Chapter 08Home & Car

How do I lower my energy bill?

Heating and cooling are usually over half the bill. Dropping the thermostat one degree, sealing draughts around doors and windows, and washing clothes cold typically save more than replacing any single appliance.

Follow-up questions

What uses the most electricity in a home?

Heating and cooling, then water heating, then the fridge, tumble dryer, and oven. Standby devices are real but small by comparison.

Is it cheaper to leave heating on low all day?

No, for most homes. Heating only when needed uses less energy overall, because heat loss is proportional to indoor-outdoor temperature difference.

Do smart thermostats save money?

Typically 8–15% of heating cost, mostly by not heating an empty house. The saving is largest in homes with irregular schedules.

Does closing doors to unused rooms help?

Yes with radiators and zoned systems, but it can raise pressure and reduce efficiency in some forced-air systems.

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