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1 Expect to pay $2,000-$5,000 to install a complete ductless mini-split air conditioning system in a 800-1,000-square foot home, or $5,000-$7,000 for a 2,000-square-foot house.
Shopping for a ductless air conditioner: 1  A ductless unit is a split system just like central air, only smaller and more flexible. 2  The compressor sits outdoors and is connected by a pair of refrigerated lines to one or more air handlers inside the house.aying $4000 for a 12000 BTU heat pump mini split installed for a sun filled family room. The unit meets the standards for the 30% rebate plus $500 from Nstar rebate. Final cost $2300.