We called Aprilaire for recommended Heating & Air Conditioning contractors who serviced their humidifiers. We got three names and called DALCO because they were the highest rated. Travers was on-time, knowledgeable and professional. He found our solenoid valve on the humidifier had failed and replaced it and we are back in business. We will be calling them again when we need our Heating & Air Conditioning serviced in the future.