Turbines work on convection where hot air rises and turn the head,
wind isn't required. The roofer that installed ours in the garage had
his hair raising when he cut through the roof to install it. Garage
temp went from 10° above outsdide slab to 10° below with turbine.

On 18 Aug 2006 05:31:00 -0700, "
wrote:

turbines dont do anything without wind

higher overall energy bills and possibly moisture trobles in attic will
result.......

very bad idea, and probable home inspection issue atr resale.

besides the cost of patching your tile roof, anything you do will be
either costly or obvious or both