Top 9 Home Energy Myths

josh jackman
Written By
Updated on 21 December 2022

Turning your thermostat from 20°C to 18°C could save you £560 per year

You lose 35% of your home’s heat through the walls

Leaving your TV on standby has basically no effect on the environment

We all have misconceptions when it comes to our home energy use. There’s no home energy class at school, and trying to talk to your cool teen friends about it wouldn’t have gone down well.

So you learn from family, or whoever else you can, and sometimes that means hearing stories with a dubious relationship with reality – which isn’t enough.

It’s crucial to know how best to heat and cool your surroundings, so you can live your best, most temperate life.

So stop painting your radiators black (because it almost certainly won’t help), shut the door to stop the heat getting out, and read on as we debunk the nine most pervasive home energy myths of our time.

a couple sitting on a sofa

Putting the TV on standby is good; turning it off at the mains is basically pointless

It doesn’t cool the room; it cools you.

The air feels cold when it hits your skin because it’s moving faster than normal, but the air temperature itself doesn’t change.

This means you should switch off a fan if you’re leaving the room, or you’ll be wasting energy – and money – for no good reason.

If you want to cool down a room for real, use an air conditioner, which physically removes the heat from a space.

Gone are the days of being forced to wash everything you own by hand – but are we dooming the planet by wasting water on perpetuating our laziness?

Nope.

As it turns out, there are no longer any environmental downsides to this technological development, because you use more hot water cleaning by hand than by machine.

So it’s much better for Mother Earth if you put your dirty crockery into the dishwasher, switch it onto an eco-friendly setting, and kick back with a conscience as clean as your plates.

Modern technology truly is a wonder.

We understand why this misconception has spread.

After all, it makes intuitive sense. Leaving anything plugged in all year long must require a massive chunk of energy; it’s just common sense.

Except it doesn’t.

Modern-day chargers, whether they’re for mobiles, laptops, or tablets, use a tiny amount of electricity when they’re not charging your devices – just 0.438 kilowatt hours (kWh) per year, according to a study by How-To Geek.

This means that by keeping them unplugged, the average person in the UK would save 6.29p – per year.

Your oven uses more energy in 20 minutes than your unused charger does in a year – and the savings are similarly small when it comes to your TV.

So don’t waste your time on plugging and unplugging chargers.

If you want to help fight climate change and save the planet while powering your home, focus on making other, more effective changes – like using solar panels.

The idea that most of your home’s heat is lost through your windows is similar to the notion that you lose the majority of your body heat from your head – because they’re both untrue.

Windows and draughts are responsible for 25% of your heat loss, which pales in comparison to the 35% you lose through your walls, according to The Guardian.

Another 25% exits your home through the roof, while the remaining 15% escapes through the floor.

Where you lose heat from your home

So instead of banning anyone you live with from opening the windows, focus on getting your walls insulated.

That’ll stop more heat from escaping, making for a warmer, less expensive, more energy-efficient life.

Want to find out how much it’ll cost you to get double glazed windows? Check out our Double Glazing Costs page.

Setting an ambitious goal can be good for your productivity – for instance, if you aim to clean your whole home in a day, and end up only cleaning the kitchen and bathroom, you’ve still achieved plenty.

But your thermostat doesn’t have this kind of psychology. In fact, for the next few years at least, it doesn’t have any kind of mentality.

If you raise the target temperature beyond the number of degrees you actually want, the machine will heat up your home at the same speed; it’ll just heat up your home for longer.

Did You Know

Turning your thermostat down from 20°C to 18°C can save you up to £560 per year, according to a government-sponsored study and the average price per kWh.

That’s because it’s trying to reach the level you set for it, even though you never really wanted to sit in 40°C heat.

And once it’s climbed that mountain and set the air around you on fire, you’ll inevitably need to use your air conditioner to cool the place down, compounding your initial mistake and using even more unnecessary energy.

Keep it simple: set your thermostat for the temperature you actually want.

This myth has precisely zero scientific basis.

In reality, each room that’s getting heated will get warmer if you shut its doors, allowing the hot air in the space to circulate and then get warm again.

If you leave all the doors open, you’ll let the heat leave the room and disperse, making it much less effective.

Even if you’re heating every room in your home at the same time (which you ought to avoid), you should shut all the doors. Keep the heat in a small area, and you’ll be golden.

a person turns up their thermometer

This is nothing. Stop it. Choose the temperature you want

This sounds sensible – limit the space your air conditioner or heater has to service, and you can reduce the energy you use, right?

Unfortunately, it’s not that simple.

All you’ll do by closing your vents is increase the air pressure within the ducts of your heating and cooling system. This pressure can lead to air leaks, which will reduce the lifespan of your unit.

The vents need to vent – and the best thing you can do is let them.

For the sake of your bank balance – not to mention the Earth itself – please don’t do this.

There is no point heating rooms you’re not in, unless you’re some sort of supervillain who wants to slightly speed up the effects of climate change.

You’ll use a tremendous, gratuitous amount of energy, and achieve nothing else. If you’re worried about some parts of your home being cold, those rooms can handle it.

Instead, switch the heating on in the rooms people are in, and let your heating stop working when possible.

After all, most homes are very talented at holding onto heat, having been built with this need in mind. Trust them to do their thing, and stop wasting money and energy.

The idea that you should leave your heating on constantly is in the same bracket as the idea that turning lights off uses more energy than leaving them on all the time – which is also untrue.

It produces a tiny spike of energy when you press a light switch, but this is nothing compared to the sizable environmental benefits associated with turning lights off.

It can be hard to separate fact from fiction when it comes to the best ways to save energy and money on your heating, lights, and water.

Hopefully, by debunking these myths, we’ve given you the tools you need to live your best home energy life.

So go, fly like the wind, and put these tips into action – you’ll be better off in no time.

Written by

josh jackman

Josh has written about and reported on eco-friendly home improvements and climate change for the past four years.

His data-driven work has featured on the front page of the Financial Times and in publications including The Independent, Telegraph, Times, Sun, Daily Express, and Fox News, earned him the position of resident expert in BT's smart home tech initiative, and been referenced in official United Nations and World Health Organisation documents.

He’s also been interviewed on BBC One's Rip-Off Britain, BBC Radio 4, and BBC Radio 5 Live as an expert on everything from renewable energy to government policy and space travel's carbon footprint, and regularly attends Grand Designs Live as a Green Living Expert, giving bespoke advice to members of the public about heat pumps and solar panels.

Josh has also used the journalistic skills he developed at The Jewish Chronicle and PinkNews to investigate and analyse every green government grant in existence, and examine the impact on the climate of cryptocurrency, Glastonbury Festival, and the World Cup.

You can get in touch with Josh via email.

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