“Residence” means the place:
(1) where a person has the person's true, fixed, and permanent home and principal establishment; and
(2) to which the person has, whenever absent, the intention of returning.
IC 3-5-5-4 deals with a voter "abandoning" his residence:
A person who has a residence in a precinct retains residency in that precinct until the person abandons the residence by: (1) having the intent to abandon the residence; (2) having the intent to establish a new residence; and (3) acting as provided in this intent by establishing a residence in a new precinct..
Finally, you have IC 3-5-5-5:
As provided in Article 2, Section 4 of the Constitution of the State of Indiana (which deals with elections), a person does not lose residence in a precinct in Indiana by reason of the person's absence on the business of: (1) the state of Indiana; or (2) the United States