The average hvac salary at Weslaco Isd was $42,533 , which is 23 percent lower than the average salary for this job in Texas, and 23 percent lower than the national average for this job . Hvac salaries at Weslaco Isd typically range from $35,228 to $43,691 (25th to 75th percentile). The highest reported hvac salary was $76,944. There are 16 employees at Weslaco Isd with the job title hvac.