The average hvac salary at Dallas Isd was $51,740 , which is 7 percent lower than the average salary for this job in Texas, and 7 percent lower than the national average for this job . Hvac salaries at Dallas Isd typically range from $47,269 to $56,715 (25th to 75th percentile). The highest reported hvac salary was $65,340. There are 76 employees at Dallas Isd with the job title hvac.