I used Alpha Environmental Solutions to bring the existing R-10 attic insulation in my 100 year old house up to R50 by blowing in R-40 cellulose insulation. From my initial phone call to enquire about cost to having the work completed, Eric was informative and a pleasure to deal with. Even though it was a fairly small job (approximately 200 square feet), they were punctual, friendly and professional. They took great care to cover the carpeting on the stairs before running the hose to the second floor and cleaned up when they were done. I'm happy to share my positive experience.