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My whole house attic fan has a three way switch in the house. In the late fall I cover the fan with an insulation blanket to keep heat from escaping from the house into the attic. As a safety device, I installed an on/off switch in the attic as well. This year I failed to toggle it to the off position. Sometime this winter the switch in the hall got toggled to high speed. The blanket was keeping the fan from spinning….