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#3426728 - 10/29/13 08:46 PM ductless AC ???
fishboy1
16 Point


Registered: 01/13/03
Posts: 10524
Loc: Warren Co

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I have heard some good things about the Ductless Mini Split systems. Most of what I know are for smaller installs and adding Ac to additions or bonus rooms.

How are they for a new construction/whole house application?
1300sf Basement + 1300sf 1st floor with 1/2 open to cathedral ceiling + a 600sf half loft second floor? Log construction with open beam ceilings so running ducts will be difficult.

Thanks!
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#3426734 - 10/29/13 08:50 PM Re: ductless AC ??? [Re: fishboy1]
gator-n-buck
WAFL
18 Point


Registered: 10/22/08
Posts: 20270
Loc: Knox, TN / Palatka, FL

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Never heard of ductless AC.... Should be cool to see the response... \:\)
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#3426776 - 10/29/13 09:06 PM Re: ductless AC ??? [Re: gator-n-buck]
leader
16 Point


Registered: 08/10/06
Posts: 10576
Loc: Knox

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I think it would have all kinds of trouble keeping it cool outside of the room the unit was in....
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#3426791 - 10/29/13 09:13 PM Re: ductless AC ??? [Re: leader]
fishboy1
16 Point


Registered: 01/13/03
Posts: 10524
Loc: Warren Co

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Compressor is outside, a thin copper line and an electric wire are all you run to the unit on the wall inside. One wall unit per zone. Seer rating is 18 or better on most.
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#3426798 - 10/29/13 09:17 PM Re: ductless AC ??? [Re: fishboy1]
Inkstainz
14 Point


Registered: 08/23/12
Posts: 7596
Loc: Memphis, Tennessee

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Man I've put quite a few of them in. Mostly in commercial areas and mostly in computer rooms or labs that need to be at a correct temperature. That being said, something like a liebert unit could work for a whole house but I doubt you could do it ductless. They basically build the floor up sometimes a foot (which sucks running the copper to when you have to crawl around under it) up to 24 inches is the biggest I've dealt with. They basically just pump a bunch of cold air under the floor and have a few "grill" tiles that allow the cold air to go up through it. I've seen these things cool server rooms that have a TON of servers. I'm not sure how you could make this application work for you but I believe that you could get one big enough to take care of it probably. I think you would be happier using a regular central air system because honestly they are just basically more efficient window units.
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#3426827 - 10/29/13 09:29 PM Re: ductless AC ??? [Re: Inkstainz]
KPH
10 Point


Registered: 08/06/05
Posts: 3476
Loc: Hendersonville Tenn

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Inkstainz I don't think he is talking about Liebert witch is designed for server rooms not houses.
That being said I have never liked working on the ductless types.
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#3426841 - 10/29/13 09:34 PM Re: ductless AC ??? [Re: KPH]
Super8
8 Point


Registered: 07/15/12
Posts: 1452
Loc: USofA

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Multi-split unit is probably something you could do.
No duct work involved

http://www.trane.com/residential/products/ductless/multi-split/4mxw8
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#3426845 - 10/29/13 09:35 PM Re: ductless AC ??? [Re: KPH]
buckhorn40
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Registered: 07/03/06
Posts: 27627
Loc: Crossville

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If you are seriously thinking about ductless mini splits, make sure you consider Mitsubishi. They perfected the inverter technology before most other brands out there. Just a thought.
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#3427019 - 10/29/13 11:42 PM Re: ductless AC ??? [Re: fishboy1]
TAFKAP
14 Point


Registered: 11/06/09
Posts: 9430
Loc: Memphis

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 Originally Posted By: fishboy1
I have heard some good things about the Ductless Mini Split systems. Most of what I know are for smaller installs and adding Ac to additions or bonus rooms.

How are they for a new construction/whole house application?
1300sf Basement + 1300sf 1st floor with 1/2 open to cathedral ceiling + a 600sf half loft second floor? Log construction with open beam ceilings so running ducts will be difficult.

Thanks!


Absolutely not!

Go with (2) 2-ton units and split them that way. Under no circumstances will your house support one split-system. That vaulted ceiling is what'll do you in. Also, invest in an adjustable (and reversible) ceiling fan. Your utility bills will thank you.
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#3427061 - 10/30/13 02:54 AM Re: ductless AC ??? [Re: TAFKAP]
mike243
16 Point


Registered: 09/06/06
Posts: 11560
Loc: east tn

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I put some in over the years & they work fairly well but the ones 6-7 years ago didnt have a memory on the thermostat & if a power outage you had to hit the on button again.big open high ceilings are a challenge for any type of system.put the ductless system in for the upper floor & normal system for the main floor.l.nothing sez the whole house has to be ductless.just use it where it is needed.1 thing about the ductless is the ease of zone control.turn off a room & the unit slows the compressor down so no damage or wasted energy
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#3427062 - 10/30/13 02:56 AM Re: ductless AC ??? [Re: mike243]
mike243
16 Point


Registered: 09/06/06
Posts: 11560
Loc: east tn

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Also you have to run a drain to them
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#3427110 - 10/30/13 05:14 AM Re: ductless AC ??? [Re: KPH]
Inkstainz
14 Point


Registered: 08/23/12
Posts: 7596
Loc: Memphis, Tennessee

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 Originally Posted By: KPH
Inkstainz I don't think he is talking about Liebert witch is designed for server rooms not houses.
That being said I have never liked working on the ductless types.


Very well aware was just giving an example of what is out there.

I'm afraid that you will be unhappy with the ductless units and will be wishing that you had gone ducted.

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#3427111 - 10/30/13 05:15 AM Re: ductless AC ??? [Re: buckhorn40]
Inkstainz
14 Point


Registered: 08/23/12
Posts: 7596
Loc: Memphis, Tennessee

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 Originally Posted By: buckhorn40
If you are seriously thinking about ductless mini splits, make sure you consider Mitsubishi. They perfected the inverter technology before most other brands out there. Just a thought.


They do make some of the better ductless units.

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#3427130 - 10/30/13 05:51 AM Re: ductless AC ??? [Re: Inkstainz]
Crappie Luck Moderator
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Registered: 01/29/03
Posts: 60518
Loc: Smith Co.

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Is this the end of Duct Dynasty?
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#3427170 - 10/30/13 07:02 AM Re: ductless AC ??? [Re: Crappie Luck]
jb3
10 Point


Registered: 02/23/09
Posts: 4145
Loc: Burns, TN

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Mini-splits, if installed correctly could possibly be a great way to go. You will spend more money on the front end. Each room will have it's own indoor unit and you will only have one condenser located outside somewhere. Technology is great. Metro schools use these systems for classrooms. #1 thing is make sure you have a certified installer. I'm not sure how they would do in a room with a vaulted ceiling. I would probably suggest adding a ceiling fan in that room.

Mini-splits are all over Europe, South America, and Asia. I think Trane has a line of them. Mitsubishi, Daiken, and LG are probably the major players here in middle tn. If you have a floor plan, I can take a look and give you an idea of what your cost for equipment would be. When getting bids, make sure to let them know you are wanting "variable refrigerant flow" or VRF.

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#3427195 - 10/30/13 07:26 AM Re: ductless AC ??? [Re: jb3]
Steverino
6 Point


Registered: 07/01/13
Posts: 527
Loc: Giles Co

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I have a Fujitsu in our living room up here. It cools most of the downstairs during summer and doubles as a heat pump in the winter unless lower than 20 degrees. The kitchen and living room have a pass thru - the back bedroom cools via fan in the evening blowing from the living room. Heat seems to flow without a problem by itself. We use oil or wood stove if temps go 20 or below. I love it - costs less than window units to operate and does a nice job. However two issues - replacement filters are expensive and during summer the drain pipe can clog causing the wall unit to leak water - it also gets a mold on it - so they suggest you spray the inside of the wall unit with bleach / water once a month in the summer to prevent the mold. Getting it off is nasty as there is no easy access to it. Not sure if this is an issue with Mitsubishi units.

The TN house has a central air heat pump system so I won't be needing one there but if it didn't I'd put one or two of these in.

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