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  1. #1
    Join Date
    Jun 2011
    Location
    North Dakota
    Posts
    38

    Single or Two Stage Heat Pump in ND

    My wife and I purchased our house last October and planned to replace the original HVAC system from 1994 next year. However, that changed after we had our furnace inspected and serviced last week. The tech told us the inducer motor was going bad and should be replaced. Instead of putting $400-500 into it, we decided to upgrade now.

    Original Furnace: Heil 9000, model # NULSO75BG04, propane
    Original AC: American Standard Allegiance 10 - model # 7A0030A100A0

    Here are a few details of our place:
    - Located in central North Dakota
    - 4408 finished sq ft (1032 top floor/loft, 1688 main floor, 1688 basement)
    - Built in 1994 using Enercept SIPS (vaulted ceilings, no attic)
    - PerfectAire Model 8100 Fresh Air Exchanger
    - Propane: $1.62 average last year
    - Electric: Facility charge of $14/mo - First 1000 kWh $.0777, Next 1000 kWh $.0690, $.0600 after that

    I went to the Degree Days website and downloaded the following info. I ran the report for the last two years since this past winter was pretty mild and the previous one was more typical of a ND winter.

    ..................HDD.....CDD
    10/1/2010.......557.....20
    11/1/2010.......1126....0
    12/1/2010.......1686....0
    1/1/2011........1864....0
    2/1/2011........1498....0
    3/1/2011........1437....0
    4/1/2011........758.....1
    5/1/2011........399.....6
    6/1/2011........118.....95
    7/1/2011........16......270
    8/1/2011........46......175
    9/1/2011........276.....66
    Total...........9781....633

    10/1/2011.......519.....28
    11/1/2011.......992.....0
    12/1/2011.......1255....0
    1/1/2012........1370....0
    2/1/2012........1253....0
    3/1/2012........748.....10
    4/1/2012........562.....11
    5/1/2012........272.....51
    6/1/2012........79......171
    7/1/2012........14......325
    8/1/2012........104.....171
    9/1/2012........288.....84
    Total...........7456.....851

    ---------------------------------------------

    Last Tuesday and Wednesday, I called five area companies (Coleman, Lennox, Ruud, Trane, York) and as of today, I have only heard back from the Trane and Lennox dealers (the Ruud dealer that I used to service my old system hasn't even called me back yet!). I received quotes from both and feel more comfortable with the Lennox dealer.

    Below are the quotes exactly as they were written.

    Option 1
    Lennox SLP98UH090XV48C 98% Modulating Variable Speed Furnace with LP Kit
    Lennox XP17-036-230 Single Stage Heat Pump
    Lennox Cased A-Coil
    Lennox Healthy Climate Air Filter and Cabinet
    Lineset, Whip, Pad & Stand
    PVC for Combustion Air Intake and Exhaust
    Condensate Drain Material
    Lennox icomfort Wi-Fi Thermostat
    Supply and Return Air Plenums
    Installed Price - $$$$$

    Option 2
    Lennox SLP98UH090XV48C 98% Modulating Variable Speed Furnace with LP Kit
    Lennox XP16-036-230 Single Stage Heat Pump
    Relay kit to make compatible with icomfort thermostat (price charged separately when released)
    Everything else the same
    Installed Price - About 5% higher than Option 1 (plus relay kit price when released)

    Option 3
    Lennox SLP98UH090XV48C 98% Modulating Variable Speed Furnace with LP Kit
    Lennox XP21-036-230 Single Stage Heat Pump
    Everything else the same
    Installed Price - About 25% higher than Option 1


    We plan to be in our house for the next 25-30 years so we'd like a very efficient, comfortable system. Based on the quotes, it seems like Option 1 or 2 would be the way to go.

    Am I better off going with the single or two stage heat pump? Or doesn't it make much difference?

    Any advice/suggestions/recommendations are gladly accepted.

    Dave

  2. #2
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,482
    I would not go with an air to air HP in N.D. If you can wait, I would install a split geo-thermal system.

    IMHO........

  3. #3
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,398
    Geo would be great if affordable. Otherwise I'd sure have an air source if I had LP heat.

    Look at all the numbers. In your area, concentrate on heating performance.

    1st option: HSPF for that unit is 8.50, pretty sorry for such a high end heat pump.

    2nd option: HSPF is 7.70, the minimum allowed by law. Even many builder 13 SEER units do better than that.

    3rd option: HSPF of 9.50, finally some decent heating performance. But it should be for what you'll pay for that unit. And paying for SEER that won't save you much.

    Keep looking...

    Rheem/Ruud RPNL-037 with their Mod, HSPF 9.00 and it is a deluxe 13 SEER, drastically less bucks than the XP16 & XP17. Just an example.

  4. #4
    Join Date
    Jan 2002
    Location
    East Grand Forks, MN
    Posts
    1,373
    Dave,

    I'm wondering, was there a heat load calc done for your house? That would be my first step before determining sizing of equipment, type of equipment, and duct sizing.
    I prefer two stage equipment whenever possible, but for me it depends on duct system and the heat load calc.

    Don't believe those that say HP can't work in the Northern States and be efficient and last.

    Best of luck.

  5. #5
    Join Date
    Feb 2007
    Location
    Sulphur La.
    Posts
    179
    I think the model heat pumps you listed are all two stage.

  6. #6
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
    Posts
    3,350
    Quote Originally Posted by Tjune54 View Post
    I think the model heat pumps you listed are all two stage.
    All but the XP17.

    What is the exact coil model number they intend to install, if you know it? That will help tell you the matchup ratings for your particular combination, although BaldLoonie gave you the typical HSPF ratings of each HP model. Could vary slightly depending on which indoor coil is installed.

  7. #7
    Join Date
    Jun 2011
    Location
    North Dakota
    Posts
    38
    Quote Originally Posted by RyanHughes View Post
    All but the XP17.

    What is the exact coil model number they intend to install, if you know it? That will help tell you the matchup ratings for your particular combination, although BaldLoonie gave you the typical HSPF ratings of each HP model. Could vary slightly depending on which indoor coil is installed.
    I've requested the model number from the dealer.

  8. #8
    Join Date
    Jun 2011
    Location
    North Dakota
    Posts
    38
    Quote Originally Posted by BaldLoonie View Post

    Keep looking...

    Keep looking...

    Rheem/Ruud RPNL-037 with their Mod, HSPF 9.00 and it is a deluxe 13 SEER, drastically less bucks than the XP16 & XP17. Just an example.
    I'm trying. Unfortunately my calls haven't been returned.

    I did get two quotes from the Trane rep for a XV95/XL16i and XV95/XL15i but they were about the same as Option 3.

  9. #9
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,482
    Did I read your model #'s correctly regarding the original equipment sizes?

    The furnace is a 75,000 btu and the A/C is a 2.5 ton?

    I can understand increasing the btus of the HP (for the heating btus), but why enlarge the furnace btus?

  10. #10
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,398
    Bigger is better, George. Hadn't you learned that by now! If 75K 90% did the job all these years, then 90K 98% HAS to be better Going to a 3 ton pump over a 2.5 ton lowers the balance point a hair but not by what most would think.

    I wouldn't want a 16i Trane, heating capacity is weak. Rather have the 15i, it gets 9 HSPF with the right coil. Sure beats the 7.7 of the Lennox XP16

  11. #11
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,482
    B.L.

    Dave........I just re-read ur original thread and you stated that the serviceman said ur inducer motor was going bad?

    Is it making noises or getting too hot? What did he say was the problem with it?

  12. #12
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    3,958
    With the cost of propane vs. electric I'd forget the furnace and use electric for backup/aux heat. Your electric is cheap compared to propane costs. No buying an expensive furnace and you can run the heat pump with electric backup at the same time.

  13. #13
    Join Date
    Jun 2011
    Location
    North Dakota
    Posts
    38
    Quote Originally Posted by Dave2425 View Post
    I'm trying. Unfortunately my calls haven't been returned.

    I did get two quotes from the Trane rep for a XV95/XL16i and XV95/XL15i but they were about the same as Option 3.
    The Trane dealer followed up today with a quote for a XC95m/XL20i system. It was about 65% higher than option 1, 33% higher than Option 3.

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