Different homepage for logged in users

What is the is_loggedin() function ? Is that something you have create by yourself ?

WordPress already got what you need, : is_user_logged_in()

You can use is_home() & is_user_logged_in() to be sure that the content will not display on other page.

As @Ivan Shatsky say’s, don’t use “else condition” like that.

    //Home.php file
    if (is_home() && is_user_logged_in()) {
        get_header('login');
        //My content
        get_sidebar('login');
        get_footer('login');
    } else {
        get_header();
       //My content
       get_sidebar();
       get_footer();
    }

Not tested !