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  1. #1
    Join Date
    Aug 2010
    Posts
    6

    Confused Mitsubishi 12,000 btu with hyper heat (mszfe12na)

    First post here it goes!

    Finishing a Bonus room for a customer. 16X24 room dims with a 4 ft knee wall 30 degree angle ceiling with a max height of 8 ft. The room is spray foam insulated. i advised customer Mitsubishi 12,000 btu with hyper heat (mszfe12na) should be sufficient for this room size and how well it is insulated. However they had H-vac guy out to quote and he says it needs a Mitsubishi 22,000 btu mini split!!! i thinks it a little over kill... any advise??

    climate is Northern Ohio...

    give me some advise experts.

  2. #2
    Join Date
    Sep 2007
    Location
    Tucson AZ
    Posts
    19
    That's easy, run a heat load calculation and you'll know who is correct!

  3. #3
    Join Date
    Aug 2010
    Posts
    6

    Heat load

    i did and came up with right around 11,000 btu's. Just wanted to make sure someone else could confirm this since i am no HVAC Professional.

  4. #4
    Join Date
    May 2000
    Location
    Colorado flatland native
    Posts
    15,067
    I would listen to the hvac professional. How cold does it get in O-Hi-O?
    My doctor gave me six months to live, but when I couldn't pay the bill he gave me six months more.
    Walter Matthau

  5. #5
    Join Date
    May 2008
    Location
    Portland, OR
    Posts
    236
    Was your heat load 11k cooling or 11k heating?

    The contractor may have recommended a larger unit for the purposes of heating the room instead of cooling.

    Great system by the way!

  6. #6
    Join Date
    Aug 2010
    Posts
    6
    yeah I'm sorry.... that was for cooling (with fiberglass insulation) .... i can i get some help for heating?

  7. #7
    Join Date
    May 2008
    Location
    Portland, OR
    Posts
    236
    16x24, 8ft ceiling
    How many, what size and what type of windows?
    What's the R-value of the insulation in the ceiling and walls?
    What kind of floor is it (crawl-space, cement, basement)?
    What kind of flooring (wood, carpet)?
    What's the zip code?

    With this information I can run a heat load for you. =)

  8. #8
    Join Date
    Jan 2004
    Location
    Here and there
    Posts
    4,808
    Fujitsu I might do A 22,000 as well. With the inverter varaible capacity 9900-27300 I wouldnt worry about being over sized in cooling.
    i belong to peta ... people eating tasty animals. all my opinions are just mine.

  9. #9
    Join Date
    Aug 2010
    Posts
    6
    24x16
    No windows
    walls r-15
    ceiling r-50
    insulated garage below
    carpet on the floor
    zip 44883

  10. #10
    Join Date
    May 2008
    Location
    Portland, OR
    Posts
    236
    I'm getting 11k heating, 6.6k cooling.

    The colder it gets outside, the less efficiently the mini-split will work. Oversizing the system will compensate for the up to 30% loss in capacity when it gets cold.

    I agree with the contractor. A 22k system would be the best option. A 12k would work most of the time, but may not produce enough warm air on the coldest days.

  11. #11
    Join Date
    Aug 2010
    Posts
    6
    That's why i was thinking the mszfe12na with muzfe12na with the hyper heat holding efficiency down to the single digits.....

    Maybe just go with the bigger size then not disappointed!

  12. #12
    Join Date
    Aug 2010
    Posts
    6
    Quote Originally Posted by jpb2 View Post
    Fujitsu I might do A 22,000 as well. With the inverter varaible capacity 9900-27300 I wouldnt worry about being over sized in cooling.
    jpb2 do you have a model number so i can show my customer a variable speed mini split?

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