The average hvac salary at La Joya Isd was $34,936 , which is 37 percent lower than the average salary for this job in Texas, and 37 percent lower than the national average for this job . Hvac salaries at La Joya Isd typically range from $31,583 to $36,463 (25th to 75th percentile). The highest reported hvac salary was $48,566. There are 17 employees at La Joya Isd with the job title hvac.