Ductless Mini-Split: Repair or Replace? (2026 cost comparison)
The rule of thumb, from Consumer Reports: don't spend more than 50% of a comparable new unit on fixing the old one. For a ductless mini-split, that 50% line is about $750–$2,000 NZD — a new unit runs $1,500–$4,000 NZD and typically lasts 10–15 years. If a repair quote lands under that line and the ductless mini-split is not yet past its expected life, repair usually wins. Reviewed July 2026.
Repair vs. replace, side by side Estimated
| Cost | Estimated range |
|---|---|
| Typical repair (this ductless mini-split, all faults we price) | $80–$3,500 NZD |
| New ductless mini-split (unit only) | $1,500–$4,000 NZD |
| The 50% line half a comparable new unit | $750–$2,000 NZD |
Repair: min–max of every ductless mini-split fault we price (sources on each linked problem page) · New unit: Weka Electrical, Auckland Heat Pump Services · Lifespan 10–15 years: Consumer NZ, Weka Electrical · 50% rule: Weka Electrical · Reviewed July 2026 · Estimated
Age × repair-cost worksheet Estimated
Find your ductless mini-split's age down the side and your repair quote across the top. The cell is the way the 50% rule points — Estimated guidance, not advice.
| Age of unit | Repair < 30% of a new ductless mini-splitunder $450–$1,200 NZD | Repair 30–50%$450–$1,200 NZD – $750–$2,000 NZD | Repair > 50%over $750–$2,000 NZD |
|---|---|---|---|
| Under 6 years first half of typical life | Repair likely | Repair likely | Compare quotes |
| 6–15 years second half, under typical lifespan | Repair likely | Compare quotes | Replace likely |
| Over 15 years at or beyond typical lifespan | Compare quotes | Replace likely | Replace likely |
How this is built: we apply the 50% rule (Weka Electrical) — spend no more than half a comparable new unit's cost on a repair — with its lifespan corollary (replacement is favored once the unit is past the midpoint of its expected life and the quote tops 50%). Columns are your repair quote as a share of a new ductless mini-split ($1,500–$4,000 NZD); the $750–$2,000 NZD and $450–$1,200 NZD thresholds are just 50% and 30% of that range. Rows use the midpoint of the expected life (about 6 years — halfway through a typical 13-year lifespan) and the top of the sourced 10–15 years range (15 years). Nothing here is a per-unit price or a recommendation — it is a transparent reading of the rule.
NOT cross-applied from anywhere — these are the local figures. In New Zealand the wall-mounted single-split unit this taxonomy calls a ductless mini-split IS what NZ sources and NZ homeowners mean by 'a heat pump', so the Consumer NZ and NZ-installer service-life figures above describe exactly this equipment; the identical range under 'heat-pump' above is the same appliance class reported once per taxonomy id, not a second independent measurement. The new_unit_nzd range ($1,500–$4,000, supplied and installed) is the SINGLE high-wall split price on which two NZ cost guides converge; only Weka Electrical's cost table explicitly labels its '$1,500 – $4,000' figure 'incl. GST', while Auckland Heat Pump Services' '$1,700 and $4,000' single-split figure is a consumer supplied-and-installed quote assumed GST-inclusive per standard NZ retail price-display practice, not separately confirmed on its page; multi-split (multi-head) systems are a separate, higher band that NZ sources say 'generally start from $5,000', so this figure is deliberately not stretched to cover them. No New Zealand source found published a separate service life for multi-split systems as distinct from single-split, so no split-by-zone-count lifespan figure is offered.
One more thing before you replace
A newer ductless mini-split can cut energy and water use, which shifts the math on an older unit even when a repair is cheap: ENERGY STAR notes clothes washers over ~10 years and refrigerators over ~15 years are common efficiency-driven replacements.
Energy note: · Reviewed July 2026 · Estimated · Informational only
Price the repair first
Before you decide, get the likely repair figure for the exact fault — each page localizes to your metro:
- Full ductless mini-split cost guide
- Not cooling
- Not heating
- Refrigerant leak repair / recharge
- Compressor replacement
- Indoor blower / fan motor replacement
- Indoor head leaking water
- Error code / flashing light fault
- Control board / PCB replacement
- Outdoor unit not running
- Musty or mouldy smell from the indoor unit
Estimated ranges — see the methodology for how we build the repair figures and their named sources. This page is informational and is not repair, purchasing, or financial advice.
Reviewed by a Red Seal–certified appliance technician who also holds a Technical Safety BC gas ticket (Gas-C) and an ODS/halocarbon refrigerant ticket (CFC/HCFC/HFC).