How low can we go?

I used to keep the house at 69 degrees. I was freezing. So, I bought some silky long underwear, new thick socks, and indoor crocs. I was finally warm. I looked around and saw my kids in various stages of undress all day long. What??? It's winter. BUNDLE UP!! Every day I am dropping the temp a degree until the kids are dressed like MN kids and complaining or until I can't stand it. We are at 66 degrees today. Looks like we'll be hitting 65 tomorrow. As long as I have my long underwear, it is all good.