Armstrong User Manuals Download - ManualsLib . View & download of more than 274 Armstrong PDF user manuals, service manuals, operating guides. Water pump user manuals, operating guides & specifications. Armstrong Air Residential Heating & Cooling Home HVAC . Since 1928, Armstrong Air has been the smart choice for homeowners who expect more from their heating and cooling system. Built with durable materials and incorporating brilliant technology throughout, Armstrong Air is not only the brand to trust with your home comfort, it's also the brand more dealers would choose for themselves.