3.5 kWActronAir Serene 3.5kW Split System
The 3.5kW ActronAir Serene Split (model WRE-035DS) is sized for large bedrooms and smaller living rooms. As a guide, it cools a room of up to about 25 to 29 m². That is from Mitsubishi Heavy Industries' sizing chart for an insulated room: the larger figure if it faces north, the smaller if it faces east. Western sun, poor insulation and high ceilings bring it down. If the space is bigger or sun-exposed, step up to the 5kW.
Part of the ActronAir Serene Split range, ActronAir's split system line, in 6 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 3.5 kW options, see every 3.5kW split system ranked by running cost, or ask about supply and installation.
About $205 a year at the current Sydney median electricity rate: $65 of cooling plus $140 of heating, from the official GEMS test figures.
The ActronAir Serene 3.5kW uses 195 kWh annually for cooling and 424 kWh annually for heating, according to official GEMS registration test data for Sydney's climate zone. The system carries a 6-star energy rating for cooling and 3.5-star rating for heating under the same zoned label. These ratings reflect the efficiency metrics AEER 4.65 and ACOP 4.57 respectively.
Your running costs depend on how much you use the system and your local electricity rate. The annual energy figures above are standard test values and will vary with your own usage patterns and settings.
Source: Australian GEMS registry · median of 170 Sydney residential tariffs, including GST · Refreshed monthly · Last updated October 2026
Specifications
From the manufacturer’s published range data. We confirm the exact configuration when we quote.
About the ActronAir Serene Split range| Brand | ActronAir |
|---|---|
| Model | WRE-035DS |
| Series | ActronAir Serene Split |
| System type | Split System |
| Capacity | 3.5 kW |
| Refrigerant | R32 |
| Controller | WRC series |
