Around 11 million consumers will overheat their homes, adding at least £1.4 billion to their energy bills.
That’s according to a new report from uSwitch.com.
It adds Londoners are the UK’s “heating addicts” as nearly two in five (39%) increase their thermostat above 21°C.
However it states those in the East Midlands are the most temperature-conscious.
The report adds more than half (52%) of consumers mistakenly believe that ramping up the thermostat to above the desired temperature will heat their home more quickly.
The recommended temperature for homes in the winter is between 18°C and 21°C and turning up the dial by just one degree can increase annual energy bills by 10%, it claims.
Tom Lyon, Energy Expert at uSwitch.com, said: “Using, or installing, a timer to control your heating is a good way to match the temperature with your schedule at home – for example programming it for when you’re coming back from work, or getting up in the morning.
“Now, before winter sets in, is also a good opportunity to consider switching to a cheaper energy deal. This takes a matter of minutes and could cut annual bills by as much as £300.”