I can't test this refactored version of your script because, as toolic pointed out earlier, it's not a complete computer program.

use strict;
use warnings;
use autodie qw( open close );
use English qw( -no_match_vars );

my %households;
my $household;
my $first_name;
my $last_name;
my $voter_rating;
my $support_level;
my $phone_number;

format Household =

@<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
$household
==================================
.

format Voter =
@<<<<<<<<<<<<<<< @<<<<<<<<<<<<<<< @<< @<<<<<<<<<<<<
     $last_name, $first_name, $voter_rating, $phone_number
.

open my $fh, '>encoding(ISO-8859-1)', 'out.txt';

select $fh;

for $household (sort keys %households) {
    local $FORMAT_NAME = 'Household';

    write;

    for my $member (@{ $households{$household} }) {
        $first_name    = $member->{first_name};
        $last_name     = $member->{last_name};
        $voter_rating  = $member->{voter_rating};
        $support_level = $member->{support_level};
        $phone_number  = $member->{mobile_number} // $member->{phone_n
+umber} // '';

        local $FORMAT_NAME = 'Voter';

        write;
    }
}

close $fh;

exit 0;
[download]

Jim