With temperatures hitting minus eight in some parts of the country this weekend many people, if they can afford it, will be turning up the heating controls in their home.
Energy companies of course will be rubbing their hands with glee as our consumption rises over the festive period.
Households are on average paying more than £100 per month for gas and electricity but in recent weeks a price war has broken out - if you have access to the internet.
Those people taking advantage of web deals are saving themselves up to 25% or £300 a year, but is that fair on people who choose to pay a different way? And with so many energy tariffs to choose from how do you know you are getting a good deal anyway?
Money Box heard from Joe Malinowski from the comparison site, The Energy Shop. And also from Phil Levermore from the energy supplier Ebico.
This item was first broadcast on Radio 4's Money Box on Saturday, 19 December 2009