The post war housing boom lead to a suburbia populated with ranch houses which were first thought of as unbearably cookie cutter, inspiring the song Little Boxes. They have since become popular again with people who have a yen for mid-century design. With so many new homes on the market, the developers had to be smart about selling them. Frequently they produced films like these to entice buyers. This film was made with women in mind - wives in particular. Jane and her friend Alice (Hunt) conspire to convince Jane's husband George (McGavin) to pony up for a new kitchen by leaving him alone in the old one for a weekend.
This can be seen on YouTube, thanks to an upload by shaggylocks. It's in the public domain so it's fairly easy to locate online. It's almost completely unknown, however.
Obscurity factor: 9 (available on YouTube and elsewhere, almost completely unknown)