Ducted heat pump vs ductless multi-zone, side by side
Both electrify the whole house; the ranges overlap ($8,000–$16,000 ducted vs $6,000–$15,000 multi-zone). Sound ducts tilt ducted (distribution already owned, invisible delivery, central filtration); no ducts or zoning priorities tilt ductless. It's the duct test's decision more than the brochure's.
| Dimension | Ducted heat pump | Ductless multi-zone |
|---|---|---|
| Distribution | Existing ducts (test first) | Refrigerant lines to each head |
| Zoning | One zone (dampers extra) | Per head, standard |
| Seattle range | $8,000–$16,000 | $6,000–$15,000 by zones |
| Duct losses | Whatever the test says (20–30% typical unsealed) | None |
| Filtration | Central — media cabinet capable | Per-head mesh |
| Visibility | Registers only | Heads in rooms |
| Backup heat options | Strips or dual-fuel furnace | Cold-climate capacity usually suffices here |
Ducted heat pump
Choose ducted when…
Your ducts test sound (or seal to sound), you value invisible delivery and central IAQ mounting, and the house was designed around registers anyway — the classic 1980s+ Seattle suburban profile. Dual-fuel with an existing furnace is this path's bonus option. When the duct test shows manageable leakage, sealing reclaims 10–20% of system capacity per ENERGY STAR — capacity that ductless would have avoided losing in the first place, but that you already paid for when the house was built. Central filtration, UV at the coil, and a media cabinet all mount at one point on a ducted system — the whole-house IAQ play ductless can't replicate without per-head limits.
Ductless multi-zone
Choose ductless multi-zone when…
There are no ducts worth saving, rooms deserve independent control, or duct surgery would eat the budget sealing can't fix. Pre-war Seattle, baseboard mid-centuries, and phased whole-home conversions live here — with the region's highest HSPF2 hardware (PSE's ductless gas-conversion floor is 9.5). Zoning by head also lets you condition occupied rooms only — a quiet operating savings that ducted single-zone systems can't match without added dampers. Each head gets its own thermostat, which solves the bonus-room and stratified-upstairs problems that ducted single-zone systems struggle with unless you add zoning hardware.
The Seattle-area numbers
Ducted heat pump installation
$8,000 – $16,000
All-electric heating + cooling using your existing ductwork
Sources: HVAC Project Cost — Seattle, WA (citing Angi 2026) (2026) · WattFax — 113 WA homeowner quotes (2026)
Ductless mini-split (multi-zone)
$6,000 – $15,000
One or more outdoor units serving 2–4+ rooms
Sources: Seattle Mini Split Pros cost guide (2026) · Angi — ductless mini-split cost, Seattle WA (2026)
These are typical Seattle-area market ranges compiled from published cost guides (Angi, HomeGuide, and Seattle-area 2025–2026 cost studies) — market context, not a quote from Glendale Heating & Air Conditioning. Your home's size, equipment, ductwork, electrical, and permits change the number. National figures are marked; Seattle-area labor typically runs above national averages.
Questions homeowners ask about this choice
Which heats better in a cold snap?
Both, specified correctly: ducted systems lean on backup stages (strips or dual-fuel) below their balance point; cold-climate ductless (H2i-class) holds 100% capacity at 5°F and typically needs no backup in Seattle. Spec the low-temperature capacity either way — it's a listed number, not a vibe.
Which is cheaper to run?
Ductless starts ahead on paper (no duct losses, top HSPF2 ratings); tight sealed ducts narrow it considerably. The bigger operating lever is zoning behavior — heating occupied rooms instead of the whole envelope is where multi-zone households quietly save.
Can the answer be 'both'?
Frequently: ducted for the original footprint, heads for additions and problem rooms. Hybrid layouts are standard practice in expanded Seattle homes — the load map decides, and drawing it is what our estimate visit is for.
Which needs a bigger electrical upgrade?
Usually the ducted path — larger outdoor units, possible strip backup, and the furnace blower's existing circuit. Ductless multi-zone runs one outdoor unit on a dedicated circuit, often smaller than a full ducted heat pump with electric backup. Panel capacity is a line item in both bids; neither should surprise you mid-install.
How do rebates differ between ducted and ductless whole-home?
PSE gas conversions: ducted needs ≥8.1 HSPF2; ductless needs ≥9.5 — the ductless floor is higher. SCL instant discounts step by HSPF2 tier regardless of distribution type. Dollar amounts are similar in range, but the qualifying equipment lists differ. An honest bid names the exact model, its HSPF2 rating, your utility territory, and which program applies — ducted versus ductless changes the model shortlist, not just the install method.
Go deeper
The full ductless-vs-ducted decision guide
Related
Ductless vs central air
Related
Single vs multi-zone
Related
Multi-zone layout patterns
Related
Is your panel ready
Take action
Whole-home heat pump estimate
How we know this
Ranges from published Seattle-area studies (2026); duct-loss figures per ENERGY STAR; configuration patterns from Glendale whole-home conversions.
Reviewed by the Glendale Heating & Air Conditioning team · Last updated 2026-07-15
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