jdanderson
New Member
On a side note, I did spray foam insulation in our 4000 sq ft building.Just as a data point I will add, my 3 units handled -3F no problems vs "5F" rating. Youtuber @SmitHVAC showed they have compressor heat so I think once in a while arctic blast use should be OK, there is no condenser pan heat though so if your climate is 0F continuously you'd have an iceberg building ? ?
7" on the roof, 2 1/2" on the walls.
The building stayed 50 and above during a 4 day stretch below freezing.
With no heat input yet...
So that was encouraging. My LiFePO4 battery bank never got too cold.