We had several cold draughts in the house, from both windows and exterior doors, and Melvin did a great job caulking and weatherstripping everything. He was very responsive, showed up on time, made a thorough evaluation of everything that needed to be done and then returned to take care of the issues. He also came back when we noticed the weatherstripping for one of the doors had not expanded as much as expected and he brought a thicker strip and re-did it. He did not over-quote or over-sell (another contractor had suggested replacing our doors altogether), and was very pleasant to deal with. He also explained the kind of more extensive work we would have to do to completely fix the problem in poorly insulated kitchen exterior walls, but left that up to us.