How to Save Energy at Home: Compare Appliance Running Costs and Cut Your Bills

Updated

To save energy at home, start by measuring what your appliances actually cost to run, then target the biggest loads first: heating and cooling, refrigeration, laundry, lighting, and standby power. Sust-it (sust-it.net) provides energy efficiency databases for household electricals and vehicles, plus running-cost and electricity-cost calculators, so you can estimate costs per hour, cycle, or year before you buy or change habits. This guide is for anyone who wants a practical, evidence-based way to cut electricity bills and CO2 without guessing.

Step 1: Find out what is costing you the most

The fastest savings come from the appliances that run longest or heat/cool the most. Use this order of attack:

  1. Heating and cooling — electric heaters, immersion heaters, and kettles are high-power devices; even short use adds up.
  2. Refrigeration — runs 24/7, so a small efficiency difference compounds over the year.
  3. Washing, drying, and dishwashing — cycle costs depend on power rating and cycle length.
  4. Lighting — Sust-it notes lighting accounts for 10–20% of a typical home's electricity bill.
  5. Standby and small appliances — TVs, entertainment, computers, and chargers draw power even when idle.

Use power ratings and running-cost calculators

A power rating (in watts) tells you the maximum draw; running cost = power (kW) × hours used × your electricity price. Sust-it's electricity cost calculators and appliance databases let you plug in a product and see estimated running costs and energy usage, so you can compare "what it costs per hour/cycle/year" rather than relying on a label alone.

Example task: Before buying a new heater, look up the model's power rating, estimate hours of use per week, and calculate the weekly cost. Compare two models on the same basis — the lower-wattage model only saves money if it actually heats the room adequately.

Step 2: Compare products on the same dimensions

When choosing between products, compare like with like:

Dimension What to check Why it matters
Power rating (W) Max draw at typical setting Directly drives running cost
Energy usage per cycle/year Database estimate Captures real-world use, not just peak power
Running cost Calculated at your electricity price Makes trade-offs visible
CO2 emissions Product or vehicle emissions data Relevant if carbon reduction is a goal

Sust-it's databases cover appliances and refrigeration, washing and drying, dishwashers, cookers, small appliances, TVs and entertainment, computers and monitors, projectors, printers, and low-energy lighting. For motoring, it covers electric, petrol, and diesel vehicles with emissions data, fuel consumption, and running costs, plus electric car journey calculators.

Lighting: a low-cost, high-return swap

Switching to low-energy and LED bulbs is one of the simplest savings. Use the LED bulb comparison pages to check power ratings and running costs before buying, and read the low-energy lighting guide to see how much of your bill lighting represents.

Step 3: Apply low-cost habits and home improvements

  • Heat only what you need: use thermostats and timers; avoid heating empty rooms.
  • Run full loads: washing machines, dryers, and dishwashers are most efficient when full.
  • Cut standby: switch off at the plug where practical.
  • Use the energy-proof-your-home tool: enter your postcode on Sust-it to get energy efficiency recommendations aimed at reducing bills, boosting home value, and cutting carbon emissions.
  • Consider green finance: Sust-it's blog covers green mortgages and property-linked energy efficiency finance — check eligibility and terms before committing.

Step 4: Include motoring if it is part of your goal

If transport is a major cost, use the vehicle running-cost databases and electric car journey calculators to compare emissions, fuel consumption, and running costs between electric, petrol, and diesel options. Treat manufacturer and database figures as estimates; your actual costs depend on driving style, routes, and energy prices.

Common mistakes to avoid

  • Relying on labels alone — an A-rated appliance can still cost more if it is larger or used more.
  • Ignoring standby and heating — these are often the hidden loads.
  • Comparing peak power only — use energy usage per cycle/year where available.
  • Assuming a lower-wattage device always saves money — check whether it delivers the same result (e.g., heating performance).
  • Skipping the postcode step — home recommendations depend on your location and property.

Where to start today

  1. List your five most-used appliances.
  2. Look up each in Sust-it's databases and note power rating and estimated running cost.
  3. Calculate weekly/monthly cost at your electricity price.
  4. Target the top two for replacement or habit change.
  5. Enter your postcode for home-specific recommendations.

Sust-it also offers a free quarterly newsletter on energy-efficient electricals; subscribing is optional and separate from using the databases and calculators.