Which Mitsubishi Heavy Industries split system suits each room? Sizes, prices and the cash back

A 2.5 kW Mitsubishi Heavy Industries split system suits a bedroom, a 5.0 kW unit suits a main bedroom or medium living room, and open plan living needs 6.3 to 7.1 kW. Installed with Wi-Fi by Faze those sizes run from $2,053.81 to $3,131.82 including GST, and until 31 January 2027 each one earns an MHI cash back of $100 to $200 that you claim yourself after the install.

Which size for which room?

Sizing is where most split system regrets start. An oversized unit cools the room fast, shuts off and never runs long enough to pull the humidity out, which in a Brisbane summer leaves the room cold and sticky at the same time. An undersized unit runs flat out all afternoon and still loses. The table is our starting guide, and we confirm it with a heat load assessment before we quote.

West facing glass, a dark roof with no ceiling insulation, or a room that opens onto a hallway all push the size up a step. Our air conditioner sizing guide walks through the measurements if you want to check a room yourself.

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The MHI ranges we install

The Ciara is the MHI unit we install most, in 2.0 to 7.1 kW with Wi-Fi included at the prices above. For 8.0 and 9.5 kW rooms we move to the Bronte, at $3,978.96 and $4,444.79 installed. Both use R-32 refrigerant and carry MHI’s 5 year parts and labour warranty, and both ranges are on MHI’s cash back list.

Multi head systems, one outdoor unit feeding up to six indoor heads, suit older Queenslanders where ducting would mean tearing up ceilings. We quote those after a site visit, and MHI’s SCM multi head outdoor units earn $200 to $400 under the same promotion.

What’s in the installed price

The MHI prices are for a back to back install on a single storey home: the indoor unit on an external wall with the outdoor unit on the other side of it. The scope is the same as our other brands.

• Site assessment and capacity sizing.
• Indoor unit mounted, outdoor unit set on a slab or ground position.
• Insulated copper refrigerant piping and a condensate drain to a safe discharge point.
• A dedicated circuit back to the switchboard with its own breaker, hardwired 240 V supply.
• Refrigerant charge to ARCtick procedure, vacuum and pressure test.
• Commissioning, app pairing, the ARC certificate and the 5 year warranty registration.

Why both licences matter for an MHI install

A split system is two trades in one job. The refrigerant side needs an ARCtick licence, and the dedicated circuit back to the switchboard is licensed electrical work in Queensland. Many installers subcontract one half.

We hold both in house, Queensland Electrical Contractor Licence 90552 and ARCtick L181564, so the same crew does the wiring and the refrigeration in one visit and one warranty covers the lot. Our guide on whether you need an electrician to install air conditioning explains why that matters.

The cash back, and why November is the month

MHI’s Spring 2026 cash back pays $100 on 2.0 to 3.5 kW units, $150 on 5.0 kW, $200 on 6.3 to 8.0 kW and $250 on 9.5 kW, for eligible units bought and paid for between 1 October 2026 and 31 January 2027.

You claim it online with your tax invoice by 28 February 2027 and MHI pays your bank account. We don’t deduct it, because the terms don’t allow installers to. Our guide on the Mitsubishi Heavy Industries cash back has the claim steps.

The practical point is the calendar. The window closes in the hottest fortnight of the year, when install dates are hardest to find. A November booking gets the unit in before the first heatwave with the invoice comfortably inside the window. See the Mitsubishi Heavy Industries air conditioning in Brisbane page for the full range, or compare brands on our aircon prices in Brisbane page.

Common questions about choosing an MHI split system

Is Wi-Fi included?

Yes, the Ciara prices above include the Wi-Fi model, paired to the app during commissioning.

Should I buy a bigger unit so it works less hard?

No. An oversized split system short cycles, which means it blasts, switches off and never dehumidifies the room. Size to the room and let it run.

How long does the install take?

A standard back to back install takes three to five hours. Double storey homes and long pipe runs take longer and are priced as extras before we start.

What does the warranty cover?

MHI gives 5 years parts and labour on the unit, and we add a 5 year workmanship warranty on the installation. We handle MHI warranty service and out of warranty servicing, with a service and clean at $363 for one unit.

Prices current as of 4 November 2026 and include GST. Cash back amounts and dates are from Mitsubishi Heavy Industries Air-Conditioners Australia’s Spring 2026 Cashback terms and conditions, checked 4 November 2026; the promotion is run by MHI, not by Faze. This article is general information. It is not advice about your room, which we size on site before quoting.

Related guides

Air Conditioner Running Cost: Calculate ItMitsubishi Heavy Industries cash back 2026: how to claim $100 to $250 on a split system in BrisbaneAir Conditioner Replacement Cost Brisbane: 7 Key Factors

• Air Conditioner Service Cost: What to Expect
• Best Air Conditioner Brands in Australia

All guides: electrical and air conditioning guides.

Written by the Faze Electrical & Airconditioning team, Woodridge

Licensed electricians and ARCtick refrigeration technicians, Queensland Electrical Contractor Licence 90552 and ARCtick L181564. We install and service split systems and do the electrical across Logan, Brisbane southside, Ipswich and the northern Gold Coast.

About Faze | Call 07 4428 2766 | Text 0489 275 747