The average hvac salary at San Antonio Isd was $41,027 , which is 26 percent lower than the average salary for this job in Texas, and 26 percent lower than the national average for this job . Hvac salaries at San Antonio Isd typically range from $34,867 to $45,880 (25th to 75th percentile). The highest reported hvac salary was $53,990. There are 20 employees at San Antonio Isd with the job title hvac.