By doing what it takes to guarantee your complete satisfaction, Jansen's Heating and Air Conditioning's been made welcome in thousands of homes in central Illinois. We started in 1987, and we service all brands and specialize in furnace repair and furnace replacement, as well as heat pumps and geothermal systems. Sure, we've grown and invested in new technologies and training, but we still pride ourselves on never losing sight of the three secrets to business we learned in that first year almost three decades ago: 1. Take care of the customer. 2. Take care of the customer. 3. Take care of the customer.