Mini splits are substantially more efficient than the central systems most homes here are replacing, and the gap comes from three things: no duct losses, inverter-driven compressors, and zoning that lets you stop conditioning space nobody is using.

No Ducts, No Duct Losses

This is the largest single advantage in Hill Country homes.

A conventional system pushes conditioned air through ducts that, in most houses here, run through an attic reaching 140 degrees in August. Leakage at joints and heat gain through duct walls waste a meaningful share of what the system produces before it ever reaches a room.

Return ducts make it worse. Operating under negative pressure, any gap pulls superheated attic air directly into the system, so the equipment is cooling air it should never have been handed.

A ductless mini split delivers conditioned air straight into the room. There is no distribution path to leak and no attic to lose heat into.

For homes with compromised ductwork, this alone can account for most of the efficiency difference.

Inverter Compressors

Conventional systems are single-stage: the compressor is either off or running at one hundred percent. It cools the space quickly, shuts off, and repeats.

Mini splits use inverter-driven compressors that modulate output continuously to match demand. Instead of slamming on and off, the unit runs at whatever fraction of capacity the room actually requires.

That is more efficient for two reasons. Starting a compressor draws far more power than running one, so fewer starts means less consumption. And a system running steadily at partial load operates closer to its optimal efficiency point than one cycling at full output.

Humidity Control Lets You Set the Thermostat Higher

This benefit does not appear in an efficiency rating but shows up on the bill.

Longer run times at lower capacity remove far more moisture from the air. In a Texas summer, humidity is what determines whether a room feels comfortable — dry air at 76 degrees beats humid air at 73.

Households that switch to inverter equipment frequently find they are comfortable at a higher setpoint than before, and every degree higher reduces runtime.

Zoning Eliminates Waste

A central system has one thermostat controlling the whole house. Every room gets conditioned whether anyone is in it or not.

Multi-zone mini splits give each area its own head and setpoint. Guest rooms, offices, and storage areas can run warmer or be shut off entirely.

You also stop overcooling the entire house to make one hot room tolerable — which is what many households are doing without realising it, and it is expensive.

Where the Comparison Is Less One-Sided

We should be straight about the limits.

For a whole house with sound, well-sealed ductwork, a modern high-efficiency central system closes much of the gap, and it 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 proper media filter cabinet does more for indoor air quality than washable filters in wall heads.

Efficiency Depends on Sizing and Maintenance

An oversized mini split short cycles, which defeats the inverter advantage entirely and leaves the room humid despite hitting the setpoint. We size from a load calculation for the actual space.

Maintenance matters more than owners expect. Filters wash monthly, and the indoor coil and blower wheel need annual professional cleaning — a fouled coil costs capacity and efficiency quietly.

Because mini splits heat as well as cool, they run year-round with no off season, so twice-yearly service is the honest schedule. That is covered under our Care Club maintenance plan.

Financing is available. Contact 72 Degrees or call (830) 240-1835.