Unexpected results with conditionals inside template part

Scenario: I have a template part loop-product.php which i am calling from home.php, taxonomy.php and a page template template-products.php. Inside that template part loop-product.php file i am setting the number of columns by checking is_home() conditionals.

Problem:
The conditional works fine for homepage, taxonomy page but its still set on the page template. On the product item i have added a class columns-$cols so you can check it on the site. Its showing columns-4 on the product template page where it suppose to show columns-3.

<?php
    $j = 1;
    if(is_home()){
        $cols = 4;
    }else{
        $cols = 3;
    }
    if(have_posts()):while(have_posts()):the_post();

        // getting thumbnail image here 
    ?>

            <div class="product-item <?php echo 'columns-'.$cols ?>" <?php if($j%$cols == 0){ echo 'style="margin-right:0;"'; } ?>>
              <a href="<?php the_permalink(); ?>">
                <span class="product-img">
                    <img src="<?php echo $img[0]; ?>" width="100" height="75" alt="<?php the_title(); ?>">
                </span>
                <span class="desc">
                    <h2><?php the_title(); ?></h2>
                <?php
                    if($price): ?>
                    <span class="price">Price: <?php echo $price; ?> BDT</span>
                <?php endif; ?>                    

                     </span>
                </a>
             </div>
             <?php if($j%$cols == 0){ echo '<div class="clear"></div>'; } ?>

             <?php $j++; endwhile; endif; ?>

                <div class="clear"></div>

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Page template code: http://pastebin.com/CzRgzzVF