Panasonic vs Mitsubishi ducted heat pump and ventilation solutions

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#3315139 2-Dec-2024 13:08

Fan speed control isn't sufficient to eliminate spill. You may still have one room that needs only a very small amount of heat, if you give it the whole minimum output of a large heat pump it's going to overheat.

Spill or bypass is unfortunately necessary.

AlDrag

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#3315783 4-Dec-2024 07:31

Ok I really wanna finalise this today. I have a big problem with doing too much research and hesitating.

So unless someone says otherwise? Even though my house isn't most likely "airtight", ERV is the option to go with, due to being in the humid city of Auckland?

And to deal with humidity from showers/kitchen, I assume the addition of ventilation from an aircon inlet and lossnay inlet (downstairs in the kitchen) will allow the existing bathroom extractor fans and rangehood to perform much better? Even if they aren't directly in the same room?

I'm still trying to decide if airtouch5 is worth it. Our house is pretty small and I assume the internal walls aren't even insulated. But 1 side of the house does get hotter than the other throughout the day.
Mitsubishi does have zone control, but it only allows turning on/off the dampers.

Our attic gets really hot, so worried about the efficiency of the entire system during the day....but I guess it won't be used during the day that often....

timmmay

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#3315787 4-Dec-2024 07:47

I wouldn't have a ducted system without individual room temperature control. If you don't have that, and your air conditioning, one side of the house will be too cold and the other will be too hot. If you're going to do ducted, do it properly.

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#3315789 4-Dec-2024 07:52

timmmay: I wouldn't have a ducted system without individual room temperature control. If you don't have that, and your air conditioning, one side of the house will be too cold and the other will be too hot. If you're going to do ducted, do it properly.

Right. Cool. Airtouch 5 locked in then (with bypass damper).

One thing I'm confused on, is how to control the lossnay if I have airtouch. I guess it'll just be a set fan speed?

timmmay

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#3315791 4-Dec-2024 08:15

I can't help with Lossnay, best talk to your installer about the details.

tweake

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#3315942 4-Dec-2024 17:04

AlDrag: Ok I really wanna finalise this today. I have a big problem with doing too much research and hesitating.

So unless someone says otherwise? Even though my house isn't most likely "airtight", ERV is the option to go with, due to being in the humid city of Auckland?

And to deal with humidity from showers/kitchen, I assume the addition of ventilation from an aircon inlet and lossnay inlet (downstairs in the kitchen) will allow the existing bathroom extractor fans and rangehood to perform much better? Even if they aren't directly in the same room?

while i disagree with using erv/hrv in non-air tight houses, because you want the integration with the heat pump, then yes i would go with erv. but remember you need a way to monitor the homes humidity and at worse end up buying a dehumidifier.

i would not use the bath fans, i'm not sure what would happen with both bath fan and erv exhausting from the bathroom at the same time. i would have to go ask someone about that.

IF you can get a duct downstairs then yes the range hood will work a tad better (depending on a lot of factors, you probably won't notice any difference) and you will get some much needed ventilation downstairs.

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tweake

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#3315948 4-Dec-2024 17:06

AlDrag:

One thing I'm confused on, is how to control the lossnay if I have airtouch. I guess it'll just be a set fan speed?

lossnay should come with its own controller. not sure of the heatpump controller can do both. its really only the bypass damper that needs controlling. once you set the speeds they never need touching.

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#3315969 4-Dec-2024 18:13

tweake:
while i disagree with using erv/hrv in non-air tight houses, because you want the integration with the heat pump, then yes i would go with erv. but remember you need a way to monitor the homes humidity and at worse end up buying a dehumidifier.

i would not use the bath fans, i'm not sure what would happen with both bath fan and erv exhausting from the bathroom at the same time. i would have to go ask someone about that.

IF you can get a duct downstairs then yes the range hood will work a tad better (depending on a lot of factors, you probably won't notice any difference) and you will get some much needed ventilation downstairs.

I assume the bathroom air would be pulled towards the vent with the most pressure but also what's closest to it.

So if an ERV has a permeable core, what happens to the moisture in a bathroom when it's venting?

tweake

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#3315975 4-Dec-2024 19:13

AlDrag:

So if an ERV has a permeable core, what happens to the moisture in a bathroom when it's venting?

the moisture goes through the core into the incoming air stream and goes back into the house. as i mentioned before erv's keep outdoor moisture out, and indoor moisture in. now don't panic, the house volume of air will soak up that moisture just fine. however you do need to monitor the indoor humidity and make sure it doesn't go to high. worse case is you buy a dehumidifier.

on the plus side, your keeping outdoor humidity out and thats by far the greater amount of moisture.

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#3315987 4-Dec-2024 21:05

Right....I don't even know if I have the option of turning off the ventilator due to having Airtouch5. ugh.

Also, been living in our new house for almost a week now. Loving it, but jesus the sound proofing between each room is pathetic. I think this is due to the large gaps under the doors.
So tempted to now get return air ducts per room and do something about the gap under the doors. Last thing I want to do is keep everyone awake when gaming in my spare room at night or something...I guess I could just get headphones.

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#3315988 4-Dec-2024 21:13

AlDrag:

Right....I don't even know if I have the option of turning off the ventilator due to having Airtouch5. ugh.

is that a problem? you don't turn it off (except for service).

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#3315989 4-Dec-2024 21:20

Maybe there's no insulation in the walls for noise dampening?

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#3315991 4-Dec-2024 21:26

tweake
is that a problem? you don't turn it off (except for service).

Oh sorry, I just figured you sort of meant that if the humidity does get too high, then turn off ventilation. But I guess you're implying that a dehumidifier would be the only option in that case.

timmmay:

Maybe there's no insulation in the walls for noise dampening?

Most likely not. Pretty sure the building code doesn't require it and doing some reading, apparently the majority of building companies don't bother with internal insulation 😢

But we lived in a 70s home which I assume had no internal insulation, it was waaay quieter. But maybe the walls were just thicker, plus maybe being less airtight helped reduce echo etc?
The old house also had doors that touched the carpet, so I'm thinking that might be the main contributor.

I can understand why they undercut the doors, as it does allow fresh air to circulate. Sleeping in our old house with the door closed was unbearable once we woken up.

tweake

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#3315994 4-Dec-2024 21:33

AlDrag:
Oh sorry, I just figured you sort of meant that if the humidity does get too high, then turn off ventilation. But I guess you're implying that a dehumidifier would be the only option in that case.

yes. if humidity goes to high you would need to run a dehumidifier. unplugging the ventilation is ok for an emergency (or turn it off on the controller). there is just no need to turn it off as far as normal usage goes.

AlDrag

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#3315996 4-Dec-2024 21:40

tweake:

yes. if humidity goes to high you would need to run a dehumidifier. unplugging the ventilation is ok for an emergency (or turn it off on the controller). there is just no need to turn it off as far as normal usage goes.

I guess if someone ran a super hot shower for 30 mins without running the extractor fan, all that humidity would fill the house.

So the impression I'm getting, if I don't have a dehumidifer, is that with an ERV, we are able to have a dryer home, as it avoids bringing in Auckland humidity from the outside, but you run the risk of appliances in the house circulating humidity everywhere. Can get the humidity get too low?

HRV will always maintain the same humidity as outside, but probably a little lower due to the a/c. But obviously humidity won't get as low as ERV. I assume no where near as low.

Is this accurate? Sorry if I'm slow in understanding.

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