|He Ain't Heavy, He's Just Irresponsible|
|Season 04, Episode 05|
|Air Date||October 18, 1994|
|Writer|| Elliot Shoenman|
|Previous||The Eyes Don't Have It|
He Ain't Heavy, He's Just Irresponsible is the fifth episode of the fourth season. This episode first aired on ABC in the United States on October 18, 1994.
Tim installs a central vacuum system; Tim's brother Marty comes over to tell Tim that he's leaving his wife Nancy and kids, but Tim's advice turns Marty against him. Meanwhile, Tim creates a hole in the floor installing the vacuum system, and Jill has trouble working on her psychology report.