Professional plus! DHL is a class act company all the way! We had three furnaces and two hot water tanks replaced and air conditioning added to our home. Mark and his team removed all the old and faulty equipment from our mechanical room, cleaned and repainted the floor, mounted plywood to the wall and cleaned up the plumbing pipes, made them look nice and plumb! They had to upgrade our venting system as all our pre-existing equipment was old fashioned. They even helped keep us safe by identifying a potentially dangerous issue with our electrical panel! All of the work was very well done, respect for our house was paramount to them, and they worked with our budget. I would not hesitate to recommend DHL for any plumbing or heating job! Thanks Mark, and to all your crew as well!