The average hvac salary at Harlingen Cisd was $31,970 , which is 42 percent lower than the average salary for this job in Texas, and 42 percent lower than the national average for this job . Hvac salaries at Harlingen Cisd typically range from $22,780 to $37,980 (25th to 75th percentile). The highest reported hvac salary was $41,860. There are 14 employees at Harlingen Cisd with the job title hvac.