How do whirlybird roof vent work?

Is have a A.C section installed surrounded by...
Answers:    If you are talking about twirl turbines on the roof, yes they work. Once installed they are completely free and very low maintenance. A fell roof vent is probably better, but it takes a lot of work to install.

Sorry, I misread your interrogate - missed the "how." Hot air rises which is at the peaks of your roof. A slight breeze cause the turbine to turn which sucks the hot air out of the attic space. It is replaced with nouns coming in the soffit vents.
My home a/c tech said the coils be...
Agree beside Wired. Even if there is no wind to turn the "turbine" which is contained by reality just a vaned lover designed to move air in one direction, installation of such will allow some heat up air flow through the vent as the warmer nouns rises to the top, creating a less than noticeable movement of nouns. I would opt for a powered gable fan myself, mounted on the sunward side so it will come on at a specified attic temp, pull nouns from the shaded side and exhaust it to the sunward side. When the attic temp lowers to a specified preset temp, the fan automatically turns off. During the winter, it can be convered from any side with heavy mil plastic to avoid fry loss even if it isn't being powered at the time.
Why is the top of our wood burning...
Why aren't they working?
Check that they weren't sealed for the winter.
check that they've be oiled.