People in this group work for heating systems installation/service companies, appliance service companies, electrical/other repair shops, electrical equipment manufacturers service shops, maintenance/repair departments of retail, wholesale, and manufacturing companies, motorcycle dealerships, and independent service organizations. They may also be self-employed.
Here are the average annual salaries.
2010: $41,309
2005: $35,173
2000: $25,836
1995: $24,590