Most Wrentham homeowners save 30-75% on their annual heating costs after converting from oil to natural gas. With heating oil averaging $3.80 per gallon in Massachusetts, a typical home using 800 gallons per year spends about $3,040 annually on oil.After conversion, that same home might spend $900-1,500 per year on natural gas, depending on usage and current rates. That’s $1,500-2,100 in annual savings. With conversion costs typically ranging from $3,500-8,000, most homeowners see full payback within 2-4 years.The savings continue for the life of your system – often 15-20 years or more. Over that time, you could save $25,000-40,000 compared to staying with oil heat.