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Home Heating Central heating became popular only after the Civil War. Typically, coal-burning furna...

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Natural gas comes partly from Canadian fields.  Bottled gas is more expensive than utility gas.  Equipment for home heating has been considerably improved.  Solar heating dominated America in 2000.  
33 percent.  31 percent.  21 percent.  14 percent.  
used.  burned.  delivered.  pumped.  
33 percent.  31 percent.  21 percent.  14 percent.  
Gas.  Electricity.  Wood.  Oil.  
33 percent.  31 percent.  21 percent.  14 percent.  
used.  burned.  delivered.  pumped.  
1978.  1960.  1997.  2000.  
used.  burned.  delivered.  pumped.  
used  burned  delivered  pumped  
Natural gas comes partly from Canadian fields.  Bottled gas is more expensive than utility gas.  Equipment for home heating has been considerably improved.  Solar heating dominated America in 2000.  
1978.  1960.  1997.  2000.  
1978.  1960.  1997.  2000.  
Gas.  Electricity.  Wood.  Oil.  
Gas.  Electricity.  Wood.  Oil.  
had repaired    have repaired    repaired    are repairing  
Natural gas comes partly from Canadian fields.  Bottled gas is more expensive than utility gas.  Equipment for home heating has been considerably improved.  Solar heating dominated America in 2000.  
Natural gas comes partly from Canadian fields.  Bottled gas is more expensive than utility gas.  Equipment for home heating has been considerably improved.  Solar heating dominated America in 2000.  
Gas.  Electricity.  Wood.  Oil.  

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