I see an 18 seer mini split heat pump for about 1100. It is 9000 btu. Is that big enough for 300sf? It says it will only heat to about 15 degrees ambient because it doesn't have heat strips. How accurate is that 15 degree statement. We dont get many days at 15 degrees here, but we get quite a few at 25 to 35. I would hat to buy this thing and it is not able to maintain the bed room at 73 in the winter.
As a side note, I am in a HVAC program at my local community college. I want to use this install as a learning project. I will try to do most of the install myself, and I will get my instructor to come out for the lineset evac and start up.
Any advice would be welcome.