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Old 01-28-2013, 05:33 PM   #1
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Mini-split ceiling cassette system


Hey all,

I知 going to be finishing a 500 sq ft space on the second floor of my garage and attaching it to the house. A builder suggested a mini split system for heat and A/C (I知 located in CT), and it seems like this would be a sensible solution. After some research and looking at options online, the single-zone Mitsubishi 12K BTU ceiling cassette system is my top contender. (SUZ-KA12NA.TH + SLZ-KA12NA.TH)

It seems that there isn稚 a ton of reviews/opinions published about ceiling cassette systems in general, let alone the Mitsubishi ones specifically, so I was curious if anyone had any experience or opinions on this. I would also welcome any installation or setup tips or potential problems to look out for. There will be plenty of room above the unit and the ceiling will be drywalled.

I do understand that these are a bit more expensive and are not as easy to install as the wall-mounted models, but I知 willing to make those concessions.

Thanks in advance for any advice, tips, or opinions! Also, does 12K BTU sound about right?

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Old 01-28-2013, 05:43 PM   #2
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Mini-split ceiling cassette system


Make sure it will still heat at your design temps. many stop heating at 0 or -13.

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Old 01-29-2013, 06:28 PM   #3
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Make sure it will still heat at your design temps. many stop heating at 0 or -13.
Yes, I believe this one heats down to -13... Thanks!

Any other thoughts/advice?
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Old 01-30-2013, 12:03 PM   #4
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Mini-split ceiling cassette system


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Thanks in advance for any advice, tips, or opinions! Also, does 12K BTU sound about right?
no way to tell without doing a load calc. For $50 you could try something like HVAC Calc and get a good idea of what the load is. Could save you a few $100 on equipment.
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Old 01-31-2013, 07:37 AM   #5
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Mini-split ceiling cassette system


I have installed a few mitsu. ceiling casettes and had absolutely no problems. Mitsubishi is good stuff.
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Old 01-31-2013, 05:39 PM   #6
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Mini-split ceiling cassette system


I think that they are not as efficient as the high wall units either, but the look is certainly different.
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Old 01-31-2013, 06:27 PM   #7
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Mini-split ceiling cassette system


If its rated for below zero it is probably an inverter system therefore pretty darned efficient. 12,000 BTU sounds just right. I might even contemplate an 18,000 BTU unit for those hard to heat nights. The inverter will allow it to pace itself for inside load conditions.
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Old 02-02-2013, 01:27 PM   #8
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Thanks for all the feedback, guys...

I do plan to work with an HVAC professional on this to ensure proper sizing and installation; I just wanted to do some advanced research and homework. Thanks again!
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Old 02-04-2013, 11:00 AM   #9
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... therefore pretty darned efficient.
The high wall indoor boxes are the most efficient (COP/SEER) judging from the manufacturers' numbers. The short-ducted and ceiling boxes are just not up to the same level for some reason.

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The inverter will allow it to pace itself for inside load conditions.
This is not an issue for the OP, but the outdoor/compressor sections for multiple indoor equipment can't run a single indoor unit to as low a level as the 1:1 systems according to the data I have seen. They are just bigger so it is inherent. That might be something to keep in mind when installing a system with one single and a multi and you can choose where to put the single system -- where it might be running at low levels a lot of the time. (Think bedroom at night.)
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Old 02-09-2013, 12:35 PM   #10
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Mini-split ceiling cassette system


Fujitsu with their 7/5 warranty may present a competitive alternate, think they start at 18k though in cassete, not 12k in single zone
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Old 02-09-2013, 05:02 PM   #11
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Wow, that is huge considering that other brands have residential equipment as low as 5000 and 6000.
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Old 02-09-2013, 05:11 PM   #12
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Wow, that is huge considering that other brands have residential equipment as low as 5000 and 6000.
In a ceiling cassette?
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Old 02-09-2013, 08:13 PM   #13
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9k is the smallest mini-split in a single zone, not cassette...wall mount

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