It's a debate that causes temperatures to rise in households up and down the country each year - when exactly should the central heating be turned off for the spring and summer?
Now, a survey of 2,000 people has settled the argument.
According to the research, the heating should be switched off when the outside temperature hits a consistent 15C or higher.
This means that many households might have turned off the heating during the unseasonably good weather in late March - and then turned it back on when temperatures plunged this week.
Stephen Day, director of boiler installation company iHeat, said: 'Once temperatures consistently hit around 15C - typically by mid to late April - many homes, particularly well-insulated ones, will be warm enough without needing continuous heating.
This makes now an ideal time to consider switching it off.' s According to the survey commissioned by boiler maker Worcester Bosch, men are usually the ones calling for the heating to be turned off.
But almost half of those surveyed are 'secret heaters' who turn the boiler back on behind their partner's back.
Keeping your heating on unnecessarily can prove costly.
'Even one day of unnecessary heating can cost households between around €7 and €14, depending on boiler type and usage,' said Mr Day.
