Service Agreements Your Comfort is Our Business Service Agreements Call Callahan Heating & Air Conditioning for Dependable Service! We have the expertise to install and service... all major brands of Heating & for complete installations Plumbers to handle both our boiler and hot water heater installs Plumbing Service Department for gas line hookups, pump installs, leaks and repairs... for complete installations Plumbers to handle both our boiler and hot water heater installs Plumbing Service Department for gas line hookups, pump installs, leaks and repairs...

Residential HVAC Your Comfort is Our Business Residential HVAC Callahan Air Conditioning & Heating is a full service residential Heating, Ventilation, & Air Conditioning... contractor, serving homeowners throughout the Merrimack Valley and Southern New Hampshire.. We offer complete services for both replacement heating and air conditioning systems and new... construction, or system expansion in your new addition. We also perform heating and air conditioning system conversions to achieve high-energy efficiency. 24-hour emergency service...

, and refrigeration servces to area businesses, commercial real estate properties, and institutions. Since 1986 we have provided customized design, installation, planned maintenance and service... complete, expert services for both replacement heating and air conditioning systems and new construction, or system expansion in your new addition. We also perform heating and air... warm all winter, cool all summer, and safe all year long 24-hour emergency service In-house system design and fabrication Indoor air quality improvements Climate control & energy...

Government Contracts Your Comfort is Our Business Government Contracts Callahan Air Conditioning & Heating is a full service Mechanical Contractor for both residential...-key. We offer complete services for Heating and Air Conditioning Systems including replacements of your current systems, conversions to high efficiency, new construction including... and repairs. We have a full service department to cover emergencies for all departments 24 hours 7 days a week. With more than 85 years of combined experience they will get you up...

& cooling equipment and install information from the builder to your name for warranty and service. ...