Tim Malacarne wrote:Have heard of non-powered automatic vents. Are these the store bought ones you're mentioning?
Charli Wilson wrote:The automatic non-powered ones are like cylinders of wax, when it gets hot enough for the wax to melt then the windows open. You can sometimes buy replacement-cylinders for not too expensive, and fit them onto your own windows/vents.
Amedean Messan wrote:Only problem I see with spinners is thermal loss during winter. They work great during the summer though. A remedy would be to have the option to close off the spinners during the winter months.