The average hvac salary at Richardson Isd was $40,137 , which is 28 percent lower than the average salary for this job in Texas, and 28 percent lower than the national average for this job . Hvac salaries at Richardson Isd typically range from $38,232 to $42,220 (25th to 75th percentile). The highest reported hvac salary was $49,361. There are 13 employees at Richardson Isd with the job title hvac.