We are first-time homeowners and our master bedroom has been very cold in the winter. After climbing into the attic it was clear we needed more insulation, particularly in the hard-to-access area above the master (seems like it never had good insulation coverage, no idea how previous homeowners coped). David and his crew were prompt, very communicative, professional, did a great job exactly when they said they would, and the price was competitive. They fully covered the entire attic with R60 and sealed up vents leftover from the swamp cooler no longer in use. The difference is HUGE. Not only is the master bedroom ~5 degrees warmer, but the sealing they did up there reduced airflow into the house by 25%. Their blow test also indicated areas I could seal in the basement, around windows, and around the fireplace, which I did with some calking and expanding foam. That got another 10% reduction in airflow, for a whopping 35% total reduction. There's no question we're saving on our heating/cooling. Money very well spent.