Search Results page is outputting h1 tags for each listing

twenty eleven

I’ve never used that before; can you tell me how I would change it so that it only affects the search results and not all of the pages?

Here is the template information; can you tell me what exactly I need to edit to make the title of each search result display in an h2 tag?

<header class="page-header">
					<h1 class="page-title"><?php printf( __( 'Search Results for: %s', 'twentyeleven' ), '<span>' . get_search_query() . '</span>' ); ?></h1>
				</header>

				<?php twentyeleven_content_nav( 'nav-above' ); ?>

				<?php /* Start the Loop */ ?>
				<?php while ( have_posts() ) : the_post(); ?>

					<?php
						/* Include the Post-Format-specific template for the content.
						 * If you want to overload this in a child theme then include a file
						 * called content-___.php (where ___ is the Post Format name) and that will be used instead.
						 */
						get_template_part( 'content', get_post_format() );
					?>

				<?php endwhile; ?>

this is the search.php page.