Running Costs

What your heating and cooling actually costs to run, and what changes it. Hourly cost calculations, tariff structures, electrical supply limits, energy monitoring, and the savings claims that survive scrutiny versus the ones that do not.

Chart comparing cost per unit of delivered heat for a gas furnace, which is roughly flat, against a heat pump whose cost rises as outdoor temperature falls, with the crossing point marked as the switchover and a second dashed gas line showing the point moves when prices change.

Running Costs

Dual Fuel Switchover Temperature: The Default Is Probably Wrong

Riduan El Hajjouji / September 7, 2026

The switchover temperature is a price fact, not a temperature fact. Here is the one-line calculation that gives you yours, and why the installer default is usually too warm.

AI illustration of a wall-mounted mini-split indoor unit in a living room

Running Costs

Mini-Split Standby Power: Why Nobody Agrees What It Costs

Riduan El Hajjouji / August 30, 2026

Calculate mini-split standby cost from watts or measured kWh, with a worked example, a monthly comparison table and a reusable measurement log.