Martin Lewis Warns Against Leaving Heating On Low All Day

As colder temperatures settle in, financial expert Martin Lewis cautions homeowners against leaving their heating on low throughout the day. This guidance comes as many prepare for the autumn months, when energy consumption typically increases due to cooler weather.

According to the Energy Saving Trust, it is advisable to turn on heating only when necessary, particularly for vulnerable individuals such as the elderly or those with medical conditions. The organization suggests activating heating approximately thirty minutes before waking up to ensure a comfortable morning environment.

The debate surrounding the effectiveness of keeping heating on low has persisted for years. On the daytime programme This Morning, Lewis stated, “They say it’s better to only put the heating on when you need it. You pay to pump energy in as and when is needed, and to keep pumping it in constantly isn’t efficient.” He emphasized that utilizing a timer is a more cost-effective approach, as thermostats are designed to regulate heating based on set temperatures.

Many people believe that maintaining a low heat will not significantly impact their energy bills. Lewis offered insights on this perspective, noting, “There are some engineers who argue that keeping the heating on low with all the radiators on can work as it reduces condensation.” Nevertheless, he warned that turning off the heating can lead to moisture collecting within walls, which may result in faster heat loss.

The Energy Saving Trust supports Lewis’s view, stating on its website that keeping heating on consistently will increase energy consumption and costs. It is generally more energy-efficient and financially prudent to activate the boiler only when needed. For those with heat pumps, the situation differs; leaving the heating on all day could lead to savings, as these systems are highly efficient and powered by electricity.

In a development that could further impact household energy bills, Ofgem announced that the price most households pay for gas and electricity will rise by an average of 2% starting on October 1, 2025. The new Energy Price Cap will increase bills by approximately £2.93 monthly for the average household. This change will raise the cost for homes on default tariffs to about £102 per month, an increase from the current £100.

Current figures reveal that over a third of customers, specifically 37%, are now on fixed tariffs, which protect them from the impending price rise. Lewis has consistently advocated for consumers to secure fixed tariffs to avoid such increases.

On social media, Lewis reiterated his concerns about the Ofgem price cap, remarking, “It is a pants cap; most on it could save hundreds by ditching it.” He stressed that the majority of households on default tariffs could potentially save nearly 15% by switching to fixed rates.

As the colder months approach, homeowners are encouraged to consider their heating strategies carefully, balancing comfort with cost-effectiveness while navigating the changes in energy pricing.