GRAND JUNCTION, Colo. -- We've all heard that making our homes more energy efficient can save us money. An energy audit can show you exactly where those nickels and dimes are seeping out of your house.

The technology has been around a long time, but it's taking off with the push to go green and everyone trying to cut back on spending where they can.

Homeowner Vicki Chandler's house was built in the 1930's, so she wanted to have an audit done to make it more efficient.

"Being an older home I knew it probably had a lot of air coming in or things I can do better," Chandler says.

During the audit, a consultant asks a series of questions about the house. Then, he uses a giant fan to suction all the air out of the house.

The pressure is higher outside the house than inside, so air will start to seep in through holes.

"We're looking for outside air infiltrating the house," says auditor Rick Horne.

Horne uses a smoke pencil that shoots out little puffs of smoke and an infrared camera to show where outside air is creeping in--and adding those extra pennies to Chandler's electric bill.

"I learned that there's more air coming in than I thought!" Chandler says.

Leaks aren't always in the obvious places like windows. Air leaks in around light fixtures, ceiling fans and even electrical outlets.

Horne says that's why the audit is helpful.

"Instead of just guessing to what the problem is," he says, "people should get an audit so they know the facts."

He says making changes in such specific areas can also mean huge changes for your wallet. Some customers end up saving up to 40 percent on their utility bills.