Find out what kind of warranty comes with any system you are considering. A solar energy system should last you for at least twenty years, so be sure the company you are dealing with can support it. If there is no warranty, or an extremely limited one, it may be time to keep looking, no matter how great the savings are.
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One of the major benefits of solar energy is that it is renewable. The sun (generally) shines each and every day, and there is no reason to worry that drawing power from the sun will somehow render it unusable in the future. Using solar energy, therefore, is a safe and reliable way to power the Earth.
Consider changing out your windows when you install a solar energy system. Installing energy efficient windows will help your home be easier to heat and cool, maximizing your energy savings. Since you will now be providing your own power, it is a good idea to save energy wherever you can.