Mini-Split
A ductless heat pump system with an outdoor compressor unit connected to one or more indoor air handlers (heads) mounted on walls or ceilings. Each head controls its own zone.
Why It Matters
Mini-splits are the most efficient way to heat and cool specific zones, especially in homes without existing ductwork. Adding a mini-split to a cold room can be cheaper than extending ductwork.
Related Terms
Heat Pump
An efficient HVAC system that transfers heat rather than generating it, providing both heating and cooling. Air-source heat pumps are most common; ground-source (geothermal) are most efficient.
Variable-Speed Compressor
A compressor that can modulate its speed continuously (using an inverter-driven motor) rather than cycling fully on and off. This allows the system to match output precisely to demand.