The cheapest way to heat a house in 2026 is a heat pump — delivering 3–4 units of heat per unit of electricity at $0.013–$0.018 per 1,000 BTU. For homes without a heat pump, zone heating with a space heater and lowering the central thermostat saves $20–$50/month immediately.
The only fair way to compare heating fuels is cost per 1,000 BTU delivered — not cost per unit of fuel. This accounts for furnace efficiency, heat pump COP, and fuel energy content.
Lower your central thermostat to 62–65°F and use a 1,500W space heater in the room you occupy. You heat 200 sq ft instead of 1,500+ sq ft. At $0.23/hour for the space heater vs. $0.80–$1.50/hour for whole-home gas heating, zone heating saves $20–$50/month for most households. Oil-filled radiators with ECO mode are the most efficient for sustained zone heating.
Adding attic insulation from R-11 to R-38 reduces heating costs by 15–25% permanently. At $1,500–$3,000 for a 1,500 sq ft attic, the payback period is 3–5 years at average heating costs. Air sealing around windows and doors adds another 10–15% reduction for $200–$500 in DIY materials. The cheapest heating is heat you do not lose.
A programmable thermostat that drops temperature 7–10°F for 8 hours (at work and asleep) saves about 10% per year on heating costs — roughly $15–$40/month for the average US home. Smart thermostats like the Ecobee additionally use occupancy sensors to prevent heating empty rooms. Payback period is 3–6 months.
Replacing electric resistance heating with a heat pump saves $1,000–$1,500/year. Replacing a gas furnace saves $300–$600/year in most states. The 2026 federal tax credit covers 30% of installation costs up to $2,000 (Inflation Reduction Act). At a $6,000–$10,000 installation cost, payback is 5–8 years on gas savings and 3–5 years on electric resistance savings.
Single-pane windows lose 10–30% of heating energy. Applying window insulation film ($20–$40 per window) reduces heat loss by 35–45%. Foam weatherstripping around doors ($5–$15/door) eliminates drafts that account for up to 20% of heating loss in older homes. Total investment of $100–$200 can reduce heating bills by $30–$60/month.