5 ways you’re wasting energy with your Christmas decorations — but these easy tweaks will fix them fast
Help keep your bills as low as possible throughout the festive season
Whether you've already had yours up for a while, or your still waiting to put your Christmas decorations up, there's no doubt that these festive additions can elevate our homes. But could they be elevating your energy bills too?
With temperatures dropping and days getting shorter, households use more energy at this time of year to keep their homes warm and well-lit, which means higher bills during an already expensive season.
An obvious way to combat this is to try and save energy in your home. Just make sure you're avoiding these Christmas decorating mistakes that are secretly increasing your bills!
1. Blocking radiators with decorations
Making sure your Christmas tree (or furniture) is not blocking your radiator will allow it to work most efficiently, keeping your energy bills as low as possible
Whether it's your Christmas tree, or furniture you've moved to make space for it, blocking your radiators can have a significant impact on your energy bills.
'When a radiator is obstructed, the heat gets trapped rather than circulating around the room, which means your boiler needs to work harder and longer to reach the set temperature,' explains Katie Lillywhite AO’s appliance expert. 'That means your boiler has to work harder and longer to reach the temperature you’ve set, which results in higher energy use and higher bills.'
Instead, you should keep decorations and furniture as far away from radiators as your layout will allow. 'Even pulling furniture and decorations just a few inches forward helps warm air circulate much more freely,' adds Katie.
Minimise the need to block your radiators by opting for one of these space saving Christmas trees.
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2. The mode you have your Christmas lights on
While many people will have already upgraded old incandescent Christmas lights with energy-efficient LED alternatives, the mode you choose while they are on can also impact your energy bills.
'LED Christmas lights are relatively low-cost to run, but that doesn’t mean they should be left on constantly,' says George Penny, Energy Expert at The Solar Co. 'Using them for eight hours a day is reasonable, but extending that to 12 or more hours, especially when nobody is around to enjoy them, can quickly eat into your energy budget.' If you need to upgrade, these multi-coloured LED lights from Habitat (£12) have a great price point.
'The type of lights and the mode they’re set to also matters. For example, flashing or twinkling modes tend to use far less energy than having lights on continuously, offering energy savings of up to 64% for some products. If you’re running multiple indoor and outdoor displays, switching to more efficient settings can make a noticeable difference.'
If you want to upgrade your lights, I love these options below:
3. Not using a timer for your lights
Another error people make when it comes to their festive decs is that they don't use a timer. That means lights can be left on for longer than necessary, sometimes even when no-one is home. In the case of any outdoor lights, if you forget to turn them off, they can be on all night, using energy when no-one is awake to enjoy them.
'The easiest way to keep costs down is to use a smart plug so your lights only come on when you want them to,' advises Katie. 'If you have a smart speaker, you can also ask Alexa to turn your lights on for you.'
4. Putting decorations too close to your thermostat
If your thermostat is located in your hallway, make sure you don't block it with decorations, otherwise you could disrupt how well it works
Similar to how putting decorations too close to your radiators can unnecessarily increase your energy bills, so too can putting decorations over your thermostat.
'This can trick them into reading the room temperature incorrectly, says Nicholas Auckland, heating, cooling and energy expert and Managing Director of Trade Radiators. 'If a thermostat thinks the room is warmer than it actually is, then the heating could shut off too early. Similarly, if it thinks the room is colder than it really is, then the boiler will fire for longer than needed which will increase energy costs.'
5. Hanging large, bulky decorations in windows
Keep window decorations minimal to ensure you still benefit from any solar gain in the festive period
Putting beautiful decorations in your windows is hugely popular, especially if you want to give your home festive kerb appeal without going to the full extent of external decorations. But it turns out this could be negatively impacting your energy bills.
'Try not to put bulky decorations or heavy displays in front of windows as this can obstruct natural sunlight,' explains Stuart Middleton, Consumer Energy Expert at So Energy. 'During winter, every bit of daylight contributes to warming your home for free, so leaving windows free from decorations can help maximise heat even on the shorter winter days.'
If you do want to put decorations in your windows, keep them small and delicate so it minimises how much daylight they block.
To further reduce your home's energy usage over the festive period, you could also try Martin Lewis' tactical 4pm rule, or some more simple home upgrades to make your home feel warmer.

Sarah Handley is Ideal Home’s Renovation Editor. She joined the team full time in September 2024, following three years of looking after the site's home finance content. As well as all things renovation, Sarah also looks after our Home Energy content, which covers all aspects of heating and insulation as well as tips on how homeowners can reduce their energy usage. She has been a journalist since 2007 and has worked for a range of titles including Homebuilding & Renovating, Real Homes, GoodtoKnow, The Money Edit and more.