12.4 kWCarrier QSH High Static 12.4kW Ducted System
The 12.4kW Carrier QSH High Static Ducted (indoor 42QSH125D8S-1) is rated at 12.4kW cooling and sized for typical three-bedroom single-storey homes. As a guide it covers roughly 83 to 99m² of conditioned floor area, depending on zoning, insulation and ceiling height. It runs R32 refrigerant and carries Carrier’s 7 year residential parts and labour warranty. For more bedrooms or a larger floor plan, the 13.6kW is the next step up.
Part of the Carrier QSH High Static Ducted range, Carrier's ducted system line, in 5 sizes. Running costs below use the Sydney median rate; the Eastern Suburbs and Western Sydney pages cost systems on their own network tariffs. Check the size against your rooms, compare it with other 12.4 kW options, or ask about supply and installation.
About $746 a year at the current Sydney median electricity rate: $275 of cooling plus $471 of heating, from the official GEMS test figures.
The Carrier QSH High Static 12.4kW uses 950 kWh annually for cooling and 1631 kWh annually for heating under official GEMS test conditions for Sydney's climate zone. These figures are based on typical usage patterns and allow you to calculate running costs using your current electricity rate.
The system achieves a 3.5-star cooling efficiency rating and 2.5-star heating rating for Sydney. Its rated cooling efficiency (AEER) is 3.35 and heating efficiency (ACOP) is 3.91. The unit operates on R32 refrigerant, a low-GWP fluid that reduces environmental impact compared to older refrigerant types.
Source: Australian GEMS registry · median of 170 Sydney residential tariffs · Refreshed monthly · Last updated September 2026
Specifications
From the manufacturer’s published range data. We confirm the exact configuration when we quote.
About the Carrier QSH High Static Ducted range| Brand | Carrier |
|---|---|
| Model | 42QSH125D8S-1 |
| Series | Carrier QSH High Static Ducted |
| System type | Ducted System |
| Capacity | 12.4 kW |
| Refrigerant | R32 |
| ESP (rated/max) | up to 50 / 200 Pa |
| Power supply | 220-240V single phase |
| Warranty | 7 year parts & labour (residential) |
Other 12.4kW options
All ducted systems
Carrier QSM Slim Line 12.3kW
Model 42QSM125D8S. Slim profile, Up to 160Pa
Samsung S2 Ducted 12.5kW
Model AC120TNHPKG / AC120TXAPKG. Whole home, SmartThings
Fujitsu Mid Static Slimline Ducted 12.5kW
Model ARTH45KMTAP. Whole home, Single & three phase