Profile: Johnston Supply, Inc. is a distributor of plumbing, heating, air conditioning and water well supplies. Our products serve the residential and light commercial professional contractor. Our brands are Air ease, Amtrol,Inc., Aqua glass, Aurora/Hydromatic, Bard, Basco, Eemax, Gerber, Liquid Metronics and Takagi. Our products include furnaces, pressure tank stub & showers sump, shower doors, unit heaters, boilers, water softeners, plumbing fixtures, water well pumps and hot water circulator pumps. The two stage gas furnace has a direct vent that increases the thermal efficiency, and two-stage means two furnaces in one. It runs at low capacity during mild weather, saving fuel and then automatically switches over to full capacity to keep warm on colder days.