In a home of under 1,200 square feet thats single-floor, like yours, or that has an open floor plan, it may be worth looking into installing one or two wall-mounted gas heaters. The payback for this option would likely be on the low end of the ranges I mentioned. I suggest that you contact a heating and ventilation contractor to help you determine the best option for your space. Also, give Efficiency Vermont a call to find out if you qualify to receive financial incentives toward the cost of switching to a gas system. These incentives are provided to certain very high-usage households. All the best in your new home.