You’re standing in the appliance aisle, comparing a 4.5‑star French door to a 3‑star top mount and thinking, “More stars must mean cheaper to run… right?” Not always. A bigger, higher‑star fridge can still use more power than a smaller, lower‑star one. And recent label updates mean an old 4‑star sticker isn’t apples‑to‑apples with a new 4‑star.

Appliance aisle showing multiple refrigerators with Energy Rating Labels on the doors
Energy Rating Labels can mislead if you compare stars without the kWh figure.

Here’s the bit most people miss: the Energy Rating Label shows two things that matter in different ways. The stars tell you how efficient that model is compared with similar‑sized fridges. The bold number lists its tested annual energy consumption in kWh. Your running cost is simply kWh × your tariff (what you pay per kWh on your bill).

I’ve spent over two decades around appliance design, testing and standards from Auckland to Adelaide. The shoppers who end up happiest use the kWh number to price their choice, then let stars break ties within a size. The ones who don’t? They often overbuy capacity or run a “spare” fridge in the garage that quietly chews through $200 a year.

What should you really compare?

Think of fridge shopping like choosing a car for a specific trip. You don’t pick by fuel‑efficiency alone; you also pick the right size for the passengers and roads. It’s the same here.

The old logic says: “More stars = cheaper to run.” The smarter logic says: “Size first, then stars, then features-priced off kWh.” Why? Because star ratings are relative within size bands, and standards changed. In Australia and New Zealand, fridges are labelled under AS/NZS 4474:2018 with testing per AS/NZS IEC 62552:2018. Current labels can show up to 10 stars. If you’re comparing a 630 L French door with a 420 L top mount, the stars aren’t directly comparable. Use the kWh.

Start asking:

  • What’s the smallest usable capacity I can live with comfortably?
  • What is the label’s annual kWh, and what does that cost at my tariff?
  • Does this layout or feature (through‑door ice, extra doors) add meaningful kWh for me?

What do the numbers actually say?

Here are the facts that change decisions:

  • The label: It shows star rating and tested kWh per year. Multiply kWh by your tariff (c/kWh) to estimate annual cost. The NZ and AU programs make the same point-your bill gives the price per kWh.
  • Test conditions: The energy number is calculated under standard conditions (NZ’s method assumes 22°C ambient and includes allowances for door openings and cooling newly added food). Hotter kitchens push real‑world usage higher.
  • Typical consumption by size from AU registration data:
    • 300-400 L: around 326 kWh/yr
    • 400-500 L: around 368 kWh/yr
    • 500-600 L: around 444 kWh/yr
    • 600-700 L: around 496 kWh/yr
  • Running cost depends on your tariff. Current single‑rate examples: AU roughly 24-44 c/kWh; NZ averages about 35.7 c/kWh nationally.
  • Configuration matters. Top‑mount fridges tend to sip less than side‑by‑sides and French doors. Through‑door ice/water adds consumption. Chest freezers are usually more efficient than uprights.
  • Within a similar size, more stars do save money. One mid‑size AU example: about 310 kWh/yr at 4 stars versus 559 kWh/yr at 1 star-roughly AU$82/yr saved at 33 c/kWh. In NZ, a 4.5‑star around 291 kWh vs a 3‑star around 404 kWh saves about NZ$40/yr at 35.7 c/kWh.
  • Each extra star on the current NZ label generally reflects roughly an 18% drop in energy within the same size/type. But star bands changed with the new label, so don’t compare old and new stars-compare kWh.

What happens when you get it wrong?

A mate in Christchurch loved his “free” hand‑me‑down garage fridge for beer and holiday overflow. It was old but “still going strong.” His power bills jumped each summer. When we checked, that second unit was likely burning NZ$150-$250 a year-more than the Christmas seafood it kept cool. He now runs it only in December and turns it off the rest of the year. Savings: real, and noticeable.

Picture two households in Brisbane:

  • Household A buys a 680 L French door for a family of three “just in case.” It looks great but uses about 496 kWh/yr. In a hot kitchen, doors opening all arvo, the real‑world number climbs. The water/ice feature hums along, even when they’re away.
  • Household B chooses a 420 L top mount with high stars. It uses roughly 368 kWh/yr on paper. They leave 10 cm up top, 5 cm to the sides, set 3-4°C in the fridge and −18°C in the freezer, and keep seals clean.

Six months in, A is frustrated with higher bills and crowded doors that spill cold air; B barely thinks about the fridge except when the quarterly bill lands a little lower than expected. The difference isn’t just money; it’s the feeling you made a good call for your home.

How do you choose the smart way?

The CHILL framework

  • C Capacity: Right‑size first. As a rough guide, AU government advice suggests 250-380 L for 1-2 people; 350-530 L for 3-4; 440 L+ for bigger households. Oversizing is an annual tax.
  • H Heat/placement: Fridges hate heat and tight cavities. Keep them out of sun and away from ovens; allow ventilation (about 5 cm sides and 10 cm top/back is common). Hot garages or sheds = higher kWh and potential performance issues.
  • I Intake/features: Through‑door ice/water, extra drawers and fancy lighting all add watts. Only pay for what you’ll use weekly.
  • L Label (kWh): Compare the annual kWh across models, then multiply by your tariff to price the choice.
  • L Lifestyle/use: Set temperatures to 3-4°C (fridge) and −15 to −18°C (freezer). Every degree colder can add around 5% to energy. Heavy door‑opening households should prioritise layouts that minimise cold‑air spill (solid freezer drawers help).
Close-up of an Energy Rating Label showing star rating and annual kWh
Always check the kWh figure on the label, not just the stars.

Questions to bring to the store or product page:

  • What’s the labelled kWh and my annual cost at my tariff?
  • How many usable litres in the fridge vs freezer?
  • What ventilation clearance does this model need?
  • What refrigerant does it use (many modern units use lower‑GWP R600a)?
  • Any design caveats for garages or very cold rooms?

What’s the step‑by‑step to buy right in AU/NZ?

  1. Nail the size. Measure your cavity, including door swing and ventilation space. Pick the smallest capacity that fits your household for the next 8-10 years. If you sometimes need extra space, a cooler bag for parties beats owning a second fridge year‑round.
  2. Price your power. Grab your latest bill for your c/kWh. On each product card, find the Energy Rating Label’s kWh figure (it’s printed near the stars). Annual cost = kWh × your tariff. Example:
    • AU: A 400-500 L fridge at 368 kWh/yr costs about AU$88-$162/yr at 24-44 c/kWh.
    • NZ: The same kWh at 35.7 c/kWh is roughly NZ$132/yr.
  3. Use stars to break ties within size. Within a similar capacity and type, more stars generally mean less energy. On the current NZ label, each extra star signals roughly an 18% efficiency gain. But don’t compare old stars to new stars; use kWh for cross‑era comparisons.
  4. Choose configuration with your habits in mind.
    • Efficiency lean: top mount.
    • Convenience lean: French door or side‑by‑side, but expect higher kWh-especially with through‑door ice/water.
    • Freezer only: chest freezers beat uprights; if upright, solid drawers reduce cold‑air spill.
  5. Factor climate and location. Standardised labels don’t adjust for Cairns summers or Central Otago winters. In hot spots, ventilation becomes critical and real‑world kWh rises. In very cold garages, some single‑thermostat fridge‑freezers may not run the compressor enough, risking soft ice‑cream or thawing.
  6. Model your payback. AU mid‑size example: 4‑star ≈ 310 kWh vs 1‑star ≈ 559 kWh saves about 249 kWh/yr. At 33 c/kWh, that’s ≈ AU$82/yr, ≈ AU$820 over 10 years. If the higher‑star model costs ≤ AU$800 more, it should pay for itself on energy alone. NZ mid‑size example: 4.5‑star ≈ 291 kWh vs 3‑star ≈ 404 kWh saves ≈ 113 kWh/yr. At 35.7 c/kWh, ≈ NZ$40/yr; ≈ NZ$400 over 10 years.
  7. Avoid the “garage fridge” trap. Older second units regularly cost NZ$100-$300 per year to run. If you must keep one, plug it in only when needed and never park it in a hot, uninsulated space.
  8. Set up for low bills from day one.
    • Level and ventilate the cabinet; clean coils and seals yearly.
    • Set 3-4°C fridge, −15 to −18°C freezer. Each degree colder adds ~5%.
    • Load sensibly; let hot leftovers cool before shelving.
    • Use the Energy Rating Calculator (AU/NZ E3 program) to compare registered models by running cost.

Common head‑scratchers, cleared up:

  • Old vs new labels: Standards and star scaling changed (AS/NZS 4474:2018 + AS/NZS IEC 62552:2018). Don’t compare old stars to new stars-compare kWh.
  • Bigger with more stars vs smaller with fewer stars: The bigger one can still use more energy overall. Always check the kWh.
  • “It’s cold in the garage, so it must use less”: Temperature swings mess with controls and can raise usage or risk food safety. Keep fridges in stable‑temperature spots.

The bottom line: Buy for the energy bill you’ll live with, not just the stars you’ll brag about. Start with the right size, price your choice using kWh × your tariff, then chase stars within that size. Place it well, set it right, and avoid the zombie second fridge. Do that, and you’ll lock in low running costs for the next decade without sacrificing how your kitchen works day to day.