Does anyone have experience with Mr. Slim, a unit made by Mitsubishi
Electric used for heating and cooling small areas? This a ductless unit. I
want to supplement the heating and cooling in a kitchen. The Kitchen is
over a crawlspace and the longest distance from the central cooling/heating
unit. The kitchen faces the west and northwest direction. Complete windows
in that direction. The room is cool in the winter and warmer than desired in
the summer. To have the kitchen comfortable in the winter, the entire house
temperature would need to be increased or just the opposite in the summer.
I have installed a different brand ductless mini-split in my home and am happy
with it. Not sure what you mean by a 'small area', the smallest mini splits are
9000 BTUs and designed to heat/cool over 400 square feet by themselves. You are
proposing to use it to supplement an existing system, possibly in a smaller
area, so it isn't going to run very often.
The Mr. Slim units are among the most expensive on the market, about double the
cost of similar units. They may be worth the extra cost, I don't know.
Yes. We just installed one in an addition going up on my brother's
house. It is a sweet unit but it is a bit pricey. It is so quiet you
have to check to see if it is running, in a/c and heat. There was some
confusion about the control circuits. A piece of literature somewhere
said it used the power feed for control but we found out later (after
installation) that control wires had to be run separately. Luckily the
wall board had not gone up yet.
We've used Mitsubishi (not necessarily Mr. Slim) split units in several
applications, particularly, server rooms in schools, to supplement cooling
and have had very good results and few complaints.
Thanks for the replies. My understanding from the replies from DT, Art and
Tom: the units work, DIY can install, and the Mr. Slim has competition. The
Kitchen I hope to heat and cool is about 300 sg ft with a cathedral ceiling.
Are these assumption correct?
I installed a 14,000 BTU/H ductless heat pump as a supplemental heat
source for my home and I couldn't be happier with its performance.
Last year, it reduced my fuel oil consumption by just over 1,100
litres, for a net savings of $574.00.
This small unit is capable of heating my entire home (a 2,500 sq. ft.
Cape Cod) until the outside temperature falls below -2C (28F). Even
more amazingly, at -10C (14F) -- effectively, the lower operating
range for this particular model -- the heat it provides is one third
less costly than oil and about forty per cent less expensive than
electric resistance [I currently pay 10.13 cents per kWh for
electricity and, as of my last fill, 81.9 cents per litre for heating
oil; my boiler has a AFUE rating of 82 per cent.]
I should add that the HSPF (heating season performance factor) for
this model is 7.2 and I believe the new minimum standard is now 7.7.
I opted for a Friedrich and paid $2,100.00 CDN ($1,800.00 US),
installed, including taxes. At current energy costs, it should pay
for itself within three to four years.
On Sat, 9 Dec 2006 09:06:48 -0500, "John A Reichert"
Paul, Is it diffult to installed? I have on old in-the-wall Dayton Electric
Heater which we don't use mostly because it is too noisy. This unit could
be removed, the hole patch with sheet rock and the electric service used for
the ductless heater.
I confess I'm one chromosome short of the village idiot when it comes
to anything like this, so I had a licensed a/c tech who is familiar
with these systems install it for me. Labour and ancillary materials
came to about $400.00 CDN as I recall, which I consider money well
spent. Truth is, I don't have the knowledge, practical skills, tools
and comfort level to work on refrigeration equipment.
On Sat, 9 Dec 2006 20:50:50 -0500, "John A Reichert"
They aren't real hard to install as long as you get a kit that is pre-charged
and comes with all the wires and correct length tubing. You need a 2 inch hole
in the wall near the ceiling. The power goes to the outdoor unit with a
disconnect nearby usually required by local code. A power cable and control
cable run from the outdoor unit to the indoor unit, along with the two copper
lines. A condensate drip line comes back out of the indoor unit and goes to a
But, and this may be a big factor for you, it will not be factory guaranteed
unless installed by a licensed tech. I would recommend it be professionally
I have some background (and equipment) in automotive AC so I went ahead and did
my own installation. In my case, I needed to make my own custom length lines. I
did a full purge/vacuum check before charging, something you would not have the
equipment to do, I'm assuming. If you are going to pursue the do-it-yourself
route, eBay has plenty of various units, just search on 'mini split'. I live in
a more northern area, and could not find any local sources, they all seem to
sell in CA or FL.
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