One of South Suburban Chicagoland's Premier Refrigeration, Heating and Air Conditioning Service, Sales and Installation Companies. Family owned and operated for nearly 40 years! We Participate in The ComEd Central Air Conditioner Efficiency Program. Learn how Sub Zero Refrigeration and ComEd can help you improve the efficiency of your home's central air conditioning system and save you money on your electricity bill. With and A+ rating we are a proud member of the Better Business Bureau and have been accredited since 1985. We are also proud members of the Air Conditioning Contractors Association of America. We have six skilled technicians able to meet your comfort needs every season of the year.