DHL is a great company. Their staff are very friendly and personable. The staff were willing and able to answer any question I had about the install and the product. They came on time and finished in a timely manner. The area they worked in was left perfectly clean. They replaced our hot water heater, humidifier, furnace and later we had them come back and install AC for us. All units are working great and without flaws. I highly recommend DHL Mechanical to friends and family. They know their stuff and I won't go with anyone else!!