If you do run another service line from your cistern into the house, run your service line inside a larger line along with heat tape. Cover it with a good layer of snow. The heat tape will keep the line open as well as the air around the service line above the freezing point and you should be OK. A 3" solid drain tile would be about right, not the perforated kind. Don't want any melting snow water to get inside.
Edited by chieffan, February 21, 2015 - 09:06 PM.