I'm in zone 6, with just 4 sunlight hours average. It wouldn't make sense for me to purchase solar at my location when there are still many homes in AZ that don't have it.
There seems to be no reason why those in Phoenix would not have solar. It would pay for itself extremely quickly. Even if the system were financed, I bet a person could be cash positive on the payments due to the offset utility bill.
Quote:
Originally Posted by Xist
Inyokern is the only city rated higher, just a bit, at 7.66. They have an average high temperature of 80.833ºF. The average high temperature in Phoenix is 86.75ºF.
More sunlight, but less heat?
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Just a guess, but Inyokern is at 2500 ft elevation compared to Phoenix at 1100 ft. Holding all other factors equal, less sunlight will be filtered out by the atmosphere at higher elevations.
The elevation difference alone would account for 5 degrees cooler temps in Inyokern (assuming 4 degree drop for every 1,000 ft)