Can i add apple care+ to these?
Uh…doesn’t look like it. The ad seems emphatic about just the 90-day warranty.
What does refurbishment entail? Are the ear-pads new, or is there a chance of hair from previous users?
Do these come with a charging cable? (And am I willing to buy another lightning cable accessory when Apple is sooo close to dropping that thing?)
The ear-pads were replaced by Apple and the units were thoroughly cleaned. NO CABLES are included with the units.
So are these refurbed by Apple themselves?
The title says “factory reconditioned.”
I’m ignorant as to whether “factory reconditioned” means an Apple factory or a third party factory, which is why I seek clarification.
Here ya go, have some education! 
Can these be returned if not satisfied?
Yes. You have a 30-day return period.