Product Identification
Bonaire Optima Series III MK2 3.5kW Split System – STH035S1AI / STH035S1AE
Indoor unit: STH035S1AI |
Outdoor unit: STH035S1AE |
System type: Reverse cycle wall-mounted split system
Product Overview
The Bonaire 3.5kW split system is a versatile reverse cycle air conditioner designed to deliver efficient cooling and heating for bedrooms, larger home offices, small living rooms and other residential areas. This complete system combines the STH035S1AI indoor unit with the matching STH035S1AE outdoor unit, providing the two components required for a professionally installed single-room split system.
With 3.5kW rated cooling capacity and 4.0kW rated heating capacity, the system offers greater output than the smaller 2.6kW model while retaining a compact wall-mounted indoor design. It can be a practical choice for rooms that require additional capacity because of their size, window area, orientation or regular occupancy.
The Bonaire Optima Series III MK2 range combines inverter operation with smart Wi-Fi control, 3D airflow, self-cleaning technology, dehumidification, R32 refrigerant and an “I Feel” temperature-sensing function. Together, these features support convenient operation and year-round indoor comfort.
Customers can request a product supply or installation quote through Air Conditioning Trade. Capacity should always be checked against the room and property before purchase because floor area alone cannot determine the correct air conditioner size.
Quick Highlights
- Cooling capacity: 3.5kW rated, with a 0.9–4.2kW operating range
- Heating capacity: 4.0kW rated, with a 0.9–5.2kW operating range
- Complete system: Matched indoor and outdoor units supplied as one product
- Smart control: Wi-Fi connectivity for compatible smartphones and tablets
- System operation: Reverse cycle heating and cooling
- Refrigerant: R32 refrigerant
- Comfort functions: 3D airflow, dehumidification and “I Feel” temperature sensing
- Ideal use: Bedrooms, home offices and smaller living areas
Why Choose the Bonaire 3.5kW Split System?
The Bonaire STH035S1AI 3.5kW split system offers a balanced capacity for residential rooms that may be too demanding for a smaller air conditioner. Its 3.5kW cooling output can support comfortable indoor conditions during warmer weather, while its 4.0kW rated heating capacity provides reverse cycle warmth when temperatures fall.
Inverter technology allows the compressor to vary its output in response to changing room conditions. After the room approaches the selected temperature, the system can reduce its output instead of continually operating at maximum capacity. This can help provide more consistent comfort and avoid unnecessary energy use.
The published cooling operating range is approximately 0.9kW to 4.2kW, while the heating operating range is approximately 0.9kW to 5.2kW. Actual performance and energy consumption will depend on installation quality, room conditions, insulation, windows, external temperature and the temperature selected by the user.
Key Features
Reverse Cycle Heating and Cooling
One system provides both cooling and heating, allowing the room to remain comfortable during warm summers and colder Melbourne weather.
Smart Wi-Fi Control
Compatible Wi-Fi functionality allows supported settings to be accessed through a suitable smartphone or tablet. Users may adjust operation, monitor the unit and create schedules after the system has been connected and configured correctly.
Inverter Technology
Inverter operation enables the system to vary its capacity based on room demand. This supports steadier temperature control compared with equipment that only switches between full output and off.
R32 Refrigerant
The system uses R32 refrigerant, which is commonly found in current-generation residential split air conditioners. Refrigerant work must be completed by an appropriately licensed professional.
3D Airflow
The 3D airflow function helps distribute conditioned air around the room, supporting more balanced comfort throughout the occupied space.
“I Feel” Temperature Sensing
The “I Feel” function can assist the system in responding to temperature conditions around the sensing location rather than relying solely on the sensor inside the wall-mounted unit.
Dehumidification Mode
A dehumidification setting can help reduce excess moisture in the indoor air during humid conditions, improving comfort without requiring maximum cooling operation.
Self-Cleaning Function
Self-cleaning technology supports ongoing indoor-unit care. It does not replace regular filter cleaning, inspection or professional servicing.
Gold Fin Coating
Gold Fin coating provides additional corrosion resistance for the outdoor heat exchanger. Appropriate installation positioning and regular maintenance are still required.
DRED Enabled
The system is compatible with Demand Response Enabling Device applications where supported services, equipment and connections are available.
Ideal Applications
- Medium-sized bedrooms and master bedrooms
- Home offices and study areas
- Small living rooms or sitting areas
- Apartments and townhouses
- Residential rooms with moderate cooling and heating requirements
- Replacement of an older, similar-capacity split system
A 3.5kW air conditioner is often selected for a medium-sized bedroom or smaller living space. However, the correct capacity depends on more than room dimensions. Ceiling height, insulation, window area, direct sunlight, room orientation, occupancy and heat-producing appliances should all be considered.
An undersized system may operate continuously without achieving the desired temperature, while an unnecessarily oversized system may cycle more frequently. Professional capacity advice is recommended before confirming your order.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Bonaire |
| Series | Optima Series III MK2 |
| Indoor model | STH035S1AI |
| Outdoor model | STH035S1AE |
| Rated cooling capacity | 3.5kW |
| Cooling range | 0.9–4.2kW |
| Rated heating capacity | 4.0kW |
| Heating range | 0.9–5.2kW |
| Cooling input power | 0.87kW rated |
| Heating input power | 0.85kW rated |
| Refrigerant | R32 |
| Power supply | 220–240V, 50Hz |
| Breaker size | 16A |
| Indoor sound power level | 54dB(A) |
| Outdoor sound power level | 64dB(A) |
| Indoor dimensions | 820 × 306 × 195mm |
| Indoor net weight | 9kg |
| Outdoor dimensions | 795 × 305 × 549mm |
| Outdoor net weight | 24kg |
| Liquid pipe size | 6.35mm (1/4 inch) |
| Gas pipe size | 9.52mm (3/8 inch) |
| Factory pre-charge | Up to 10 metres |
| Maximum pipe distance | 15m length / 10m height |
Installation and Compatibility
This product is supplied as one matched system containing the STH035S1AI indoor unit and STH035S1AE outdoor unit. Although the two components have separate model numbers, customers should select a quantity of one when requesting one complete split system.
Installation must be completed by a suitably licensed air conditioning professional. Final installation requirements may vary according to pipe length, electrical access, wall construction, condensate drainage, outdoor-unit placement, mounting requirements and site accessibility.
Installation is not included unless it is clearly listed in the written quotation. Contact Air Conditioning Trade with the installation address and basic room details to request product supply, delivery and installation assistance.
Frequently Asked Questions
Does this product include the indoor and outdoor units?
Yes. One complete product includes the STH035S1AI indoor unit and matching STH035S1AE outdoor unit.
Does the system provide heating as well as cooling?
Yes. This reverse cycle system provides 3.5kW rated cooling and 4.0kW rated heating.
Can the Bonaire 3.5kW system connect to Wi-Fi?
Yes. The range includes smart Wi-Fi functionality. A suitable Wi-Fi connection, compatible device and correct application setup may be required.
What room size is suitable for a 3.5kW system?
It is commonly considered for medium-sized bedrooms, home offices or smaller living areas. Professional sizing is recommended because each room has different heat loads and insulation conditions.
Is installation included in the displayed price?
Installation is included only when expressly stated in the quotation. Additional electrical work, pipework, brackets, drainage or access requirements may affect the installed cost.
Why Buy From Air Conditioning Trade?
Air Conditioning Trade supplies dependable air conditioning equipment to homeowners, installers and trade customers across Melbourne. Request current pricing, product availability, Melbourne delivery information and professional installation support for the Bonaire Optima Series III MK2 3.5kW split system.
Manufacturer information:
View the Bonaire split-system product range
Product specifications, availability and features should be confirmed against current manufacturer documentation before purchase or installation.
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