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563 posts

Ultimate Geek
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Topic # 151534 28-Aug-2014 14:44
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Looking at installing a DIY heat transfer kit like this: http://www.mitre10.co.nz/shop/heating_cooling/heat_transfer_kits/aerlite_heat_transfer_kit_2_room_172293/

.
..in order to move warm dry air from hallway through ceiling into bedrooms approx 4-5m away.

Happy to get up into the ceiling myself to install ducting etc but will obviously need a sparky to actually wire the fan up in the ceiling and the wall controller in the hallway.

What do I need to know in terms of getting it ready for an electrician and how much should it cost?

(90's house maybe, single story, ok ceiling access, normal switchboard outside about 15m of cable away..)

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3267 posts

Uber Geek
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  Reply # 1117349 28-Aug-2014 16:39
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Not helping with your question, but I have a suggestion for your installation.

Unless you have a concentrated heat source (unlikely in a hallway), you should rather suck air out of the bedroom so that warmer hallway air moves through the door into the bedroom.  Otherwise the air will cool down too much through the ceiling even with insulated ducting.  This also has the advantage that you do not get noise in the bedroom from air blowing into it (but you do get noise where it exhausts).  You can do this with the kit, just fit the fan the opposite way round.

Before drilling holes, think about the air flow so that you will move air across the the room, i.e. don't place the vents by the door or else it will not actually spread through the room.

I did it the normal way in our old house and could measure the temperature drop across the ducting, and I've done it this way in our new home and measure only a marginal temperature drop (since heat will still leak out the bedroom windows).




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563 posts

Ultimate Geek
+1 received by user: 89


  Reply # 1117689 29-Aug-2014 08:08
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Good considerations however I would be cautious about creating a negative pressure in the bedrooms and causing cold air to flow in through window cracks etc.

Our hallway is fairly small and has a very large panel heater that easily heats the hallway+bedrooms when doors are open so just want to be able to close them and have the same effect.

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