MiniSplit Blog
The room size ( or square footage ) that a 9000 btu system can cover is up to 400 sqft in standard conditions ( i.e. 8 ft ceilings, decent insulation, closed room / not an open floor plan, etc. ). These units are great for small additions, workshops, shed conversions, small garages, or even a game / media room that your central system just can't keep up with unless it freezes out the rest of the house and empties your wallet in the process.
So long as your needed area coverage is less than 400 sqft a 9000 btu heat pump ac system is a perfect solution for you. And as the systems are variable speed, they can raise and lower their output to match what is called for. This allows the heat pump ac system to handle rooms much smaller than 400 sqft without issues, making these 9000 btu units great for bedrooms and even dens.
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