Signature Home Services 6418 Anderson Ave, Hanover, MD21076 Signature Home Services is a full-service heating and air conditioning company based in Hanover and servicing Howard…More County. Services offered include service and installation for air conditioners, thermostats, boilers, heat pumps, duct work, gas conversions, geothermal heat pump systems, preventive maintenance, boilers and indoor air quality. This company is fully licensed and insured and serves commercial and residential clients. Free estimates are available. Visit the Web site at the link provided for a complete list of services and to learn more about the company. Signature Home Services is accredited by the Better Business Bureau.