Mini split size and head placement area

[jim garvey]

Getting a mini spit system for a new construction small 2 story home (1280 SF) not sure where to place the lower level heat heads. Upstairs I'm thinking will will have one 9k btu heat head in each of the two roughly 300 SF bedrooms. Downstairs will have two 12k btu heat heads. Any advice on the best place to install the downstairs heat heads? This is mostly open space besides the bathroom and a small bedroom. I am thinking of two systems a 18k btu with dual heads upstairs and a 24k btu dual head for downstairs. If one unit fails in the winter we will not be without and heat at all. This is a Michigan home so it is a cool climate in winter.

 

[Fitter30]

You don't need 3.5 of cooling for 1200 sq. ft. A word pay me now or forever. Put money in insulation , windows and doors you could cool and heat with 2 tons of cooling. Need to run a heat load find what you need not a guess. Bosch makes central heat pumps up to 22 seer.