Aircon installer pricing in Invercargill

NZ$105 to NZ$180 per hour for heat-pump service and install work, including EWRB sign-off. Per-install: single-zone heat pump NZ$3,630 to NZ$9,000; multi-zone NZ$10,250 to NZ$21,900; ducted multi-zone NZ$14,400 to NZ$33,750. Add GST at 15 percent. Print EWRB practising licence, Refrigerant Handler licence and IRHACE membership on every quote.

Cold maritime climate. Summer temperatures rarely exceed 22 degrees (one of NZ's coolest summers) so cooling demand is minimal (a NZ$6,880 cooling-only system makes no sense in Invercargill). Winter heating drives the market; heat-pump retrofit is significant under Healthy Homes Standards 2019 and NZ Building Code H1. Quote heating-capacity sizing (kW heating output at 0 degrees outdoor, sized for cold-winter critical load) not nominal cooling. State 'sized for Invercargill winter heating load' on every quote.

Healthy Homes Standards 2019 require one fixed heater able to heat the main living room to 18 degrees minimum. Heat pump is the default route. SIT student rental landlord portfolios drive landlord install volume; quote per-property (NZ$3,630 to NZ$9,000) at landlord portfolio rates. Build retained agreements with 3 to 5 student-rental landlords for November to February turnover scheduling.

EWRB registration (mandatory for the electrical sign-off). Refrigerant Handler licence (ATC-issued, mandatory for refrigerant handling). IRHACE (Institute of Refrigeration, Heating and Air Conditioning Engineers) membership (trust signal). Site Safe NZ for site operatives. Print all on every relevant quote and invoice.

H1 (November 2022) raises insulation R-values. Heat-pump sizing must reflect the new lower heat-loss numbers; oversizing wastes energy and undersizing fails Healthy Homes. Invercargill sits in climate zone 3 alongside Dunedin and Central Otago, the coldest residential zone, so size for 0 degree outdoor heating load. Quote H1-compliant heat-loss calculation (NZ$375 to NZ$1,500) and unit sizing report on every quote.

Wall-split installations run roughly $375-500 per kW installed. A 5kW unit fully installed is $2,250-3,200; a 12kW multi-head system is $6,250-9,000. Ducted systems run $875-1,200 per kW because of the ducting work.

Heat-load rule of thumb: 0.15kW per square metre in moderate climates, 0.20kW in hot climates. A 25sqm bedroom needs 4-5kW; a 50sqm open-plan needs 7-9kW. Over-sized units short-cycle and waste energy; under-sized never cool the room. Insist on a heat-load calc for any install over $3,750.

For installs over $2,500, get 2-3 quotes. Compare brand, capacity, warranty, refrigerant type, and install detail. The cheapest quote often uses budget brands with 3-year warranties vs branded units with 5-7 year warranties for 10-20% more.

Wall splits are individual units, cheaper, easier to install, each room independent. Ducted is one outdoor unit with hidden roof-space ducting to all rooms, more expensive but cleaner aesthetic and centralised control. Wall splits cost half what ducted does for the same total kW.

A standard 5kW wall-split install is 4-6 hours for a 2-person team. Multi-head and ducted systems take 2-3 days. Larger commercial or ceiling-cassette installs take 4-5 days.