How to dry fruits without sunlight or a dehydrator?
The key to drying fruit is not temperature, but humidity - or rather, lack of humidity.

If you want to avoid mold,you need to speed up the drying process. And for that, you need to keep a few points in mind: 


Place fruit in a single layer, not touching each other. Ideally you would place them on some sort of "drying rack", which could be either some kind of screen on a frame or even some metal mesh like the ones used for cooling cakes. This ensures that they can dry from all sides. Otherwise, turn them regularly.
Maintain a dry environment. If in doubt, always choose a cooler, but drier place over a warmer, but more humid one. 
If available, constant air flow can speed up the process considerably. Perhaps a fan could be placed nearby?
If necessary, fruit can be dried in an oven, but at the lowest heat possible (40 to 50 C should be fine, use the oven fan, if you have one) and with the door slightly ajar.