New Zealand · costs in NZD

Reverse cycle split system air conditioner, wall hung

LG WS12TWU / WS12TWN Heat Pump

LG WS12TWU / WS12TWN is a 3.4 kW reverse cycle split system heat pump registered for sale in New Zealand under the trans-Tasman E3 energy rating scheme (registration AAC8307).

c/kWh
Energy rating (cooling)
4
Heating: 2
Annual electricity use
1,632 kWh
169 cooling + 1,463 heating
Estimated running cost
$539 / year
$45 / month · $5,386 over 10 years
Capacity
3.4 kW cooling
4 kW heating

17% more electricity than the median of 187 comparable 3.5 kW reverse cycle split system registrations (1,395 kWh a year) in the cold zone. Uses less than 23% of them.

Across all 3,611 air conditioner registrations sold in Australia, it uses less than 80% (this compares very different sizes, so the cohort figure above is the useful one).

coolingheatingClick a zone to use it across the page.

Annual kWh is the government label figure for a residential user in the cold zone (Canberra climate: Canberra, Hobart, Ballarat, alpine areas). All of New Zealand is the cold zone on the Zoned Energy Rating Label. Cost = kWh × 33c/kWh in NZD; change the price above to your tariff.

LG WS12TWU running cost by climate zone

Climate zonekWh / yearPer year10 years
Cold zone 1,632$539$5,386
Mixed zone 802$265$2,647
Hot zone 854$282$2,818

At 33c/kWh. Formula: cost = annual kWh × price. The kWh figure is the label’s residential estimate for that zone; commercial-profile figures are in the specifications.

Heat pumps that use less electricity

Same configuration and type, cooling capacity within 12% of 3.4 kW, at least 3% lower annual kWh in the cold zone.

ModelStarsEst. cost / yrCompare
Midea MFCA35VA-W/MFCA35VA-N3.6 kW heating3.5 kW cooling1,144 kWh/yr5.5$378
Daikin RXM35AVMA / FTXM35AVMA3.7 kW heating3.5 kW cooling1,146 kWh/yr5.5$378
Midea MFEP35VA-W/MFEP35VA-N3.6 kW heating3.5 kW cooling1,183 kWh/yr6$390
Daikin RXV35AVMA / FTXV35AVMA3.7 kW heating3.5 kW cooling1,207 kWh/yr5$398
Hitachi RAC-VJ35PHAT/RAK-VJ35PHAT3.8 kW heating3.5 kW cooling1,209 kWh/yr5$399

Heat pumps similar to the LG WS12TWU

Technically comparable registrations: same configuration and type, capacity within 12%.

ModelStarsEst. cost / yrCompare
Mitsubishi Electric MUZ-GS35VFD2/MSZ-GS35VFD23.7 kW heating3.4 kW cooling1,433 kWh/yr3$473
Mitsubishi Electric MUZ-GS35VFD/MSZ-GS35VFD23.7 kW heating3.4 kW cooling1,433 kWh/yr3$473
Fujitsu AOTH12KNCA/ASTH12KNCA4 kW heating3.4 kW cooling1,660 kWh/yr4$548
Braemar WCHV35D1T/WSHV35D1T3.7 kW heating3.5 kW cooling1,450 kWh/yr4$479
Samsung Electronics AR40H12C1AMX / AR40H12C1AMN4 kW heating3.5 kW cooling1,423 kWh/yr5$470
Hitachi RAC-VJ35PHAT/RAK-VJ35PHAT3.8 kW heating3.5 kW cooling1,209 kWh/yr5$399
Midea MFEZ35VA-W/MFEZ35VA-N3.8 kW heating3.5 kW cooling1,217 kWh/yr6$402
Midea MFEP35VA-W/MFEP35VA-N3.6 kW heating3.5 kW cooling1,183 kWh/yr6$390

Compare WS12TWU / WS12TWN with another model

LG WS12TWU specifications

Type
Reverse cycle
Configuration
Split system
Air distribution
Non-ducted
Indoor unit
Wall hung
Rated cooling capacity (35 °C)
3.40 kW
Cooling power input
0.90 kW
Rated heating capacity (7 °C)
4.00 kW
Heating power input
0.99 kW
EER, full load (tested)
3.95
COP, full load (tested)
4.19
Rated AEER
3.77
Rated ACOP
4.01
Standby power (PIA)
2.0 W
Compressor
Variable speed, Inverter
Refrigerant
R32
Power supply
Single phase
Indoor sound power
60.2 dB(A)
Outdoor sound power
58.3 dB(A)
Demand response (AS/NZS 4755)
Yes (mode 1 on off, mode 2 50 percent, mode 3 75 percent)
Dimensions (W×H×D)
837 × 308 × 189 mm
Country of manufacture
Thailand

Dimensions are not collected for registrations under the 2019 Determination, so they are shown only where the source has them.

LG WS12TWU zoned energy rating figures

As published for each climate zone. Residential figures drive the star ratings; commercial figures assume a commercial usage pattern.

ZoneCooling starsHeating starsCooling kWhHeating kWh
Coldcommercial––286466
Coldresidential4.02.01691,463
Mixedcommercial––403240
Mixedresidential3.52.5267535
Hotcommercial––96351
Hotresidential4.03.077480
Part-load test points (23 values)
c__t1_min_cap_power_rated
267 W
h__h2_ext_cap_power_rated
1450 W
c__t1_half_cap_power_rated
370 W
c__t1_have_min_cap_results
Yes
h__h1_half_cap_power_rated
409 W
h__h1_have_min_cap_results
No
h__h3_have_ext_cap_results
No
h__h2_have_full_cap_results
No
h__h2_have_half_cap_results
No
h__h3_have_full_cap_results
No
h__h3_have_half_cap_results
No
h__h2_ext_cap_heat_cap_rated
3650 W
h__h1_half_cap_heat_cap_rated
2000 W
h__h2_is_capable_extended_load
Yes
c__low_temp_min_cap_power_rated
197 W
c__t1_min_cap_cooling_cap_rated
1240 W
c__low_temp_full_cap_power_rated
818.0300000000001 W
c__low_temp_half_cap_power_rated
278 W
c__t1_half_cap_cooling_cap_rated
1700 W
c__low_temp_have_half_cap_results
Yes
c__low_temp_min_cap_cooling_cap_rated
1300 W
c__low_temp_full_cap_cooling_cap_rated
3661.7999999999997 W
c__low_temp_half_cap_cooling_cap_rated
1819 W

New Zealand E3 registration details

Registration number
AAC8307
GEMS registration id
162528
Status
approved, available (self-reported)
Registration expires
20 June 2029
Registered for sale in
Australia, New Zealand
Family
–
Regulatory standard
[SEER Non Multi-Split <=65kW] GEMS (Air Conditioners up to 65kW) Determination 2019
Test standard
AS/NZS 3823.1.1:2012
MEPS
2019
Product class
Class 8

Source: E3 programme registration data (EECA, New Zealand) (trans-Tasman E3 registration data published by DCCEEW on data.gov.au, CC BY 3.0 AU). Dataset published 19 September 2026; last checked 20 September 2026. How the derived figures are calculated.