Mini splits win on zoning, on efficiency in the spaces they serve, and on installation flexibility. They lose on cost per square foot when you are conditioning a whole house that already has good ductwork. Which matters more depends entirely on the problem you are solving.
No Ductwork, No Duct Losses
This is the fundamental advantage, and in Hill Country homes it is substantial.
A conventional system pushes conditioned air through ducts that, in most homes here, run through an attic reaching 140 degrees in August. Leakage and heat gain in that path waste a meaningful share of what the system produces before it reaches the room.
A ductless mini split delivers conditioned air directly into the space. There is no distribution path to leak, no attic to lose heat into, and no return duct pulling superheated attic air back into the system.
For homes with compromised ductwork, this alone can outweigh every other consideration.
Real Zoning
A central system has one thermostat controlling the whole house, which means the room with the thermostat is comfortable and everything else is a compromise.
Multi-zone mini splits give each area its own head and its own setpoint. Bedrooms on the west side taking afternoon sun can run cooler than the north-facing living room. Unused rooms can be shut off entirely rather than conditioned out of habit.
You also stop overcooling the entire house to make one hot room tolerable — which is what many households are doing without realising it.
Inverter Efficiency and Humidity
Mini splits use inverter-driven compressors that modulate output rather than cycling on and off at full power.
Longer run times at lower capacity remove far more moisture from the air, and in a Texas summer humidity is what determines whether a room feels comfortable. Dry air at 76 degrees beats humid air at 73.
Modulation is also easier on the compressor. Starting is the hardest moment in its life, and equipment that ramps rather than slams tends to last longer — which is why mini splits commonly reach fifteen to twenty years.
Installation Flexibility
Installing a mini split means a small penetration for the line set, not opening ceilings to run duct.
That makes them the practical answer for additions never included in the original duct design, garage conversions, shops, casitas, wine rooms, and manufactured homes where the underfloor belly duct is deteriorated.
They also heat. Every modern mini split is a heat pump, so one unit handles both seasons — which suits our long cooling season and short mild winter well.
Where Central Systems Still Win
We will not pretend the comparison is one-sided.
For a whole house with sound ductwork, a central system usually costs less per square foot conditioned. Covering an entire home with mini splits requires multiple indoor heads, and the total can exceed a central replacement.
Central systems also handle filtration better. A single return with a proper media filter cabinet does more for indoor air quality than the washable filters in mini split heads, and whole-house purification equipment integrates with ducted systems.
Aesthetics matter to some people. A wall-mounted head is visible in a way a ceiling register is not, though ceiling-cassette and recessed options exist.
The Maintenance Difference
Mini splits need more frequent attention than owners expect. Filters wash monthly, and the indoor coil and blower wheel need annual professional cleaning — they sit wet during cooling and develop growth if neglected.
Because they run year-round with no off season, twice-yearly service is the honest schedule. That is covered under our Care Club maintenance plan.
Choosing Between Them
If the problem is one uncomfortable room, a mini split is almost always the better answer than resizing the whole system.
If the problem is an aging central system in a house with reasonable ducts, replacing it — possibly with a heat pump — usually costs less.
We assess ducts before recommending either. Financing is available.
Contact 72 Degrees or call (830) 468-5316.
