Heating And Air Conditioning Sales, Service And Installation. For over 20 years, Illiana Heating & Air Conditioning Inc. has been helping folks throughout the Lansing & NW Indiana area enjoy total indoor air comfort in their homes and businesses. Our services include but are not limited to: • Custom new construction • Repair of all makes and models • Duct cleaning • Attic insulation • Geothermal heating Our many satisfied customers tell the story, but for your added peace-of-mind, our service fleet utilizes the latest diagnostic technologies to quickly and efficiently determine the nature of your service problem. Our technicians are fully trained and certified by Trane & EPA. Some are also NATE Certified. So whenever you need us, we're here for all your heating and cooling concerns - from scheduled maintenance & repairs to installations with a smile, we're always just a phone call away. Call us today for your free estimate!