Heating while no one is home?

[klhandler]

Hello all,
I was wondering what the recommendation was for

heating

while no one is home. My husband and I are away from home an average of 50 hours per week. We live in upstate NY and need to make sure any plumbing we install will not freeze. A wood stove will be great while we are home, but what can we use to safely heat while we are gone? I know juicy maters suggests radiant heat flooring, but we want to build a platform/deck, so we won't be on concrete slab. Any thoughts from people yurt dwelling year round?
Thanks!