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Energy Efficiency Ontario

Local guide

Lowering energy bills in London

A mix of older core neighbourhoods and newer suburbs, with good solar resource for southwestern Ontario.

Last reviewed November 2, 2026
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London at a glance

Electricity distributor
London Hydro
Natural gas
Enbridge Gas
Heating degree days
about 3,900 per year
Winter design temperature
about -19 °C
Solar potential
about 1,180 kWh per kW per year
Electricity prices
Province-wide RPP, effective November 1, 2026

Typical annual heating cost in London

Estimated for a 2,000 sq ft existing detached home. Your costs depend on insulation, airtightness and thermostat settings.

Natural gas furnace (95%)$1,110
Cold-climate heat pump$1,390
Propane (92%)$3,550
Electric baseboard$3,900
Heating oil (80%)$4,590

Assumes gas at $0.45/m³, electricity at $0.16/kWh all-in, oil at $1.6/L, propane at $0.95/L and a seasonal heat pump COP of 2.8. Run it with your own numbers.

Heat pump sizing in London

A typical 2,000 sq ft existing home here needs roughly 36k BTU/h of heat at -19 °C. Ask contractors for capacity at that temperature, not just the nominal tonnage.

Estimate your home's load

Choosing a price plan

London Hydro customers can choose Time-of-Use, Tiered or — where offered — Ultra-Low Overnight at 3.7¢/kWh from 11 p.m. to 7 a.m. Households with an EV or flexible loads often save on ULO.

Compare plans

Where to start

  1. Air seal and insulate the attic
  2. Set thermostat schedules and check your price plan
  3. Replace end-of-life heating with a heat pump or hybrid
  4. Swap remaining bulbs for LEDs
Take the home energy checkup

Common questions in London

Who supplies electricity in London?
London Hydro delivers electricity to most homes in London. Commodity prices are set province-wide by the Ontario Energy Board; delivery charges are set for each utility. You can choose Time-of-Use, Ultra-Low Overnight (where offered) or Tiered pricing by contacting your utility.
Do heat pumps work in London winters?
Yes. London's design temperature is about -19 °C, and cold-climate air-source heat pumps are rated to operate around −25 °C to −30 °C with reduced capacity at the coldest temperatures. Most homes here can be heated by a well-sized heat pump with modest backup heat.
What rebates are available in London?
Homeowners in London can use Ontario's Home Renovation Savings Program for heat pumps, insulation, windows, smart thermostats and more, along with income-qualified programs from Save on Energy and Enbridge Gas. Some municipalities also offer home energy loans — check with the City of London.

Roofs in London can produce about 1,180 kWh per installed kW each year. Estimate it for your roof

Nearby cities