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520 posts

Ultimate Geek

  # 2290092 5-Aug-2019 10:28
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with the indoor units the db ratings differences are so minimal between leading brands its almost insignificant as a deciding option as youre not going to notice a 2-3db difference



Focus on the noise ratings of the outdoor units and the size of the fans operating them, outdoor units are mostly noticed on back to back installations so be wary of where the outdoor unit goes.



the most important ratings (IMO) is the COP rating which is how much heating it produces for the amount of electricity it uses.



A while ago when I was looking into systems to warm our home some of the differences were insane, between 2.5 - 4.5!



We ended up with a mitsi ducted system and an additional panasonic high wall to help assist heating the living/dining/kitchen area both do a great job



Obliviously the better the efficiency the more they cost but if your plan is to be in your home long term then it makes sense to spend the extra



We had a daiken system installed into one of our rental at the beginning of winter and the feedback from our tenants is that its good, quiet and the electricity bill has only gone up slightly which is expected in winter, saves me money from sending a load of firewood around each winter too :-)


1047 posts

Uber Geek

  # 2291862 7-Aug-2019 18:52
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Careful positioning of the external unit is important for the neighbours too. Installers like back to back installs as they're cheaper and easier, but most units can be installed a huge distance from the indoors unit or on the roof if need be. They should never be placed near where you sleep and you need to think twice before having them face a neighbour's house at close quarters.



Mitsubishi Electric and Mitsubishi Heavy Industries are two separate companies despite the similar names. Mitsubishi HE is popular in Australia but not so well known here (their website is ). They do have some good units in certain niches.



The headline specification in New Zealand has been the heating kW but in Australia it's the cooling kW which is nearly always smaller. Many Australians either buy units that can't heat or never use the heating feature. With heat pump related marketing and web presence in New Zealand being run out of Australia they've taken to calling them "air conditioners" and advertising the cooling kW as the rating. So don't confuse the two.



The high walls are updated often but the floor consoles and multisplits aren't. The Mitsubishi Electric multi is dated compared with the new R32 Daikin but they should be more evenly matched when Mitsubishi updates theirs. Sometimes you need to search the model name of a multisplit outdoor unit to find full specifications. They will offer a choice of different indoor units to use and some of those are more efficient than others.


4859 posts

Uber Geek


  # 2291888 7-Aug-2019 19:34
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If I said "HeatPump" to someone here in Melbourne I'd get a blank stare. "Reverse Cycle Air Conditioner" most people would understand, but it's still very common here for people to have evaporative cooling (yuck) and gas heating rather than heatpumps, even for new builds.

When I bought my house (new build), it had the big HeatPump downstairs in the living area and central gas heating, but no cooling upstairs in the bedrooms, which is why I put a 3x multispit in. With them off in summer, upstairs can easily get to mid-30s on a mild day.

I do still use the gas a lot in winter. It can heat the entire house very fast and moves air around better than the HPs - you just can't close doors.

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