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  1. #1
    Join Date
    Feb 2007
    Location
    Northern Ontario
    Posts
    128

    Cool DX geothermal what do you think

    licensed refrigeration guy here installed a bunch of pump and dump geo units with lots of success. I am building my own house and was thinking out options for heating /cooling i was looking at my first direct expansion geothermal unit. My lot is difficult to dig so the smaller loop footprint would be a bonus and all equipment / install is at my cost . What do you guys think for best system. My house is in northern ontario canada and will be 2000 sq feet. Thanks alot
    You miss 100% of the shots you don't take...

  2. #2
    Join Date
    Feb 2009
    Location
    Portland OR
    Posts
    1,994
    I have never done a DX so take my opinion as nothing more than an opinion. I do not see how putting copper in the ground can be a good thing over time. I have heard from associates that these do not last much longer than 10 years due to the copper lines falling apart over time. At that point you have then leaked refrigerant into the ground and have to redrill everything. I prefer do it once and do it right. The copper has a 5 year warranty on the pipe and is much thicker than regular copper but HDPE pipe has 55 year warranty so which would you trust under the ground?

    Also Because of the extreme heat transfer of straight refrigerant i have heard that the ground can start to freeze and expand and contract causing a rolling effect of the ground around it. Also after 3-5 years of freezing ground, now the earth is no longer touching your pipe and the efficiency drops fast.

    In short, first 1-5 years can be amazing efficiency and no issues
    5+ years expect efficiency to drop off each year and many possibilities of pipes breaking underground and re-excavating.

  3. #3
    Join Date
    Jan 2005
    Location
    Emerald Coast
    Posts
    937
    .
    Check out these guys:http://www.earthlinked.com/

    ..
    Do not attempt vast projects with
    half vast experience and ideas.
    ...

  4. #4
    Join Date
    Aug 2011
    Location
    Eastern Shore, MD
    Posts
    798
    I just finished my 6th DX installer for the month.(technically begining july 1st)...easy, trouble free, awesome. I wont do a water source hp unless i have to.
    Last edited by Gross; 08-05-2011 at 02:48 PM. Reason: clarification

  5. #5
    Join Date
    Aug 2011
    Location
    Eastern Shore, MD
    Posts
    798
    Quote Originally Posted by SkyHeating View Post
    I have never done a DX so take my opinion as nothing more than an opinion. I do not see how putting copper in the ground can be a good thing over time. I have heard from associates that these do not last much longer than 10 years due to the copper lines falling apart over time. At that point you have then leaked refrigerant into the ground and have to redrill everything. I prefer do it once and do it right. The copper has a 5 year warranty on the pipe and is much thicker than regular copper but HDPE pipe has 55 year warranty so which would you trust under the ground?

    Also Because of the extreme heat transfer of straight refrigerant i have heard that the ground can start to freeze and expand and contract causing a rolling effect of the ground around it. Also after 3-5 years of freezing ground, now the earth is no longer touching your pipe and the efficiency drops fast.

    In short, first 1-5 years can be amazing efficiency and no issues
    5+ years expect efficiency to drop off each year and many possibilities of pipes breaking underground and re-excavating.

    Actually, none of that is true. If copper breaks down in the ground...why is there copper considering it comes from the ground. Dirt, for the most part, is reducing....it adds electrons to the copper, instead of removing it.....

    sounds like what you've "heard" is a well driller or hvac contractor well vested in vertical boring. DX systems existed before water source systems, have an EXTREMELY low failure rate ( due mostly to the fact they dont over complicate them with electronics....) as far as freezing the ground...its grouted...thermal grout wont freeze bc it will disperse energy in as even a fashion as it can be expected to. The only time you'd experience any thing like that is if the system was grossly undersized ( they are designed for a 12/12 run/rest cycle) water source has its applications....but dx definately does as well.....problems occur when you get an ignorant contractor...as with anything

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