You should not have "a crackling sound" coming from your AC line and if you do, it suggests something faulty in the installation, such as a loose connection. I’d have your electrician check all of his work.
Did you take out a construction permit for this work? In many municipalities in the U.S. such a permit would be required. If so, your code inspector may be helpful in identifying the issue.
Did you take out a construction permit for this work? In many municipalities in the U.S. such a permit would be required. If so, your code inspector may be helpful in identifying the issue.