Profile: Johnson's Heating & Air Conditioning supplies air conditioning systems and heating products. We offer gas furnaces and oil furnaces. Our oil-fired boiler is designed to maximize heat transfer from flue gases to the boiler water. Our model 700 automatic humidifier is a computer-equipped, power humidifier that features automatic control. We also offer thermostats, humidifiers, humidifier parts, air cleaners, air cleaner parts and filters.