The Solar Guys installed a solar fan for us in early 2005. Last year the motor bearings went out and it was howling like a wounded animal. Solar Guys honored the Mfr 5 year warranty and replaced the fan motor quickly and with no charge. Normally the solar fan is very quiet and on occasion I have climbed up on the roof to see if it's really working. The solar fans may not move as much air as a wired fan but it does the job and you can feel the difference in the attic when it's running.
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