My family has been installing a/c window units for over 40 years. I chose the over the sill model for looks and ease of installation. I had no idea it would be this easy! The foam mounted support means no more cutting wood to fit gaps or braces. No hunting for insulation to cover the side openings. Everything you need is included. Adjusting the support legs, means no more cutting wood supports to keep the unit in place. This model is not only quiet but does a great job of cooling. This is an excellent product and I would recommend it to everyone needing a window unit.