Why leaving heating on low all day costs more than you think

January 20, 2026

As winter settles in across the UK, energy costs have become a pressing concern for many households facing soaring bills. With temperatures plunging to as low as -10°C, and snowfall blanketing parts of the country, the debate over home heating practices intensifies. A common belief is that leaving the heating on at a low setting throughout the day is more cost-effective than only switching it on when needed. This assumption, however, could lead to unexpected increases in utility bills. Experts warn that continuous heating often results in higher energy consumption due to heat loss, especially in homes that aren’t perfectly insulated. Understanding the reality behind this heating method is crucial for making informed choices that can prevent financial strain this winter.

Understanding the Cost of Continuous Heating

There is a widespread misconception that keeping the heating on a low heat setting all day will prevent a house from getting cold and thus save money. Ryan Willdig from Heatforce succinctly quashes this myth, stating that it can indeed be more costly. When systems work to maintain a constant temperature, they expend far more energy than when heating is done on an as-needed basis. In essence, this approach leads to avoidable heat loss and unnecessary energy use.

The Expert Consensus on Thermostat Settings

Adjusting thermostat settings can be a game changer. Heating experts recommend programming your heater to switch on shortly before you need it. For example, setting it to come on about half an hour before waking up or arriving home from work not only ensures comfort but optimizes energy efficiency. This way, heat is applied when it’s most useful, avoiding the costs associated with heating empty rooms. Furthermore, maintaining your thermostat between 18°C and 21°C is advised, as even a slight reduction can lead to significant savings on energy bills.

Why Heating When Needed Is More Effective

A critical point made by industry professionals is that modern heating systems, particularly condensing boilers, are designed to warm spaces efficiently and quickly. Instead of engineering an entire day’s heating into the budget, which leads to the likelihood of wasted energy in unoccupied areas, simply activating the heating upon arrival allows for better temperature regulation. Particularly, homes outfitted with timers or smart thermostats can dramatically reduce overall energy bills by ensuring that heating only occurs when required.

Strategic Heating Approaches for Savings

Households should consider individual usage patterns alongside expert advice. For those spending prolonged periods at home, such as evenings and weekends, it may be worth maintaining a slightly higher temperature at all times in well-insulated houses. Conversely, if the residence is primarily unoccupied during the day, keeping the heating off or at a significantly reduced temperature can lead to substantial savings. According to Kevin Pennington of Lancashire Air Conditioning, it’s wise to program heating to resume shortly before people return home, avoiding wasted energy overall.

Final Thoughts on Heating Efficiently

As winter progresses and temperatures drop, it’s essential to remain vigilant about heating costs. The seemingly innocent habit of leaving the heating on low all day could be a source of unnecessary expense. By adopting a smarter approach and adjusting thermostat settings intelligently, households can significantly cut heating expenses while maintaining comfortable living conditions. The call for energy efficiency resonates now more than ever, making it crucial to implement these practical tips for winter. With the right strategies in place, cost saving and comfort can go hand in hand, even in the coldest months.