Yes, it is possible to install central air conditioning in a house without ducts by using ductless or alternative ducted solutions that provide whole-home cooling without traditional sheet metal ductwork. The most common solution is a ductless mini-split system from brands like Mitsubishi Electric, Daikin, Fujitsu, and LG, which uses an outdoor condenser connected to multiple indoor wall-mounted or ceiling cassette air handlers via small refrigerant lines, providing zoned cooling without ducts. For a more central look, a high-velocity mini-duct system like Unico or SpacePak uses small 2-inch flexible ducts that can be snaked through walls and ceilings of older homes without major renovation, delivering central air through small outlets. Another option is a ducted mini-split or compact ducted air handler that fits in an attic or closet and uses short duct runs to nearby rooms. The cost for a whole-house ductless system for a 2000 sq ft home is typically 10,000 to 18,000 dollars installed, comparable to adding new ductwork plus conventional central AC. Benefits include higher efficiency up to 22 SEER2, no duct losses which can waste 20 to 30 percent of energy, and zoned temperature control. Drawbacks include higher upfront cost than window units, wall units visible inside, and need for multiple indoor heads. Many older homes, historic homes, and homes with hot water radiator heating successfully use ductless mini-splits as their primary central cooling solution.
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