Ducted Mini-Split Systems in Morgan Hill, CA

How a ducted mini-split works

The outdoor unit is an inverter-driven heat pump — the same technology as a ductless mini-split, able to modulate capacity rather than switching flat out and off. Instead of running refrigerant to a wall-mounted head in each room, it runs to a low-profile air handler concealed in an attic, ceiling cavity, soffit or closet. That air handler is connected to a short, purpose-designed duct system that feeds two to five registers.

The result behaves like a small, very efficient central system serving one zone. Each zone keeps its own thermostat, so a bedroom wing can be set independently from the living areas.

Ducted vs. ductless at a glance

Where they make sense in Morgan Hill homes

Ducted mini-splits fit naturally where the walls are already open or the layout is being reworked: remodels, additions, ADUs, garage and attic conversions, and second floors that have never held temperature in a South Valley summer. They also suit smaller homes where one or two zones can cover everything, and any project where the homeowner does not want indoor units on show.

A common hybrid design serves the bedrooms with one concealed ducted air handler and the open living area with a single ductless head, both on one multi-zone outdoor unit. See ductless mini-split installation for the other half of that comparison.

Design details that decide the outcome

Ducted mini-split air handlers develop far less static pressure than a conventional furnace blower, so duct design is not optional. Runs should be short, generously sized, sealed, and kept inside conditioned space wherever possible — a beautifully specified inverter system feeding leaky attic ducts gives back its advantage. Each zone's capacity should come out of a Manual J load calculation for that zone; a rule of thumb tends to oversize, which can shorten run cycles and cost more than it needs to.

Existing ductwork can sometimes be reused, but only after it is measured. Our ductwork assessment guide and ductwork replacement page cover what to look for.

Electrical, placement and permits

Each outdoor unit needs a dedicated circuit and disconnect. Many single-zone and multi-zone systems work within an existing residential service, but an all-electric conversion or a panel already near capacity deserves a proper look — electrical panel considerations explains when an upgrade is genuinely needed. Outdoor unit placement should account for airflow clearance, service access and operating sound relative to bedroom windows and neighbouring properties. Equipment, ductwork and electrical work are permitted and inspected in Morgan Hill; see Morgan Hill HVAC permits.

Cost factors

Number of zones, indoor cabinet type and capacity, the amount of new ductwork, ceiling or soffit work to conceal it, lineset length, electrical work, and permit and inspection fees. Because heat pump equipment is involved, some projects are eligible for incentives — see rebates and incentives and HVAC cost factors.