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by • October 30, 2015 • HVAC & DehumidificationComments (6)4697

3 Head Mitsubishi Ductless Install Review

My business partner Eric Rauser, AIA designed this amazing Perfect Wall house and it’s the first house I’ve built that’s completely free of duct work!  (See this older blog post for more on Perfect Wall) The house is incredibly efficient with a blanket of exterior rigid foam on all sides (and the roof), a radiant barrier metal skin, and a super tight envelope… it’s really a perfect house to go ductless.

Here's the porch brackets with insulation going behind them.

Here’s the porch brackets with insulation going behind them.

All reading for siding. Rainscreen 1x4 battens installed over foam.

All ready for siding. Rainscreen 1×4 battens installed over thick exterior foam.

Now that you’ve seen some pictures of the house under construction, here’s the completed house.  This is a rather small 2 bed, 2 bath 1700 sf house but this Mitsubishi 3 head system has worked perfectly in the past 2 years since we’ve finished this home.

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Master Bedroom has one head above the closet

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Living Room/Kitchen has one head… kitchen is to the right in this photo.

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Head is above the louver door into the pantry/laundry room.

Study which is opposite the Living/Kitchen has one head too. This room doubles as a guest bedroom.

Study which is opposite the Living/Kitchen has one head too. This room doubles as a guest bedroom.

 

All three heads are tied to one outdoor unit.  Each head has it’s own controller, yet with the Mitsubishi VRF compressor they all can draw what they need from the single outside unit to cool/heat that particular space.  (remember they all need to heat or cool at the same time, you can’t heat up and cool downstairs)  Pretty terrific if you ask me!  If you are considering one of these units, I would highly recommend them.  Build a tightly sealed, well insulated box, and forgo the ductwork!  More info at http://www.mehvac.com/

Perfect Wall house in Austin, TX Designed by Rauser Architecture built by Risinger Homes

Perfect Wall house in Austin, TX Designed by Rauser Architecture built by Risinger Homes

-Matt Risinger

Risinger Homes in Austin, TX

Visit my Blog at www.MattRisinger.com

Risinger Homes is a custom builder and whole house remodeling contractor that specializes in Architect driven and fine craftsmanship work. We utilize an in-house carpentry staff and the latest building science research to build dramatically more efficient, healthy and durable homes.

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  • Built-Rite

    I see a hood exhaust. Is there exhaust for the kitchen and bathrooms? ERV or HRV? I’m assuming there is still at least some duct work for fresh air, just not used as conditioning. What’s the flue on the roof?

    • We have a standard hood in the kitchen then a Panasonic ERV in the Laundry room. The flue is SS for the wood burning stove.

  • Sam H.

    Would you still recommend these for larger homes? We’re building a 3300 sq. ft. home in the PNW, and i’ve been intrigued by your discussions of the mini-split systems.

    • Yes Absolutely. However, you will need a designer who takes into account air flow plus loads from the house…how efficient your envelope on the house is (air sealing + insulation-glazing)

      Matt

  • David Lang

    how do you handle ventilation requirements in such a tight house without ducts?

    I’m looking to build in the Los Angeles area and there’s a requirement to have a system able to do 3ACH (or 6ACH if I don’t have enough opening windows)

    • Matt Risinger

      WOW, THAT’S A HIGH REQUIREMENT 3ACH! IN THIS HOUSE I USED A SMALL PANASONIC ERV. IF YOU NEEDED A HIGHER VENTILATION RATE YOU’D WANT TO DO A STAND-ALONE ERV. MATT