For better savings on your utility bill, keep your solar panels clean. Solar panels are practically silent and since you don't touch them, you can easily forget them. The cleaner their glass panels are, the more clear surface area the sun has to "work with." There's no set amount of time that you should clean them. If you live in an area with lots of wind, dust or construction, they may need cleaned frequently. Some ares may require weekly cleanings.
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If you're trying to design your new house, think about putting in a bunch of big windows on the home's south side so that during the winter you can get a lot of sun. Make sure you have methods in place to keep excess heat out during the warmer summer months. For more help, consult a contractor who specializes in solar energy.