an electric furnace runs off of 208/230 Volts while a typical
gas furnace runs off of 120 also a gas furnace will have a valve
for the gas relay where the gas enters the furnace.
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how big of a gas furnace do I need for a 2 story 2300 square
foot house in northwest ohio
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You can find a schematic for a gas furnace on the website,
Uncionradio.
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You should not run gas from the furnace to any appliances.