marjo,
In our hoophouse, we have three zones. The heated South side has heat from the wood outdoor furnace that comes on around 50 - 55 degrees. The North side gets residual heat from the South and rarely gets below 30 degrees. The addition built last year, mainly for figs has no heat at night and the temp drops to about the same as outside.
The addition is on the East and heats up quickly on sunny mornings and can get over 70 degrees. The South side takes a little longer to receive the sun but heats up immensely because of the smaller size. If I am not available to open the divider doors to the North, it can surpass 95 degrees. The North is more moderated, and the fig trees in there go dormant. This is the first winter for in-ground trees on the South, but it looks like they are going to hold most leaves, not sure about all the figs on the King.
Despite the high temps, the trees that go dormant have bounced back just fine in the Spring and wait until then to leaf out. Sometimes ones in pots leaf out early, but it hasn't been a problem, if extra cold comes, I just move them to the heated side for a few nights.
I expect yours will do fine despite the drastic temperature shifts. I have been surprised at how well mine have done despite that situation.
Trees in the addition died back to the ground last winter, but roots survived without protection, except for one that died. Those grew spectacularly this year and I have added root protection in the form of straw for a little more insurance.