Washing at low temperatures: how to save electricity and protect your clothes

You know that feeling when the electricity bill arrives and you start blaming the weather? Few people realise it, but washing and drying account for a large share of household electricity use. The good news — you can cut a big chunk of that bill with one simple change: washing in cooler water. The only questions are whether it really works, and how to make sure your clothes still come out clean.

Why 60 °C has traditionally been seen as "the norm"

Traditional detergents (20th-century powder formulas) were designed to work in hot water. The logic is simple — hot water:

• Dissolves grease
• Activates surfactants
• Kills some bacteria

But hot water comes at a cost. Most of the electricity used during a wash (roughly 75–90 %) goes on heating the water. The machine itself and its motor account for only a small share of the rest.

What's changed: the enzyme laundry detergent revolution

Modern enzyme laundry detergents are designed to work specifically at low temperatures. Why?

• Enzymes (proteases, lipases, amylases) are biological catalysts that target and break down organic soiling
• Their optimal activity range is 20–40 °C
• At higher temperatures (above 60 °C), enzymes are deactivated (denatured)

In other words, enzyme laundry detergent at 30 °C often performs better than traditional detergent at 60 °C. To learn more about how enzymes work, read our main article on enzyme laundry detergent.

How much you really save

A typical family household in Lithuania does 4–6 washes a week. Roughly speaking, a single wash uses:

• 60 °C: 1.2–2.0 kWh
• 40 °C: 0.7–1.0 kWh
• 30 °C: 0.4–0.6 kWh

(Exact figures depend on your washing machine model, load and programme.)

The difference between 60 °C and 30 °C is roughly 0.8–1.4 kWh per wash. In Lithuania, the average household consumer pays around €0.16–0.22 per kWh (depending on plan and tariff). That means a saving of roughly €0.15–0.25 on every wash.

For a family washing five times a week, that's €40–60 a year, and over 5 years — more than €200. Plus:

• Less friction during washing — clothes last longer (less gets thrown away)
• Less detergent residue on fibres
• Lower risk of damaging delicate fabrics
• A smaller CO₂ footprint

When low temperatures work PERFECTLY

• Everyday clothes (cotton, synthetics): 30–40 °C
• Coloured clothes (to keep them bright): 30 °C
• Lightly soiled workwear: 40 °C
• Sportswear (moisture-wicking): 30 °C
• Underwear (for healthy people): 30 °C
• Everyday bedding: 30–40 °C

When you STILL need a higher temperature

There are cases where 30 °C really is too cold:

• Bed linen in households where someone is ill (60–90 °C because of bacteria)
• Kitchen cloths and towels (60 °C for hygiene reasons)
• Cot bedding and cloth nappies (60 °C)
• Heavily sweat-stained or soiled workwear
• For people with a severe dust mite allergy — 60 °C is sometimes recommended for bed linen

Even in these cases, it's better to separate such items from everyday laundry than to raise the temperature of the whole wash.

Practical tips for successful cold washing

At low temperatures, the detergent needs to be chosen and used correctly:

1. Choose a genuine enzyme laundry detergent — this is the key to success. For example, Ecozyme enzyme laundry detergent is designed to work from 20 °C.
2. For set-in stains — pre-treat for 15–30 minutes by applying detergent directly to the stain.
3. Dose correctly — don't overdo it. Too much detergent means poorer rinsing, not better cleaning. The standard 30 ml dose is plenty for everyday washing.
4. Don't overload the drum — when clothes can move freely, the detergent reaches every fibre.
5. Choose the right programme — "Eco" or "Cotton 30/40" is often best for everyday washing.
6. Dry thoroughly — cooler washing calls for good drying. Air-dry in a well-ventilated room or use a tumble dryer.

What about the smell?

For some people, washing at low temperatures leaves a nagging doubt — is it really clean? Two things help here:

• The fragrance of enzyme laundry detergent lingers on fabrics (in Ecozyme's case — notes of red apple, peony and rose)
• Fabric softener — for both a longer-lasting fragrance and an anti-static effect

For those who use both products regularly, the Ecozyme laundry detergent + fabric softener set is the best-value option — you'll save on both the price and the delivery charge.

Frequently asked questions

Does washing at 30 °C kill bacteria?

Not all of them. But with an enzyme laundry detergent, it's enough for most everyday clothes. Bacteria are only a real concern in specific cases — during illness, for baby bedding and for bed linen used by allergy sufferers.

Does my old washing machine really wash at 30 °C when set to 30 °C?

Older washing machines sometimes "measure" temperature inaccurately. If you're unsure about the exact result, test it with a thermometer.

Is the ECO programme the same as 30 °C?

Not always. ECO often takes longer (making up for the lower temperature with time), but the water itself is usually only heated to 30–40 °C. Check your washing machine's manual.

Does a tumble dryer cancel out the savings?

Yes, but not as much as hot washing does. Air-drying is best. In winter, you can dry clothes near a radiator (the heat is released into the air anyway — this way it does double duty).

Is a high temperature better for heavily sweat-stained clothes?

No. Sweat is a protein, and heat coagulates protein and sets it into the fabric. Warm (40 °C) but not hot water plus an enzyme laundry detergent is the best strategy for sweat stains.

Summary

Washing at low temperatures is neither a fad nor eco-marketing. It's a mathematically sound practice that saves electricity and clothes, and can even improve your washing results if you use the right detergent. The key is simple: enzyme laundry detergent + 30–40 °C + correct dosing = uncompromising cleanliness. Try it for one month to start with — you won't want to go back to washing at 60 °C.