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pretty sure there isn't one?

I think that's it.... doesn't stop the gusts of wind blowing in tho

well there are obvious downsides. I actually have one in my house, no idea if it does anything... can you stop it in winter somehow to stop it extracting all the heat?

I honestly can't recall, it was so long ago, the message I took from it was whirlybirds were a con. this article touches on the sorts of issues covered: http://sidthoo.com/2012/06/16/does-roof-colour-affect-the-energy-efficiency-of-my-house/

there was a thread on here a couple of years ago where I got completely shot down re whirlybirds. Apparently the heat in you roof has very little to do with inside your house. Will see if I can find the thread