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Ductless Mini-Split vs. Central HVAC: Which Is Right for Your Home?

A central ducted system conditions the whole home through a duct network. A ductless mini-split conditions one or more rooms through wall-mounted or ceiling-cassette air handlers connected by refrigerant lines to a single outdoor unit — no ductwork required.

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Central ducted HVAC (furnace + AC or heat pump)

Strengths

  • Most cost-effective for whole-home conditioning in homes with existing ductwork
  • Single thermostat; familiar technology for homeowners
  • Whole-home air filtration and humidity control integrated into one system
  • Lower per-square-foot cost in standard home configurations

Trade-offs

  • Duct losses (15–25%) reduce delivered efficiency vs. equipment rating
  • Can't add without ductwork — major construction in older North Shore homes without ducts
  • Single-zone control — whole house heats/cools even when rooms are unoccupied

Ductless multi-zone mini-split

Strengths

  • No ductwork required — ideal for additions, garages, older homes
  • Room-by-room temperature control — heat only occupied zones
  • Inverter-driven compressors maintain efficiency to –13°F
  • No duct losses: system delivers efficiency close to its rated SEER₂/HSPF₂
  • ComEd rebates may apply

Trade-offs

  • Higher per-square-foot cost for whole-home conditioning vs. ducted replacement
  • Multiple indoor units require individual filter cleaning every 2–4 weeks
  • Wall-mounted units are visible and not preferred by all homeowners
  • Multi-zone systems require careful engineering to avoid compressor overload
Typical installed ranges

North Shore cost bands

OptionTypical rangeNotes
Central ducted replacement (furnace + AC, existing ductwork)$7,000–$16,000Whole-home. Includes duct inspection/sealing. Rebates may apply.
Single-zone ductless mini-split (one room/addition)$3,500–$6,000One indoor + one outdoor unit. Ideal for additions or problem rooms.
Multi-zone ductless (3–4 zones, full home)$12,000–$22,000Comparable comfort to ducted with no duct losses. Higher per-zone cost.
What changes the price
  • Whether existing ductwork is present and in good condition
  • Whether the project is a whole-home system or an addition/zone
  • Aesthetics — ductless wall units are visible; some homeowners prefer concealed ducted systems
  • Desire for room-by-room control vs. whole-home single-zone simplicity
  • ComEd rebate eligibility for heat-pump mini-splits

FAQs

Can ductless replace my entire ducted HVAC system?
Yes, with a multi-zone system. It's common in older North Shore homes without ductwork. Cost per square foot is higher than a ducted replacement, but no duct installation is needed and room-by-room control improves energy use.
Do ductless systems need more maintenance than ducted?
The washable filters on indoor units need cleaning every 2–4 weeks — more frequent than a ducted system's filter. Annual professional service is the same as ducted. Legendary's service agreements cover ductless systems.

Editorial provenance

Content by Legendary Service editorial team

Updated:

Methodology

Guidance compares the stated system factors, applicable utility program rules, and the conditions that must be confirmed in the home. Figures are planning ranges, not quotes; Legendary Service provides an upfront flat-rate price after diagnosis.

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