The average hvac salary at Austin Isd was $49,669 , which is 11 percent lower than the average salary for this job in Texas, and 11 percent lower than the national average for this job . Hvac salaries at Austin Isd typically range from $44,158 to $53,030 (25th to 75th percentile). The highest reported hvac salary was $65,000. There are 20 employees at Austin Isd with the job title hvac.