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How many ductless head units do I need?

steamheatnewbsteamheatnewb Member Posts: 29
Hello - I am looking to install a ductless mini split cooling system in my house (1100sf, 1 floor, 5 room, 2bd).

Do I really need a head unit in each room to cool the place in the summer (I live in New England)?

So far have been getting quotes ~$ for 5 head units totaling 39k BTU. Does this sound like over kill or could I get away with a head unit in each bedroom and a head unit in the living room which flows into the dining room? What is a typical setup like this?

Thank you

Comments

  • pecmsgpecmsg Member Posts: 1,450
    1100 Sq Ft shouldn't need 40K BTU's. 12 - 16K tops.
    No you don't need a head in each room and in your situation its impractical.
    You can do your own Manual "J" Calculation here https://www.loadcalc.net/.
    Look into a small ducted unit and pick 3 rooms. The cool dry air will find its wa
  • steamheatnewbsteamheatnewb Member Posts: 29
    pecmsg said:

    1100 Sq Ft shouldn't need 40K BTU's. 12 - 16K tops.
    No you don't need a head in each room and in your situation its impractical.
    You can do your own Manual "J" Calculation here https://www.loadcalc.net/.
    Look into a small ducted unit and pick 3 rooms. The cool dry air will find its wa

    Thank you! Out of curiosity, for that size system with 3 heads, how much do you think it should cost for the install? Assuming just installing the unit and no additional electrical work is needed.
  • STEAM DOCTORSTEAM DOCTOR Member Posts: 1,166
    We don't discuss price on this forum. Too many variables.....
    Erin Holohan Haskell
  • pecmsgpecmsg Member Posts: 1,450
    > @steamheatnewb said:
    > (Quote)
    > Thank you! Out of curiosity, for that size system with 3 heads, how much do you think it should cost for the install? Assuming just installing the unit and no additional electrical work is needed.
    There’s additional electrical needed!

    What I charge out here is different then where you are.
    Do not shop by price, choose the installing contractor carefully and give them what the want.
  • EdTheHeaterManEdTheHeaterMan Member Posts: 630
    edited May 14
    You can find multi-head outdoor units and put a standard wall unit in the main living area. Then perhaps a small ducted head in a closet between 2 rooms. This will get you down to 3 heads total.

    be sure the ducted head can be installed vertically so condensate will drain properly. Not all brands will do this. I have had success with the Fujitsu brand, but there may be others.

    read Drain Location specification carefully when installing vertically.


    This might be your layout.

    You may use 3 indoor units or increase the size of A and delete C and you will only need 2 indoor units. Now you can have something closer the size you need like 25,000 to 33,000 BTU total... (your actual load calculation will determine the proper minimum size)
    steamheatnewb
  • HVACNUTHVACNUT Member Posts: 3,412
    Are you committed to ductless? Why not CAC?
  • steamheatnewbsteamheatnewb Member Posts: 29

    You can find multi-head outdoor units and put a standard wall unit in the main living area. Then perhaps a small ducted head in a closet between 2 rooms. This will get you down to 3 heads total.

    be sure the ducted head can be installed vertically so condensate will drain properly. Not all brands will do this. I have had success with the Fujitsu brand, but there may be others.

    read Drain Location specification carefully when installing vertically.


    This might be your layout.

    You may use 3 indoor units or increase the size of A and delete C and you will only need 2 indoor units. Now you can have something closer the size you need like 25,000 to 33,000 BTU total... (your actual load calculation will determine the proper minimum size)

    Thank you this is great! I haven't looked into duct mini splits too much but I do have a full stand up attic above my condo with full access so it could even work for me to install some duct units between rooms.

    This is one unit I saw online that could be similar to what you drew out?
    https://www.acwholesalers.com/LG-LMU36CHV-2-LDN097HV4-LDN187HV4-3-PREMTC/p57535.html
  • HVACNUTHVACNUT Member Posts: 3,412
    You can certainly do a mini A/H ducted to a few rooms from the attic. Some cassettes even let you run a short duct.

    The vertical duct thing looks like a mess IMO. There's too many other less invasive options.
  • SuperTechSuperTech Member Posts: 1,344
    I'd install standard ducted A/C in the attic if you have sufficient space. Regular ducted A/C systems have several advantages in my opinion. Then tend to stay cleaner, are much easier to clean and service. And parts are more accessible and the systems are easier to work on.

    Mini splits are great for a lot of applications, but I think a properly designed and installed ducted system is the best option and the first thing to consider for whole house cooling systems.
  • ratioratio Member Posts: 2,489
    Several (most?) mini split mfgrs have air handler 'heads', they operate very much like a standard air handler. A few make an adapter board to connect a mini split outdoor unit to a standard indoor unit, see page 65 of this catalog for instance.

    NB: I was thinking about getting this kit for a house I manage, until I heard that it doesn't work with their HP units. And now I can't seem to find it on their website, even though it's still in their catalog. YMMV.

  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 7,091
    @steamheatnewb

    I am in NE and my 1000Ft ranch is all brick and stone no wall insulation at all. I have 2 1/2 tons Manual J was between 2 & 2 1/2 and 2 would have probably done it so the guy with 40K and five heads needs his head examined.

    A rough rule of thumb in NE is the cooling load is 1/2 the heating load.

    You need an accurate load done first
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