER yet.
    But I have pulled 12 SEER's with good EER ratings. And those customers saw a good increase in both comfort and a reduced cooling bill.
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