Should thread into the same holes, unscrew the cups - screw in the HN's.Can I put the horizontal nipples on the HD bucket or should I just start with a new one?
I use foil bubble wrap, covered with a feed bag (they like to pop bubble wrap too!) for insulation.
I've been contemplating covering the spot over the coop with some heavy duty plastic but that might have to wait until we have a little more budget freedom...and I caught my husband browsing bigger coops on-line!

I just finished an engineering challenge with 3rd graders where they were testing thermal insulators and bubble wrap is one of the materials I provide.