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A 100% efficient nonvented wall heater coats between $200 to $300.
A split costs at least double that.
Coal costs about $1.50 for a gallon of gasoline equivalent, if you buy it by the bag from some where like tractor supply.
Cheaper if you buy bulk.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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