NORTHLAND HEATING & AIR CONDITIONING do engineering. Heat loss calculation regarding residential and commercial buildings plus heating & cooling services. We do different kind of Air-conditioners like central A/Cs or ductless A/Cs, furnaces, fireplaces, unit heater, rooftops, convert electric and oil to gas furnaces. We also do humidifiers, air-filters and duct working for commercial & residential buildings. more... See more text