This substantial cost difference may lead homeowners to consider converting from propane to natural gas once natural gas becomes available in their neighborhood. The conversion process can be complicated, and the cost can range from under $1,000 to more than $5,000.Click to see full answer. Then, can you convert a house from propane to natural gas?Most propane furnaces, fireplaces and some stoves can be converted to natural gas by simply changing the orifice. Hot water tanks vary in their conversion capabilities. In order to convert your heating and appliances, please consult with a licensed heating contractor or plumber.Likewise, how much more expensive is propane than natural gas? At $2.50 per gallon of propane, natural gas would be a more cost effective energy solution. Breaking it down even further, natural gas needs to be more than $28.00 per 1,000 cubic feet for propane to be a more cost effective energy solution (provided the cost for propane is $2.50 per gallon. Thereof, how much does it cost to convert a propane furnace to natural gas? Natural Gas & Propane Furnace Costs Mid-range efficiency (80% AFUE) $900-$1,800 High efficiency (94% AFUE) $2,000-$3,000 Wall $1,200-$1,700 Unit $1,000-$4,800 Propane conversion kit $150-$300 How much does it cost to switch to natural gas?According to CBS Boston, switching to a natural gas forced hot air system can cost between $4,500 and $7,000. And according to New England Cable News, conversions will run a household $3,500-$10,000. So you can see a wide swing between $3,500 and $10,000. New gas line installation can cost about $1,000.