AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit
Available to order — dispatched on the lead time shown below.
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Retail prices include VAT.
Serving as the flagship multi-split condenser in the range, the AUX Free Match AM5-H42/4DR3 connects up to five indoor units to a solitary exterior heat pump chassis. Delivering 12.0kW (42,000 BTU) of nominal cooling capacity and a potent 13.0kW heating performance, this heavy-duty unit is purpose-built for large UK detached residences, guest houses, and commercial properties requiring independent micro-climate zoning. Engineered with a durable gold-fin anti-corrosion coil, 180° sinusoidal inverter compressor, and low-GWP R32 refrigerant, it maintains premier A++ operational efficiency while driving down running costs throughout the year. The five-port manifold allows any combination of AUX wall-mounted, low-profile ducted, or compact ceiling cassette indoor units to be paired seamlessly. With complete Tuya smart app support and voice integration across indoor units, occupants enjoy bespoke warmth or rapid cooling in every room at the touch of a button.
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 AUX →Official AUX 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 AUX — ask us and we will send the cut sheet with mounting and clearance figures.
Description
Serving as the flagship multi-split condenser in the range, the AUX Free Match AM5-H42/4DR3 connects up to five indoor units to a solitary exterior heat pump chassis. Delivering 12.0kW (42,000 BTU) of nominal cooling capacity and a potent 13.0kW heating performance, this heavy-duty unit is purpose-built for large UK detached residences, guest houses, and commercial properties requiring independent micro-climate zoning. Engineered with a durable gold-fin anti-corrosion coil, 180° sinusoidal inverter compressor, and low-GWP R32 refrigerant, it maintains premier A++ operational efficiency while driving down running costs throughout the year. The five-port manifold allows any combination of AUX wall-mounted, low-profile ducted, or compact ceiling cassette indoor units to be paired seamlessly. With complete Tuya smart app support and voice integration across indoor units, occupants enjoy bespoke warmth or rapid cooling in every room at the touch of a button.
Compare similar units
Side-by-side specs for other multi-split system ac in a similar BTU range.
Common questions about the AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit
How many BTU is the AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit?
The AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit has a cooling capacity of 42,000 BTU, suitable for Up to 130m² across 5 zones.
What room size is the AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit suitable for?
The AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit is recommended for rooms Up to 130m² across 5 zones.
Can I install the AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit 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 AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit smart-home compatible?
Yes — the AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit supports Amazon Alexa, Google Home, Tuya/SmartLife for app and voice control.
How long does delivery of the AUX Free Match AM5-H42/4DR3 12.0kW Five-Port Multi Split Outdoor Unit take?
This unit is dispatched in 2-3 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
341 kWh/yr
EER 13
Standard model
554 kWh/yr
EER 8
Est. saving
£57.52
213 kWh/yr less
Estimate based on the unit's energy-rating efficiency factor and cooling capacity (42,000 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 13 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.
Electric heater / season
£2629
This AC / season
£876
You save / season
£1753
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 3246 kWh | £876 | Up to 300% | |
| Plug-in electric heater | 9738 kWh | £2629 | 100% | |
| Electric storage heater | 9738 kWh | £2629 | 100% |
Heat output estimated from this unit's 44,300 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 £876/season to heat a room vs £2629 for an electric heater - that's £1753 saved. https://stockool.store/products/aux-free-match-am5-h42-4dr3-12-0kw-five-port-multi-split-outdoor-unit
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