These 3 Common Holiday Decorating Faux Pas Could Be Costing You Double on Your Energy Bills – Here's How to Fix Them Instantly

They seem innocuous, but they can have a big impact at the most expensive time of the year

A cozy living room decorated for Christmas. Close up of a blue upholstered arm chair beside a fireplace with a stocking hanging from a garland on the mantel. The edge of a tree in the foreground.
(Image credit: Nkuku)

It wouldn't be the holidays without stunning holiday decor to cozy up your home. However, a few common mistakes could be driving up your energy bills at an already costly time of the year.

From blocking heat vents to leaving lights on, it all adds up to increased costs.

5 Holiday Decorating Mistakes That Spike Your Energy Bills

1. Decor Blocking Heat Vents

A white living room decorated for the holidays with glass and metal ornaments

Blocked vents or radiators can drastically reduce efficiency and damage your decor.

(Image credit: The White Company)

We are all looking for ways to make heating more efficient in winter so that we can keep cozy for less. Our efforts can quickly be dampened by badly placed decor blocking heat vents or radiators, however.

Brooke Stafford, senior service manager at Domestic & General, begins, 'You should avoid covering air vents with rugs or furniture to make space for holiday decorations. It might seem harmless for a month or so of celebrations, but your heating and cooling systems rely on a steady airflow for efficiency.

'By blocking those vents, your system will be pushed to work under strain, which can not only lead to higher bills but can also cause unnecessary wear on the unit,' she warns. 'Blocking vents is also a fire hazard, so it’s best to leave them uncovered at all times.'

This doesn't mean you have to pare back your collection and stick only to minimalist Christmas decor. Rather, it is about smart placement. You can ensure heat vents remain free by adding some air vent deflectors from Walmart, helping to create a physical barricade against blocks while better directing heat into your room for even warmth.

2. Leaving Lights on Constantly

A dining room decorated for the holidays with a large Christmas tree and a seasonal centerpiece

LED lights are more efficient, but they can still sap energy when left on all the time.

(Image credit: Lulu and Georgia)

It simply would not be Christmas without twinkling Christmas light ideas. However, while modern LEDs are incredibly efficient, they can still increase energy bills when left on all the time.

We get it – crawling beneath the tree every night to turn them off is far from practical, but there are a whole host of practical solutions, from outlet timers from Walmart, to Amazon Smart Plugs, that can make saving money at home simple, says Martyn Fowler, founder of Elite Renewables.

He explains, 'Leaving decorative lights on around the clock adds to your electricity bill and can create unnecessary heat loads that can mess with your thermostat readings.

'Additionally, if you’re still using older incandescent lights, I’d recommend switching to LEDs with a smart plug so they’re only on when needed.'

3. Blocking Thermostats

A lit fireplace with traditional Christmas stockings hung across the white mantel.

A blocked thermostat can reduce heating efficiency.

(Image credit: Tori Murphy)

One of the biggest Christmas decorating problems that fly beneath the radar is decorating too close to your home's thermostat, Brooke continues.

'It is the easiest way to run up bills that homeowners often overlook,' she warns. 'Placing larger decor items, such as a wreath or a tall figurine, in front of the thermostat can trap warm or cool air around it. By restricting the airflow, you can trick your heating or cooling system into running longer than it needs to, which can increase your bill.'

Chris Hunter, director of customer relations at SaaS company ServiceTitan, adds, 'My biggest tip is to keep decorative lights a safe distance from your thermostat. Lights give off heat and are often plugged in near the same wall, which can cause false temperature readings. That leads your HVAC system to run less efficiently.'

This rule applies no matter what kind of thermostat you have, be it an old mechanical model or a smart thermostat.

Meet the Experts

Brooke Stafford
Brooke Stafford

Brooke Stafford is a seasoned appliance repair expert, spending the past eight years in the appliance service industry, including five years leading operations at Sears Home Services. As Senior Service Manager at Domestic & General US, Brooke specializes in supporting homeowners in ensuring they get the best performance and longest life from essential appliances like washing machines and refrigerators. 

Martyn Fowler
Martyn Fowler

Founder of Elite Renewables, Martyn Fowler, is a leading renewable technology experts, working with heat pumps and HVAC systems for the last two decades. His passion for decarbonisation, matched with a deep technical experience of the technology, makes him one of the industry's go-to experts for all things renewable.

Chris Hunter
Chris Hunter

Chris Hunter is an experienced professional at ServiceTitan, where he leverages his expertise to help drive business growth and operational efficiency within the company. 


It isn't just your holiday decor that can impact your bills. There are several common heating mistakes, such as not cleaning filters and skipping maintenance, that can drive up costs throughout winter, too.

Chiana Dickson
Content Editor

Chiana has been at Homes & Gardens for two years and is our resident 'queen' of non-toxic living. She spends most of her time producing content for the Solved section of the website, helping readers get the most out of their homes through clever decluttering, cleaning, and tidying tips. She was named one of Fixr's top home improvement journalists in 2024.

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