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?