Looking for tips and suggestions on keeping my girls alive this winter. It's my first year, do I really need a heat lamp? I have 6 barred rock in a 4x 7 coop. I use a metal water can, so I plan on using the heated water base. The coop is on the ground with a sand base. I don't plan on putting a lamp in to keep them laying but that thought has not been finalized yet. Do I need to Vaseline their combs and waddles? I just don't want to find frozen chickens come February.