Mitsi vs Fujitsu Ducted Sytems, Advice please

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mrhaboobi

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#324175 9-Mar-2026 16:17

Looking at Mitsi and Fujitsu systems via a couple of different installers in our region ( chch ) .

Mitsi seems to be more cost.

Looking

Mitsubishi Electric PEAD-M100JAA (10.0 kW Cool / 11.2 kW Heat)
Fujitsu ARTH30KMTAP-HP (8.5 kW Cool / 10.0 kW Heat)

Some installers are suggesting the ARTH30 and others the 36. All mitsi are the M100.. Its a 150 SQM property.

Keys are Wifi ( to control the unit ), Noise ( has to be bloody quiet in all aspects, indoor unit, outdoor unit etc ) . Future Ventilation Support a bonus

Whilst i would also Love zoning, ( and only want two zones , front of house and back of house where i could set different temps ) i feel like the Airzone is overpriced for the simple use i would need, and the other zoning options from mitsi are On/Off rather than temp controlled. ( new zoning system with temp control coming? ) Fujitsu maybe has a zone controller but not sure if its temp based or just on/off control. and one temp for whole house?

Interested in peoples thoughts on the two systems, what are the gotacha's?

THanks

tweake

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#3468180 9-Mar-2026 19:45

first thing is the units seam to be a tad small (that would do a smaller house in auckland), which is a bit odd as many installers will oversize the systems.

i suggest finding the calcs and working out what size you need. summer is the hard one to work out due to solar gain. a lot of it will depend on what sort of house it is, what windows it has and what direction they face.

Stu1

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#3468182 9-Mar-2026 20:12

I would say too small, a couple of sites have told me at least 16kw same size house

https://winterheatpumps.nz/pages/heatpump-selector

mrhaboobi

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#3468185 9-Mar-2026 20:17

16kw feels very large. Something not right there. Bdt suggested the same size when I asked them. About 6 companies also all suggested the same mitsi unit so can’t imagine 16kw being needed. Our 245 m2 property had a 16kw daikin so 150m2 not going to need that large.. I’d double check the sites that are suggesting that.

tweake

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#3468187 9-Mar-2026 20:25

mrhaboobi:

16kw feels very large. Something not right there. Bdt suggested the same size when I asked them. About 6 companies also all suggested the same mitsi unit so can’t imagine 16kw being needed. Our 245 m2 property had a 16kw daikin so 150m2 not going to need that large.. I’d double check the sites that are suggesting that.

what sort of house is it? year? windows, insulation etc ?

Stu1

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#3468190 9-Mar-2026 20:28

mrhaboobi:

16kw feels very large. Something not right there. Bdt suggested the same size when I asked them. About 6 companies also all suggested the same mitsi unit so can’t imagine 16kw being needed. Our 245 m2 property had a 16kw daikin so 150m2 not going to need that large.. I’d double check the sites that are suggesting that.

I just checked an old quote suggested was 14 heating and 12 cooling.

mrhaboobi

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#3468191 9-Mar-2026 20:28

tweake:

mrhaboobi:

16kw feels very large. Something not right there. Bdt suggested the same size when I asked them. About 6 companies also all suggested the same mitsi unit so can’t imagine 16kw being needed. Our 245 m2 property had a 16kw daikin so 150m2 not going to need that large.. I’d double check the sites that are suggesting that.

what sort of house is it? year? windows, insulation etc ?

245 sqm was 2013 built, fully insulated double glazed rib raft foundation. Has 16kw daikin
145 sqm is 2020 built, fully insulated, concrete foundation, double glazed, integra panel /render walls.

both chch based

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networkn

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#3468193 9-Mar-2026 20:29

The after sales experience we had with Fujitsu both inside and outside warranty means they will never see another dime of my money.

mrhaboobi

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#3468195 9-Mar-2026 20:31

networkn:

The after sales experience we had with Fujitsu both inside and outside warranty means they will never see another dime of my money.

thank you, that says a lot .. was it dealer or the hardware and Fujitsu issues?

timmmay

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#3468197 9-Mar-2026 20:33

Have you read the ducted heatpump guide? I wouldn't have a ducted system without zones, at least north / south. I'm not even sure I'd have a ducted system if I moved house, I might have multi-split or individual units for simpler control. The big problem we have with the way our house is laid out and where vents are is the lounge gets cold when we really only want to cool the bedrooms.

tweake

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#3468208 9-Mar-2026 20:59

mrhaboobi:

245 sqm was 2013 built, fully insulated double glazed rib raft foundation. Has 16kw daikin
145 sqm is 2020 built, fully insulated, concrete foundation, double glazed, integra panel /render walls.

both chch based

i would be inclined to run it through the middle of the road calcs (i forget who has the free ones). they take window sizing into account. the quick sizing tools don't. otherwise you pay someone to do a proper load calc.

it may be the local guys have better weather knowledge than what's officially recorded. that can happen. eg if your in a warmer spot than where the weather station is.

you probably have seen the pages of horror stories already. imho the install is what makes or breaks it more than the brand.