The care label sets the limit, and the type of soil determines whether you need to approach that limit. More heat can increase fading, shrinkage, and fiber damage.
Cold water works for many everyday loads
Dark colors, lightly soiled clothing, and sensitive fabrics often benefit from cooler washing. Modern detergents are designed to work in cold water for many routine loads.
Warm water can help with some body oils and heavier soil
Towels, bedding, and moderately dirty washable items may tolerate warmer water when their labels permit it.
Use hot water only when fabric and purpose justify it
Some sturdy whites and specific hygiene situations allow higher temperatures. Do not automatically use heat for protein stains, wool, unstable dyes, or elastic garments.
Pretreat stains rather than making temperature do all the work
Blood, grease, ink, and other stains behave differently. A targeted pretreatment often matters more than turning the dial hotter.
Washer temperature labels are not laboratory numbers
Cold, warm, and hot settings differ among machines and homes. For a specific infection-control need, follow the relevant health guidance plus garment and product instructions.
For an ordinary load, cold is a sensible starting point; move warmer only when the care label and soil give you a concrete reason.
Sources
- American Cleaning Institute — Cleaning Tips — Household cleaning, laundry care, stain treatment, and product-label guidance.