A long-standing piece of advice in the UK — keeping your home at 19°C during winter — is now being challenged by heating experts, consumer groups, and energy-efficiency specialists. New guidance suggests that 20°C is the more realistic and comfortable benchmark for modern British homes, marking one of the first major shifts in official thermostat recommendations in decades.
For roughly 50 years, the “19-degree rule” filtered into public consciousness through energy-saving campaigns of the 1970s. But according to new reports this winter, that rule no longer reflects how people live today. Improvements in insulation, changes in building design, and the fact that people spend more time at home than previous generations all point toward slightly warmer baseline temperatures being appropriate.
A More Flexible, Room-by-Room Approach
Alongside the shift from 19°C to 20°C, many experts now favour a zoned heating strategy instead of a single house-wide temperature. This means heating different rooms to different levels depending on their use:
- Living rooms: around 20°C
- Bedrooms: 16–18°C
- Bathrooms during use: around 22°C
- Hallways and landings: roughly 17°C
This approach is designed to improve comfort while keeping energy bills under control. Smart thermostats and TRVs (thermostatic radiator valves) make this easier for homeowners to implement, allowing much finer control than a traditional single wall thermostat.
Common Thermostat Mistakes Are Still Costing Households
A recent round-up of common thermostat mistakes highlights the errors many households still make. These include turning the thermostat up too high to heat rooms faster (it doesn’t work), placing the thermostat near a heat source or draft, or failing to use scheduled heating at all. The guidance reinforces that small behavioural changes can noticeably reduce energy use without sacrificing comfort.
Why This Matters Now
The conversation around thermostat settings is particularly relevant this winter following cuts to national insulation and energy-efficiency support schemes. With fewer households eligible for upgrades, a growing number of people will be relying on careful heating management to balance warmth and cost.
From a home-comfort perspective, the move toward 20°C is also significant. Many households—especially families with children or older occupants—already heat to around this level. The new guidance effectively brings official advice closer to real-world behaviour.
What This Means for Homeowners
For most modern or reasonably insulated UK homes, 20°C is now seen as a comfortable, efficient, and healthy starting point for living areas. Combined with zoned heating and better-sealed windows and doors, keeping heat in the property is more achievable than ever.
At Colin’s Sash Windows, we see rising interest in energy-efficient sash windows, composite doors, and slim-sightline aluminium and steel internal products — all of which contribute to maintaining consistent indoor temperatures without excessive reliance on the boiler.
Summary
- Experts now recommend 20°C for main living spaces, replacing the outdated 19°C rule.
- Zoned heating is encouraged: warmer lounges, cooler bedrooms, and targeted heating in bathrooms.
- Efficient windows and doors can help hold that temperature without increasing bills.
- With national insulation support reduced, heating habits will play a bigger role this winter.
If you’d like advice on improving thermal performance through glazing upgrades, replacement sash windows, or modern internal steel partitions, our team at Colin’s Sash Windows can provide tailored recommendations for UK homes.
