Be realistic about the costs of having a solar energy system. If you're paying much less than other systems that are around the same size as yours, you may have poor equipment or installation work. Like with many things in life you get what you pay for. Quality installation work and equipment isn't going to be cheap. You may have substantial savings by going with a large company, but other companies may be cutting corners to keep costs down.
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Solar water heaters have been around for hundreds of years. For over 50 years people have been using them to heat everything inside and outside the home. Over the years, these solar water heating systems have become much more efficient. If you are located in sunny areas of the country, you should look into buying a solar water system.
Before purchasing solar panels, check the track record of the company that is selling them. Many panels come with lengthy warranty periods of up to twenty five years, but this warranty is only good if the company is still in business. Make sure to ask how long the company has been in operation and check ratings with organizations like the BBB before making your purchase.