Browse Forums Heating, Cooling & Insulation Re: Whirlybird air vents 21Jan 07, 2013 10:13 pm interesting, not sure how to take that one! surprised you've not noticed a temperature difference between roofs? have you been in a roof with a powered ventilator? your experience? Slooowwwwly getting a Manhatten 35 in Middleton Grange Re: Whirlybird air vents 22Jan 08, 2013 12:31 am Hi, just like to share my experience. My house has an extension 4mx6m, it has a corrugated iron roof with insulation, then a 300mm air gap to the ceiling. The sun rises on that side, so by mid morning on a warm day, when I stand in the room I can feel the heat coming down from the ceiling and by late afternoon, its like a pressure cooker and I have to turn on the aircon. Last month, I installed a whirlybird and this made a significant difference to the room, the room is very pleasant in mid morning and by late in the afternoon, its reasonable (no aircon, just fan). I must admit my house is on the top of a hill, so it gets a nice coastal breeze that helps to spin the whirlybird, so if its moving, then its sucking the hot air out and drawing in cooler air from the vent. I installed a 300mm bird with 1-2 vents on the eaves per wall. I did the job over 2 weekends, first weekend was for the bird, which made a minor improvement, then I installed the vents and that really made the difference. When installing the bird, you'll need to cut a hole on the roof and after that you'll also cut the same size hole on the insulation, so it can suck air from the cavity. btw, been told by my builder it also helps to remove any moisture building up in the roof cavity, during rain or in the colder months. Apart from my personal time, the installation cost me about $130 (mid level bird $80, 2xpacks of 2 vents $10each, silicone $6 & roofing tape $25). If you drive around or climb on your roof, you'll see them in a number them installed on top of homes and factories, so if its such a myth, so why do so many places install it. What works for me may not work for you, but based on my personal experience, its been a worthwhile exercise and made a significant difference to the room. Good luck with your research and if you need any info, please feel free to PM me. Cheers. Re: Whirlybird air vents 23Jan 08, 2013 6:09 am http://forums.whirlpool.net.au/archive/1062443 http://forums.whirlpool.net.au/archive/1135874 http://www.ata.org.au/forums/topic/1592 http://forums.energymatters.com.au/alte ... c2453.html I can only assume if you have a fair amount of wind going over your roof that you'd get better results than most of the people in those threads Slooowwwwly getting a Manhatten 35 in Middleton Grange Re: Whirlybird air vents 24Jan 08, 2013 8:02 am Two weeks ago we installed 2 x whirlybirds and eave vents, and we've only had to use our aircon once since. They make a huge difference. The only day we used our aircon was on the 40+ degree day. Our house stays nice and cool on the 30+ degree days Re: Whirlybird air vents 25Jan 08, 2013 8:14 am are you in an area that gets a fair amount of wind? viewtopic.php?f=1&t=54890 Anyone used a thermometer to do a before and after? (a dual thermometer so you can get equitable inside and outside temps etc) Funny how much we pay for Maestro's... check out these $100 jobbies http://www.amazon.com/Broan-355BK-Mount ... B003LBCE5E http://www.ebay.com.au/itm/Air-Vent-538 ... 816wt_1163 http://www.homedepot.com/buy/building-m ... OtQrW8yyxw and the Maestro... $400 on SPECIAL http://www.austechshoponline.com.au/mae ... r_vent?b=1 Slooowwwwly getting a Manhatten 35 in Middleton Grange Re: Whirlybird air vents 26Jan 08, 2013 9:46 am MdR2 Not overly, we're on the edge of an estate, fairly flat ground and surrounds, opposite paddocks and a river. We have an almost black tiled roof, so it absorbs the heat, the vents under the eaves help circulate the air through, they have made a world of difference Re: Whirlybird air vents 27Jan 08, 2013 9:39 pm MR2 http://forums.whirlpool.net.au/archive/1062443 http://forums.whirlpool.net.au/archive/1135874 http://www.ata.org.au/forums/topic/1592 http://forums.energymatters.com.au/alte ... c2453.html I can only assume if you hav e a fair amount of wind going over your roof that you'd get better results than most of the people in those threads Yes, I get a nice breeze especially in the afternoon, so that helps. Having said the day that I installed it, there wasn't any breeze, but the bird was still spinning, so I assume that's due to the convectional effect with the hot air rising and turning the bird. As you pointed out from those forums, the result can vary between with different installation. The main thing is to get big air vents under the eaves on the cooler side of the house. I've positioned the vents, so its facing outwards, so air can go in unrestricted. Those Broan units would be better option for house in gully or have little airflow. btw, today is 42c and by the time i got home, the house is cool and the extension was quite comfortable without any fan or a/c. cheers. Re: Whirlybird air vents 28Jan 09, 2013 12:25 am We live in coastal WA and don't have air conditioning. We have six on our roof and we have no noise and am confident they help. They were as cheap as chips to install so we went with it .... better than running air con 24/7! Re: Whirlybird air vents 29Jan 10, 2013 2:57 pm We had 2 in our previous place - about 20 sqs - rectangle shape. Gable roof. Tiles. I'm told they work well with a few vents in the eaves. Never done that - but was told it helps. Ours never made a sound but seemed to be always moving. Re: Whirlybird air vents 30Jan 10, 2013 2:58 pm We had Air/con too - ducted. Thought the whirly gigs worked well. Re: Whirlybird air vents 31Feb 01, 2013 8:33 am think what I'm going to do is install some booster industrial fans under our whirlybird(s), I can get some pretty crazy and quiet fans for $250 each (30cm) have them temp controlled so when the temp in the roof goes past 5-10 deg more than ambient it flips on.. by the same token I'm thinking of using rain storage water pumped onto the roof to do something pretty similar Slooowwwwly getting a Manhatten 35 in Middleton Grange Re: Whirlybird air vents 32Mar 09, 2013 8:00 am Re the vents - are they easy to install - ie like an outlet in a ceiling in the bathroom. Or is there more to it ? Keep in mind - I'm more of a handyman's handyman ... retail its around double the price of a similar sized actron/dakin system from memory, They are excellent systems though. But with how builder gouge on AC/heating, you… 4 13791 How do you remove one of these ceiling air con vents? And is it possible to disconnect the duct joined to the vent from inside the house, without going into the roof cavity? 0 5947 Hi all, sorting out the ducted air con for a 350sqm double story house. Does this placement sound reasonable to you? Also, I plan to have 6 zones I think. Living room… 0 0 |