Heating, air conditioning and refrigeration mechanic and installer

What they do: Maintain, repair, and install heating systems, air-conditioning systems, or refrigerators.

Salary range: $24,240 to $61,390

Education/experience: On-the-job training, although the complexity of the new systems require technical school training or apprenticeships.

Growth forecast: With the development of energy-saving air-conditioners and refrigerators, the need for mechanics and installers is expected to increase in the next 10 years by 9 percent, according to the BLS. In addition, laws passed in the near future may further encourage homeowners and businesses to purchase new, more energy-efficient products.