Heating experts have identified the exact date UK households should turn their heating back on as temperatures fall, with the date based on Met Office data from a recent five-year period to 2024. According to Best Heating, October 20 is the day the thermostat should be switched back on.
The NHS advises households to put their heating on when the outside temperature drops below 15C, and to heat their home to at least 18C if they have a health condition, are not very mobile, or are aged 65 or over. Babies should sleep in rooms between 16C and 20C, the NHS says.
Why October 20 is the key date
Best Heating said: “Once temperatures outside drop below 15° Celsius (C) the NHS advises to put heating on for health reasons, which means that, in line with Met Office data, the date we can expect to use our heating is October 20th.”
“From this date, temperatures aren’t expected to rise above 15°C for the rest of the year, although 2022 was a particularly warm year and saw temperatures of up to 23°C in October (29th).”
“If we are to have similar weather this autumn, then it will be around November 2nd until the boiler is required to work hard.”
Health risks and financial concerns
“Whilst there isn’t an optimum time to switch heating on, our research shows that once temperatures are below 15°C, usually in the middle of October, it is best to turn the heating on as we feel the chill more.”
“By the end of the month, even the hardiest among us will have our heating on to keep warm as temperatures are predicted to drop even further.”
“If it is below 13°C outside then health issues can arise, especially in vulnerable people.”
“With many worried about their finances, it can be tempting to hold off putting the heating on but be careful delaying this too long as this can hurt your body.”
“For those struggling, we recommend contacting your local council or energy supplier as there are often grants and help available to keep you safe and warm throughout winter.”
Check your heating before turning it on
According to Adam Knight, lead engineer at home heating and cooling experts BOXT, the date is October 18. But those turning on their heating for the first time need to check before the heating goes back on - as this is the 'worst time' to discover a problem that could cost you £450.
He said: "The worst time to discover a problem with your heating is when the temperature has suddenly dipped and everyone else is trying to book an engineer."
“Testing your heating early gives you time to spot the warning signs and get them dealt with before a small issue turns into a breakdown.”
Homeowners should expect to pay around £300, according to current 2026 figures, while an emergency repair can average around £450.
