Cheapest way to heat in Connecticut
Natural gas
$18.74 per million Btu of heat in the house, about $1,096 for a typical winter. The most expensive option, electric resistance, would cost $4,708.
Typical winter: a 2,000 sq ft house of average insulation in a normal Connecticut heating season. Prices as of October 26, 2026.
Cost of one million Btu of heat
Your home, your winter
Change the size and insulation to match your house. Prices are this week’s Connecticut figures.
Normal heating season in Connecticut: 5,848 heating degree days, so about 58 million Btu of heat to deliver.
- Natural gas $1,096
- Heat pump $1,883
- Heating oil $3,055
- Propane $3,246
- Electric resistance $4,708
A typical-weather season at this week’s fuel prices. Efficiencies: gas furnace 90%, propane and oil 85%, heat pump seasonal COP 2.5. How the estimate works
Connecticut’s winters
A normal heating season here has 5,848 heating degree days (1991–2020 average; U.S. lower 48: about 4,300).
Last season (2025–26) had 6,004, +2.7% against normal.
- Oct381
- Nov674
- Dec976
- Jan1,144
- Feb977
- Mar853
- Apr506
In the coldest season of the last 30 (2002–03) the same house would have needed 13% more heat; in the mildest (2011–12), 18% less.
What this comparison leaves out
- Equipment you already have. Switching fuels means new equipment. This page compares the cost of heat, not the cost of a new furnace, boiler or heat pump.
- Availability. Natural gas needs a utility main on your street.
- Heat pumps in deep cold. A heat pump’s efficiency falls as it gets colder. The seasonal COP of 2.5 used here suits a modern unit in a moderate climate; older units, or cold-climate homes with resistance backup, do worse.
- Your rate structure. Gas and electricity prices here are state averages including fixed charges. Each extra unit on your bill may cost a little less.
