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  1. #1
    Join Date
    Jan 2015
    Location
    Iowa
    Posts
    1,638
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    Mini-Split Winter Heating

    Good morning have a Mini-Split question for you. My church has a camp and has a year-round building. It has 10 PTEC's one for each sleeping room. They are all 21 years old.

    They are 9000 cooling with 3.5Kw (12,000) electric heating coil. It is in the upper midwest we can stay well below "zero" for weeks in the winter.

    They have several PTEC units that are getting pretty unreliable. They would like to move to mini-splits if it is feasable.

    I typically do not do much with mini-splits and concerned there will not be enough heat available using an air cooled mini-split unit. So my question is: How well do these newer mini-split work with respect to heating in the winter below zero. There is no other heat available

    Thanks for your replies

  2. #2
    Join Date
    Jul 2003
    Location
    lvl ky
    Posts
    268
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    none will work great at zero or below, but the mitsubishis are incredible even at single digit odt.

  3. #3
    Join Date
    Jan 2015
    Location
    Iowa
    Posts
    1,638
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    Thread Starter
    Thank you, I know the correct term for these units are PTAC's but the one I have beenasked to replace are Trane PTEC's

  4. #4
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,679
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    Install the Mini Splits. Much higher efficiency. Each area should have some type of back up heat anyway.

  5. #5
    Join Date
    Mar 2017
    Posts
    5
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    If you splurge for the Carrier Performance Series over Comfort Ductless Units (Honestly only like $200-300 difference per system in our area) they are reliable down to -21 degrees for heating.

  6. #6
    Join Date
    Jan 2015
    Location
    Iowa
    Posts
    1,638
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    Thread Starter
    Thank you. There is no water in the sleeping rooms so nothing to freeze. Typically the heat is left off in sleeping rooms until occupied. I have seen the temperatures in these rooms drop to where you can see your breath (so 40"s). The floor below the sleeping rooms and the adjacent shower rooms are heated via 3 LP gas furnaces plus one LP gas fireplace. So there is other heat in the building but not directly connected to the sleeping rooms.

    They lost power one winter and had some freeze damage. Since that time a Cat Motor/Generator set has been added to prevent that problem again. What I did not want to have happen is to install a mini-split heat pump and in the winter could not keep the sleeping rooms above 50F or 60F. They have been given a Mitsubishi unit (MSZ-GL09NA, 9000 cooling, 11000 heating) and asked if I would install it to see how well it works. I just question waiting until Decemebr to prove or disprove there is adequate heating

    Thanks Again

  7. #7
    Join Date
    Jan 2015
    Location
    Iowa
    Posts
    1,638
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    Thread Starter
    Thank you nice to know about the Carrier units

  8. #8
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,679
    Post Likes
    any heat pump will need quite a bit of run time to recover in the winter from a 40° start.

  9. Likes Juan Madera liked this post
  10. #9
    Join Date
    Jan 2015
    Location
    Iowa
    Posts
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    Thread Starter
    Understood, and will provide that feedback to them, Thank you

  11. #10
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    3,462
    Post Likes
    Mitsubishi hyperheat units work down to -17degrees (or maybe it is -13) with essentially full capacity. They need to be mounted on pump ups and require a base pan heater in cold applications. Never had an application problem with a properly sized system

    Sent from my SM-N920V using Tapatalk
    ...

  12. #11
    Join Date
    Jun 2012
    Location
    Northern NV
    Posts
    1,983
    Post Likes
    I am constantly amazed at the heating performance of the off brand two headed mini split I installed in a rental I own. Renter is almost gushy in praise over the hydronic BB that was the primary heat source. Left the BB functional, but has never been used all winter here in NW NV

  13. #12
    Join Date
    Mar 2014
    Location
    Altoona, Pennsylvania
    Posts
    406
    Post Likes
    I install the fujitsu brand. They can go down to -15F if you install the high heat models. I never had a customer complain yet. Matter of fact I'm bidding one right now. I did there neighbors last fall and they seen how well it worked.

  14. #13
    Join Date
    Feb 2014
    Posts
    13
    Post Likes
    Was just at the Mitsubishi service course yesterday, hyperheats work at 100% capacity until around -15c and will still heat but at lower efficiency until -25c


    Sent from my iPhone using Tapatalk

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