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timmmay
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  #453404 30-Mar-2011 10:01
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Adappted: IMO these attic to lounge systems are a total scam racket. I should know as I got taken by one.. They are so intensely scammish I will not say the name as their goons might come after me. We can't use ours anymore as neighbors burn fires and our house was filling up with smoke from outside! Their suggestion? Get a system that fills your air with plasma gas to counter the smoke. In the end we caved and got a Fujitsu heat pump. The thing is awesome, cools and heats the entire house AND it dries the entire house with it's "dry" function. I no longer rage over getting scammed, now I just consider it a life lesson.


To be fair you can't really blame them for your neighbours having fires and your roof cavity filling with smoke. A few of the houses in my area have fires, I can smell it outside, but I can never smell it inside. I guess my roof cavity just doesn't get it, by good luck.

The roof cavity systems are really good for bringing warm air into the house on sunny days, even in winter it increases the house temp by 2-3 degrees on sunny days, and drives out dampness. Even my little cheap one does the job ok, even if it is too loud to leave on at night.

TinyTim
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  #453406 30-Mar-2011 10:10
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timmmay:
The roof cavity systems are really good for bringing warm air into the house on sunny days, even in winter it increases the house temp by 2-3 degrees on sunny days, and drives out dampness.



 

Out of interest, what is your roof made of? I've measured my roof cavity at 10 degrees on a clear sunny day in July, and I simply don't want that cold air in my house! Our roof is corrugated iron over sarking, and I assume the sarking adds enough insulation that it doesn't warm up much. (My parents in law have no sarking and it can get very hot in their roof.)




 

 
 
 
 


timmmay
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  #453412 30-Mar-2011 10:28
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Corrugated iron/steel. There's some kind of paper or something under the steel.

On really cold winter days sometimes it's not really that helpful, but it's always warmed in the ceiling cavity than outside. I have one of those remote temperature monitor things, with a sensor inside and a sensor in the ceiling cavity, so i'll have better data about winter temperatures in the next couple of months.

Right now when I come home on a sunny day it's 21 degrees inside and 23-27 degrees in the ceiling cavity. In the morning it's usually 16 degrees inside and 10-12 degrees up there. Incidentally my heat pump is in the shed until some work outside is finished :(

Also, my F&P fridge varies from -1 to 4 degrees, depending on where in the fridge you put the sensor, and how recently the door's been open. I like the remote sensor things! I kindof want one with multiple units so I can monitor the inside, ceiling cavity, outside, fridge, and AV cabinet!

South45
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  #455003 4-Apr-2011 09:28
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Interesting comments. I'm down south where I used to work for some companies. They do work but it's more to do with the house than the system.

Just find someone who will tell what they will or won't do relating to your house, your roof, your roof surface, your roof pitch, your roof exposure. Once again the one with the most airflow and a really smart control system is what you want.

If you only had three hours during the day where it's warmer in your roof than your house, would you rather have 9-10 airchanges bringing in warmer air or just 3. It's obvious isn't it, and therein lies the answer. If it's the higher figure it doesn't need to be pumping cold air in during nightime like the others do does it!


Jaxson
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  #455419 5-Apr-2011 09:41
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South45: If it's the higher figure it doesn't need to be pumping cold air in during nightime like the others do does it!

  The problem with high humidity causing moisture on the windows etc is most likely to occur during the night when the house is totally shut up for a long period of time and it's at it's coolest outside.  Having made 9 - 10 or just 3 air changes at 6 o'clock in the evening is irrelevant at 3am in the morning.  So yes, you do need some air changes during the night period regardless of how many you were able to achieve earlier on in the day.

Albert53
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  #455423 5-Apr-2011 09:54
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With a system running 24/7 the home will be drier so air changes during the day will have an effect at 3am as the moisture in the home will be lower. You may still get condesation or misting dependant on how cold it is outside and the inside temp.

South45
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  #455852 6-Apr-2011 11:44
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Jaxson:
South45: If it's the higher figure it doesn't need to be pumping cold air in during nightime like the others do does it!

  The problem with high humidity causing moisture on the windows etc is most likely to occur during the night when the house is totally shut up for a long period of time and it's at it's coolest outside.  Having made 9 - 10 or just 3 air changes at 6 o'clock in the evening is irrelevant at 3am in the morning.  So yes, you do need some air changes during the night period regardless of how many you were able to achieve earlier on in the day.



You might with your system. I'd only ever get a wee bit of misting if it drops below 3 degrees, so what system do you use that needs to pump cold air in all night?

If you don't use one, don't comment as it's just a rant.

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