WA Lic. INFINHA841B8 400+ Google reviews
Quick answer
- Ductless wins when there's no ductwork to reuse — additions, garages, ADUs, and older homes with plaster walls.
- Ducted wins when your existing ducts are sized right and sealed well — one system, one thermostat, no visible indoor units.
- Ductless gives you room-by-room zoning by design; a ducted system needs zoning dampers added if you want that same level of control.
- Leaky, undersized, or crushed ductwork can erase a ducted heat pump's efficiency advantage before the air ever reaches a room.
What each system actually is
Ductless systems pair one outdoor unit with one or more wall-, ceiling-, or floor-mounted indoor heads — multi-zone lines like the Hisense Hi-MULTI family run several heads off a single outdoor unit, each with its own thermostat. Ducted systems use one indoor air handler tied into your home's ductwork, distributing air through vents the same way a furnace does.
Where ductless clearly wins
Room additions, garage conversions, finished attics, detached shops and ADUs, and older homes with plaster-and-lath walls where running new ductwork means significant demolition — ductless needs only a small line-set penetration, not a network of new supply and return runs.
Where ducted clearly wins
Homes with existing ductwork that's already sealed and correctly sized, and owners who want whole-home comfort from a single thermostat without a wall-mounted head visible in every room. If the ducts are healthy, a ducted heat pump is often the more seamless upgrade.
The hybrid most South Sound homes actually get
Plenty of houses end up mixed: a ducted heat pump serving the main living areas, plus one ductless head for a bonus room, garage, or addition the ductwork never reached. That's not a compromise — it's often the correctly designed answer for an irregular home.
Where this decision goes wrong
Assuming leaky ducts don't matter
Installing a ducted heat pump onto ductwork nobody tested for leakage or sizing is a common shortcut. Heat pumps are more airflow-sensitive than furnaces, and duct leakage quietly eats the efficiency gain you paid for — sometimes most of it.
Under-zoning a ductless system
Trying to cover an entire open floor, or rooms separated by closed doors, with too few indoor heads leads to uneven comfort — the room with the head is fine and the rest of the space isn't. Zone count should match your layout, not just your budget.
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Family owned · WA Lic. INFINHA841B8 · 400+ Google reviews
Common questions
Can I mix ductless and ducted in the same house?
Yes — this is common and often the smartest layout. A typical example: a ducted heat pump for the main living areas, with one ductless head for a garage, shop, or bonus room the ducts never reached.
Do ductless heads need to go in every room?
No. Open floor plans and homes with good airflow between rooms may need only two or three heads for an entire main floor — zone count is sized to your actual layout, not a per-room formula.
Is a multi-zone ductless system less efficient because it has more indoor heads?
Not inherently — multi-zone lines like the Hisense Hi-MULTI family run one properly sized outdoor unit for several heads, each matched to its zone's load during design. It's a different engineering approach, not an efficiency penalty.
Will a ducted heat pump work with my existing furnace ductwork?
In most cases, yes, once we verify sizing and seal any leaks — that check is part of every free estimate, before we quote either system.
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Infinity Heating & Air — licensed WA HVAC contractor (Lic. INFINHA841B8), family-owned in Graham. Last updated 2026-07-14.