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Old 04-10-2012, 11:15 AM   #1
Join Date: Oct 2008
Location: Albany, NY
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Mini Split Sizing Question for Winter Heat

I'm interested in installing a ducted mini split system, likely a Mitsubishi Mr. Slim, and I had a question in regards to sizing.

First, let me state that I live in Albany, NY and my outside design temperature is negative 1.

The MXZ-3A30NA unit is normally rated at 28,600 btu for heating at 47 degrees. At 17 degrees, it is rated at a maximum of 18,800 btu.

The 18,800 would be below my minimum BTU for the house.

What is normally done in situations like this, upsize to the next size compressor--the MXZ-3A36NA which can output 24,600 btu at 17 degrees, or add a supplemental heating system?


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Old 04-10-2012, 11:22 AM   #2
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Heat pumps just do not work well in cold areas. The back up coils would stay on when it's really cold.


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btu , ducted , mini split , supplemental , winter

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