听力原文：The simplest way to lower your energy bills is to use less energy, and White Star

Energy can help you do that. Simply call and speak to a White Star Energy expert to schedule a free home energy audit. Our auditors will evaluate how much energy you're using, from air conditioning and water heating to all other home appliances. You'll also receive recommendations for improving your home's energy efficiency. If you're planning to install a new air conditioning unit, our energy auditors can also help you determine the right size for your home. We can also explain how ceiling fans decrease room temperatures by five to seven degrees at a fraction of the cost of air conditioning. To arrange for a free White Star energy audit call five-one-six, five-nine-five, forty-two, eighty-two. Call us today and you'll be on your way to lower energy bills. That number again: five-one-six, five-nine-five, forty-two, eighty-two.

What is learned about the energy audits？

A．They are free of charge.

B．They are offered once a year.

C．They will be discontinued soon.

D．They will become available at the end of the year.