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Armstrong Pumps – Manufacturer’s overview Armstrong Circulator pumps have been a favourite among Americans looking for quality HVAC equipments. At National Pump Supply, we stock the best pumps that will meet all of your HVAC systems. As temperatures are sliding downhill, circulator pumps are more on demand because they are the heart of any HVAC systems – they circulate hot water in a closed circuit. Thus choosing the best circulator pumps is important because if they fail in th …