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Heat pump vs gas furnace in Connecticut: heating cost by fuel (2026)

At Connecticut's average prices, a heat pump (COP 2.5) delivers heat for $32.79 per million BTU, versus $17.77 for a 95% gas furnace, $48.64 for propane and $52.27 for heating oil. That makes the heat pump more expensive than a new gas furnace here. It breaks even with gas at a seasonal COP of 4.61.

Heat pump, est. per year$1,833COP 2.5; $2,291 at COP 2.0, $1,527 at COP 3.0

Gas furnace, est. per year$99395% AFUE; $1,179 at 80%

Propane, est. per year$2,719heat pump breaks even at COP 1.69

Heating oil, est. per year$2,922heat pump breaks even at COP 1.57

Cost per unit of heat in Connecticut, cheapest first

System	$ per MMBtu delivered	Est. per year (55.9 MMBtu)
Gas furnace, 95% AFUE	$17.77	$993
Older gas furnace, 80% AFUE	$21.10	$1,179
Heat pump (seasonal COP 2.5)	$32.79	$1,833
Propane furnace, 95% AFUE	$48.64	$2,719
Heating oil furnace/boiler, 85%	$52.27	$2,922
Electric resistance (baseboard/furnace), 100%	$81.97	$4,581

The Connecticut inputs

Electricity: 27.97¢/kWh, residential average year-to-date through July 2026 (EIA Electric Power Monthly). U.S.: 18.19¢.
Natural gas: $17.49 per thousand cubic feet, average of EIA monthly residential prices for Oct 2025–Mar 2026 (5 months reported). U.S.: $15.60.
Propane: $4.23/gal, week of Oct 19, 2026 (a year earlier: $3.69); EIA state series. EIA weekly prices exclude taxes.
Heating oil: $6.15/gal, week of Oct 19, 2026 (a year earlier: $3.39); EIA state series. Excludes taxes.
Climate: 5,589 heating degree days per year (base 65°F); NOAA CPC population-weighted state average, 2011–2025.

Heating cost calculator

State

Heating degree days / yr

Heat needed per degree day (BTU)

Heat pump seasonal COP

Gas furnace AFUE (%)

Electricity (¢/kWh)

Natural gas ($/Mcf)

Propane ($/gal)

Heating oil ($/gal)

Defaults are the state's latest EIA prices and NOAA degree days; the BTU-per-degree-day, COP and efficiency values are our assumptions. Put in your own bill rates and a known annual heat use for a better answer. Runs in your browser; nothing is sent anywhere. Tip: 1 therm = 0.1 MMBtu; $/therm × 10.36 ≈ $/Mcf.

Assumptions (ours, not EIA/NOAA figures): heat pump seasonal COP 2.5 (we also show 2.0 for very cold climates and 3.0 for mild ones); gas furnace 95% AFUE (older units ~80%); propane furnace 95%; oil 85%; electric resistance 100%. Annual totals assume a home that needs 10,000 BTU of delivered heat per heating degree day, a round number for an existing house; a tight new home may need half that, a drafty one more. The per-MMBtu comparison does not depend on house size. Prices exclude equipment, installation, maintenance, fixed monthly utility charges and rebates. Method & sources.

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