Similar to Dominick,
We have planted on the south side of our house 7 figs. They are all up against a heated south facing basement wall. After they become mature and hopefully cold harder, we will leave them uncovered for the winter, as a test.
We started testing cold hardy figs about six years ago. At that time we thought we were in a zone 6. But, later found out we are in a zone 5. The micro climants do indeed make a big difference. The ground one foot or more from the basement wall, never freezes.
Hope that helps.
Bob, Zone 5 Connecticut