
Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System
Available to order — dispatched on the lead time shown below.
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Retail prices include VAT.
The Sinclair Vision ASH-12BIV is a stylish 3.5kW wall-mounted split system heat pump engineered to combine high thermodynamic efficiency with contemporary interior styling. Rated A++ for cooling and A+ for heating, it delivers efficient climate control for mid-sized bedrooms, garden studios, and open dining rooms. The low-profile indoor unit features an aerodynamic cross-flow turbine fan that moves air smoothly at low revolutions, achieving near-inaudible background sound levels. Advanced DC inverter technology regulates output continuously to prevent energy waste and temperature swings. Remote Wi-Fi functionality enables comprehensive control over running schedules from any smartphone or tablet. The outdoor condenser incorporates anti-corrosion blue-fin protection and works consistently down to -15°C external conditions, offering reliable, low-carbon heat throughout freezing UK winters.
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 Sinclair →Official Sinclair manual
The manufacturer's PDF for this model is being sourced and will be downloadable here.
Full Specifications
Physical dimensions
Exact dimensions for this model are being confirmed with Sinclair — ask us and we will send the cut sheet with mounting and clearance figures.
Description
The Sinclair Vision ASH-12BIV is a stylish 3.5kW wall-mounted split system heat pump engineered to combine high thermodynamic efficiency with contemporary interior styling. Rated A++ for cooling and A+ for heating, it delivers efficient climate control for mid-sized bedrooms, garden studios, and open dining rooms. The low-profile indoor unit features an aerodynamic cross-flow turbine fan that moves air smoothly at low revolutions, achieving near-inaudible background sound levels. Advanced DC inverter technology regulates output continuously to prevent energy waste and temperature swings. Remote Wi-Fi functionality enables comprehensive control over running schedules from any smartphone or tablet. The outdoor condenser incorporates anti-corrosion blue-fin protection and works consistently down to -15°C external conditions, offering reliable, low-carbon heat throughout freezing UK winters.
Compare similar units
Side-by-side specs for other split system ac in a similar BTU range.
Common questions about the Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System
How many BTU is the Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System?
The Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System has a cooling capacity of 12,000 BTU, suitable for 25-35 m².
What room size is the Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System suitable for?
The Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System is recommended for rooms 25-35 m².
Can I install the Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System 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 Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System smart-home compatible?
Yes — the Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System supports Amazon Alexa, Google Assistant for app and voice control.
How long does delivery of the Sinclair Vision ASH-12BIV 3.5kW Wall Mounted Inverter Split System take?
This unit is 3-5 business 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
£742
This AC / season
£247
You save / season
£495
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 916 kWh | £247 | Up to 300% | |
| Plug-in electric heater | 2748 kWh | £742 | 100% | |
| Electric storage heater | 2748 kWh | £742 | 100% |
Heat output estimated from this unit's 12,500 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 £247/season to heat a room vs £742 for an electric heater - that's £495 saved. https://stockool.store/products/sinclair-vision-ash-12biv-3-5kw-split-system
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