​​Why Choose Us?​​

Meet the Owner

Stateline Heating and Cooling, LLC is locally owned and family operated!  Trust your most important investments to only the best!  Our expert technicians are prepared to properly diagnose your system, explain your issue, provide options and arrive at the best solution to meet your heating and cooling needs.  

​Customer Reviews

(908) 777-8822

​​​Keith Muller has been a HVAC technician for more than 33 years.  After spending

the majority of his career working for large HVAC companies, he made the decision

to begin his own venture, making customer satisfaction his primary goal. 


Keith has extensive knowledge and training in oil and gas systems, Geothermal units, heat pumps, air conditioning units, roof top or package units, Leibert systems, ductless mini splits and all associated accessories.  He has expertise in both commercial and residential  systems and carries certifications required for Fujtisu and Dectron Units, is OSHA and EPA certified and licensed as a Master HVAC Technician in the State of New Jersey.