While I have not installed it I did consider it. What kept me from pulling the trigger is there are two other lower cost options to save. Attic ventilator and insulation. I did both myself. Because I never had a cooling bill without these improvements I can't tell you how much I saved. I did locate an insulation savings calculator that estimated 21.60 in annual cooling saving going from r30 to r50. It will barely pay for itself and only because l DIY.
The fan will likely pay for itself because diy and I sought out a low wattage fan that is non solar. The critics will disagree but 10am to 10 p.m. 100% operation beats solar at varying rates of operation depending on Sun intensity and angle. I get this for 34 watts in a thermostat controlled situation. I can tell you the cost of electricity, 3.8 cents per 12 hours of operation. It drops the temp at least 10 degrees in the attic.
Edit to add most power ventilators use 10 times the electricity the one I used.
Last edited by Toymeister; 06-22-2017 at 09:21 PM.
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