Bread-Bakers v097.n004.3

Can anyone suggest a method to keep sourdough starter warm (i.e., 70 -
85 degrees) in a house that remains in the low 60's for the winter?  I
would like to "reactivate" my dried starter, but don't have a place in
the house that reaches the appropriate temperature range.  I don't have
a pilot light in the oven, so I can't place it in there.  And I can't
put in on top of my water heater...it's outside.

Any advice?