Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU
Available to order — dispatched on the lead time shown below.
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Retail prices include VAT.
The Daikin FFA35A/RXM35R9 offers a higher capacity 12,000 BTU output, making it the perfect choice for larger rooms or open-plan commercial areas up to 35m². Like its smaller counterpart, this unit features the signature 'fully flat' design that sits flush with the ceiling, providing a clean, minimalist look that blends into any decor. It utilizes high-efficiency R32 refrigerant to deliver superior cooling and heating performance while keeping energy consumption low. The system is engineered for maximum comfort, featuring individual flap control to direct airflow exactly where it is needed, preventing discomfort from direct air blasts. With built-in smart connectivity, users can monitor energy usage and adjust settings remotely via the Daikin app. This unit is a robust, reliable, and highly efficient climate control solution for those who need a powerful system that remains virtually invisible in the ceiling void. Professional installation is mandatory for this split-system unit.
Need it installed?
We'll match you with a local HVAC engineer.
Smart-home ready
Connects natively with the systems below — control by app or voice.
- Free UK mainland delivery on in-stock units
- Manufacturer warranty included
- 14-day returns
Technical documents & videos
More from Daikin →Full Specifications
Physical dimensions
Exact dimensions for this model are being confirmed with Daikin — ask us and we will send the cut sheet with mounting and clearance figures.
Description
The Daikin FFA35A/RXM35R9 offers a higher capacity 12,000 BTU output, making it the perfect choice for larger rooms or open-plan commercial areas up to 35m². Like its smaller counterpart, this unit features the signature 'fully flat' design that sits flush with the ceiling, providing a clean, minimalist look that blends into any decor. It utilizes high-efficiency R32 refrigerant to deliver superior cooling and heating performance while keeping energy consumption low. The system is engineered for maximum comfort, featuring individual flap control to direct airflow exactly where it is needed, preventing discomfort from direct air blasts. With built-in smart connectivity, users can monitor energy usage and adjust settings remotely via the Daikin app. This unit is a robust, reliable, and highly efficient climate control solution for those who need a powerful system that remains virtually invisible in the ceiling void. Professional installation is mandatory for this split-system unit.
Compare similar units
Side-by-side specs for other ceiling cassettes in a similar BTU range.
Common questions about the Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU
How many BTU is the Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU?
The Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU has a cooling capacity of 12,000 BTU, suitable for Up to 35m².
What room size is the Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU suitable for?
The Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU is recommended for rooms Up to 35m².
Can I install the Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU myself?
No — this unit requires professional installation by a qualified F-gas engineer. Use our Find an Installer service to get matched with a local HVAC professional.
Is the Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU smart-home compatible?
Yes — the Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU supports Amazon Alexa, Google Home for app and voice control.
How long does delivery of the Daikin FFA35A/RXM35R9 Fully Flat Cassette 12,000 BTU take?
This unit is dispatched in 3-5 working days. Delivery is then 1–2 working days to most UK mainland addresses, and 3–6 working days into the EU.
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Mitsubishi ElectricAnnual energy savings estimate
How much this A++-rated unit could save versus a standard C-rated model, based on your usage.
This unit
97 kWh/yr
EER 13
Standard model
158 kWh/yr
EER 8
Est. saving
£16.44
61 kWh/yr less
Estimate based on the unit's energy-rating efficiency factor and cooling capacity (12,000 BTU). Actual savings vary with room size, climate and usage patterns.
Winter heating cost: this AC vs electric heaters
This unit reverses to heat your room in winter. Based on its 4 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.
Electric heater / season
£801
This AC / season
£267
You save / season
£534
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 989 kWh | £267 | Up to 300% | |
| Plug-in electric heater | 2967 kWh | £801 | 100% | |
| Electric storage heater | 2967 kWh | £801 | 100% |
Heat output estimated from this unit's 13,500 BTU/hr rating. A heat pump moves heat (COP ≈ 3), so it uses about a third of the electricity of a direct-electric heater for the same warmth. Actual savings vary with room size, insulation, tariff and usage. See the full comparison →
Share your savings
This heat-pump AC costs only £267/season to heat a room vs £801 for an electric heater - that's £534 saved. https://stockool.store/products/daikin-ffa35a-rxm35r9-fully-flat-cassette
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