RSP Heating & Cooling strives to bring the best possible heating & cooling repair services to Southern Illinois. As the largest Trane Comfort Specialist dealer in Southern Illinois, we take pride in offering high quality products that will last a lifetime. We also are open 24/7. Offering 24-hour HVAC repair to everyone in the Marion Illinois area. Do you need spray foam insulation? Our highly trained HVAC technicians can help you lower your energy bills and keeping your home warm. We employ a fantastic staff of NATE Certified Technicians, client care representatives, and comfort consultants with years of experience and education in the heating and cooling industry.