a few years back a roofer installed what I think is called an attic ventilator...motorized fan on roof that operates off thermostat. (I think he replaced a turbine that wasn't motorized but moved when the wind blew.)
Now the motor had died.
Should I replace this?
I have read that sometimes these can create negative pressure in the house. I've also read that they don't help lower the temperature in the attic. Sorry if this isn't an HVAC question.