The average hvac salary at Northside Isd was $39,442 , which is 29 percent lower than the average salary for this job in Texas, and 29 percent lower than the national average for this job . Hvac salaries at Northside Isd typically range from $33,862 to $47,008 (25th to 75th percentile). The highest reported hvac salary was $55,752. There are 21 employees at Northside Isd with the job title hvac.