Two fundamentally different approaches
Central air uses one system with ductwork distributing conditioned air throughout the house. Ductless mini splits use individual indoor units mounted in each room or zone, connected to an outdoor compressor via refrigerant lines, no ductwork required.
When mini splits clearly win
Additions without existing ductwork. Extending your central system's ductwork into a new room addition is often more expensive and less effective than a dedicated mini split zone. No ducts to install, no static pressure balancing issues with your existing system.
Garages, workshops, and sunrooms. Spaces that aren't part of your main conditioned envelope but need comfort control. A single-zone mini split handles this cleanly.
ADUs and detached structures. Guest houses, mother-in-law suites, converted sheds. Mini splits give these standalone comfort control without extending ductwork from the main house.
Historic homes with no ductwork. Older Ocean Springs or Bay St. Louis historic homes often were never built with ducts. Retrofitting full ductwork is invasive and expensive; mini splits solve comfort without altering the home's structure.
Room-by-room zoning needs. If different family members want different temperatures in different rooms, a multi-zone mini split system gives independent control per zone, something central air can only approximate with expensive zoning dampers.
When central air wins
Whole-home comfort in a standard layout. If you have a typical single-family home with reasonable existing ductwork, central air remains simpler to maintain and often cheaper for whole-house coverage compared to installing many mini split heads.
Resale value expectations. Most buyers expect central air in a standard home. A house with only mini splits (no central system) can raise questions during a sale, even though the technology works excellently.
Aesthetic preference. Some homeowners don't love the look of wall-mounted or ceiling-cassette indoor units in every room. Central air's ductwork and vents are less visually present (though modern mini split heads have gotten sleeker).
Cost comparison
Single-zone mini split: $4,200-$6,800 installed Multi-zone mini split (up to 8 zones): $8,500-$18,000 installed depending on zone count Standard central air replacement (existing ductwork): $6,400-$8,900 Full central air with new ductwork: $11,000-$16,000
For a single room or small addition, mini split usually wins on cost. For whole-home coverage in a typical layout, central air is often comparable or cheaper per square foot of coverage.
Efficiency comparison
Mini splits, especially Mitsubishi and Daikin inverter models, often achieve higher SEER2 ratings (20+ is common) than standard central systems, since there's no duct loss (typically 20-30% of conditioned air is lost through ductwork leaks and thermal transfer in a standard system). A mini split delivers 100% of its output directly to the room.
This is part of why mini splits work so well for the Coast's humidity control challenge: no duct losses, and most models use variable-speed inverter technology by default.
Combining both: the hybrid approach
Many Coast homes use central air for main living areas and add a mini split for a garage conversion, sunroom, or addition. This hybrid approach is increasingly common and often the most cost-effective solution overall, using each technology where it fits best rather than forcing one system to do everything.
Which one for your situation?
Depends on your specific layout, existing ductwork condition, and which rooms need coverage. A free in-home assessment lets us map out the most cost-effective approach, whether that's straight central air, straight mini split, or a hybrid.
Call (228) 265-8609 for a free consultation.