Consider a solar powered attic fan if you are not ready to make the full switch to solar energy. This type of fan features sensors that can turn on the fan at a certain temperature. This will remove heat and lower the cost of cooling. A good solar powered attic fan will help cool your house and not cost anything to run.
Always use non abrasive cleansers on your solar panels. An abrasive cleaner can scratch the surface of the panel and cause permanent damage and affect how well the solar panel works. There are commercial cleaning solutions to use or you can use a pool skimmer with a very soft cloth on it.
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Don't assume that just because a company sells and installs solar panels means they are good and trustworthy people. Shop around. Get a minimum of three quotes. Read all contracts. Check backgrounds of potential contractors. Deal with this like any other home-improvement project that you would otherwise do.