I currently have a 3 ton Trane that is on it's last legs. We have 2
mini split systems in this house already, one just for our bedroom and
one for an addition.
I am seriously thinking about ditching the ducted system and going for
a 3 head mini split for the rest of the house. I would really like to
get the duct work out of a 140 degree attic. This would also let me
zone out the 2 bedrooms we seldom use.
This is an open plan with the living room dining area and kitchen all
open. My thought was a compact cassette unit there and a wall head in
the other 2 bedrooms. The cassette will accommodate a 4" duct for the
master bath. That may need to be the 18KBTU model
Am I crazy?
On Sat, 27 Jul 2013 16:44:41 -0400, firstname.lastname@example.org wrote:
Depends on how comfortable you want to be. I've never been in a house
with "window units" that was really very comfortable. The other thing
to keep in mind is whether those scattered mini units will really save
you much money in operating costs IF you try for the same degree of
comfort as a whole house system. And how will the noise levels
compare, every non-central system I've seen is extremely noisy
compared to a central system. I tried a 18,000 BTU unit in the one
upstairs bedroom that was being used instead of the central upstairs
AC unit for the whole upstairs. it cost nearly as much to run that
one unit in the one room as it had been costing to cool the whole
upstairs and it was noisier and not really as comfortable overall.
You really did not do that right. A large unit like that needs a
large space and good air circulation. In my last house. I did then
entire downstairs with a 16,000, but it was fully open. Upstairs we
had smaller room units.
Putting a large unit in a bedroom, you cannot get the proper air
circulation even with a fan in the doorway. You'd have done much
better with two smaller units.
Your point though, is a good one. Mini splits can be just as bad if
not properly laid out. You can't beat a well designed central unit.
I think I miss-stated, it was a 12,000 BTU unit. I was just cooling
the single bedroom, not the rest of the upstairs so the door was kept
almost closed. I guess if people like the ambiance of the typical
motel room with the unit stuck under the window clanking on and off,
with poor circulation, esp to the bathroom, and the loud noise of the
fan they might be happy with a non-central solution at home. It's
certainly an option and in some cases might be the best one for a
particular solution. Certainly for someone who is not home much,
doesn't live where it's particularly hot, and doesn't need to cool a
lot of space it might even be an excellent solution.
I am not talking about a window shaker. These are mini splits and they
are pretty quiet. (29-42 dB)
They are 17-19 SEER so that compares favorably with a regular central
system and if you get the ductwork out of the attic that could be a
For me, the real saving would be the fact that I can zone out the
rooms we seldom use.
I still value the opinion. If I was totally convinced I would not have
On Sun, 28 Jul 2013 11:54:09 -0400, email@example.com wrote:
That sounds better then I was picturing. I suppose a lot would depend
on the aesthetics of the setup (if you care about that aspect). I
know that little system I tried in the bedroom was pretty quiet but
still alot more "disturbing" than the regular central system. Not
sure how many db's though. Can you point to a webpage for what you
are thinking of getting?
I'd like to pose another question, as long as the topic is
I may be looking at buying a house in a different location
before too long. I'll probably be considering ranch-style
I've seen some that are otherwise nice, but don't have
central air installed.
Some have hot water heat, oil or natural gas (latter
preferred by me). No air ducts installed at all.
Given this type of home, and the work that would be involved
installing the ducting for a central air system, is a
mini-split type system easier to install? I would think so,
but will it perform up to (or at least close to) the level
of a central air system? How about reliability?
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