We've used data based on the Energy Information Administration (EIA), which publishes price data weekly on home heating oil in 38 states by dollar-per-gallon before taxes. Unlike natural gas and electricity, home heating oil is provided by independent retailers.

The latest price of home heating oil nationwide is $2.80, up six cents from last week and up thirteen cents since the beginning of the season.

EIA's heating oil data is seasonal - from October through March. Here's a look at the series since its inception in 1990.