This task should be performed at least once a year. It’s simple. If you have a garage door opener, with the door in the closed position, disengage the opener by pulling the red handle on the release rope. Manually lift the door about 1/2 way up. If balanced – the door will not fall closed or quickly jump open during the test.
The steps performed during a routine furnace inspection can vary, depending on the company you hire, but as a general rule, you should expect that an experienced professional will include the following tasks: