indoor When to bring peppers indoors

First year of growing peppers and So far I love it.
My ghost pepper plants are still going strong with lot of new buds and flowers. I am not sure if they will see the light.
 
Temperatures are going to drop to low 40s in coming weeks.
 
So my questions:
1. When should I bring the peppers indoors? TIll what temperatures can the plants survive outdoors(They are in self watering pots which are not easy to move)?
2. I am planning to overwinter at least one of them. So should I go ahead and prune the plant even when there are unripe pods?
 
Please help.
 

They start suffering below 40°. Freeze will kill them.
 
Prune away. Stick the branches in buckets of water. Keep them warm and the pods will ripen. Change the water regularly and the branches will eventually grow roots so you can plant them again next year.

DWB said:

They start suffering below 40°. Freeze will kill them.
 
Prune away. Stick the branches in buckets of water. Keep them warm and the pods will ripen. Change the water regularly and the branches will eventually grow roots so you can plant them again next year.

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Thank you. Do you think 40 - 45 is OK?

Peppers seem to be happiest over 50° but they'll be fine with lows of 40-45.