Videos are kind of a pain. You have to upload them to Youtube then insert the link.
As far as temp goes. The theory is that chicks can withstand a 5 degree decrease in temp per week of age down to 75 degrees then they are good. At the same time, those chicks have mom to go to when they get cold so I wouldn't worry to much. If it were me, I would put mom and babies somewhere that I could put a heatlamp up for them to go under as they want it. You will be surprised but momma will have those babies out a lot earlier than we do.