Performed diagnostic on Attic fan. Client stated they just a couple days when it was warmer attic fan had turned on with a loud clanking noise and was concerned that something may have been wrong with it. Found attic Was working properly and tested. Motor ran smoothly and no noise. The loud noise could have been due to its sitting for a while and randomly coming on recently. Ultimately nothing seemed out of the ordinary or deficient. Also need to reschedule maintenance for air-conditioning do to it raining at the moment. Upon departure System is operational