We've had solar tubes installed in three rooms and may add one or two more. The one in our guest bath is invaluable. Before, we had to turn on the light whenever we used it. Now only at night. The one in the kitchen illuminates a darker area well. We had Solar Guys install ours. Very pleased with them and will use them again if we add more.
The attic fans are questionable as to their value, IMO. Some people believe they reduce the attic temps significantly, but other studies show little change. I have two and am not sure I would do it again, let alone add more.
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"the difference between genius and stupidity is that genius has its limits."
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