CSE's Mifflintown office (formerly Richard S. Mills, Inc.) specializes in commercial HVAC maintenance and repair with a goal of lowering your building’s operating costs. Our advanced Predictive Maintenance Program will help you experience fewer service calls, lower cost per call, and fewer compressor failures. Enjoy more reliable heating/cooling while saving money at the same time. Serving central PA for over 25 years! Commercial plumbing and refrigeration services also available.