I've had two different 'heating specialists' give me a bid on a ductless heat pump, both from a list of recommended contractors from our water and light department. They both came up with the same locations for the two heads but one recommended an 18 in one room and a 12 in the other and the other recommended a 12 and 12. No one really does that load test so I just have to figure out which one is right. I have a 1400 sq. ft. home and I live in Oregon. Our winters lows averages are usually in the thirties but can drop lower. I know there is so much more involved but can anyone guide me in the right direction?