Have you ever been left with the nagging feeling that you could have got a better energy deal or chosen a firm with better service?
Price comparison websites are the most popular way to switch energy supplier, according to our research involving thousands of energy customers, plus most switchers found the process with them easy.
Following a few expert tips will help give you the peace of mind that you've found the best tariff or supplier for you.
And they're worth knowing about - our research revealed you could miss out on £50 of savings per year, or otherwise pick a supplier with poor service.
Whether you're using a price comparison website, autoswitching service or contacting an energy company directly, read on for tips on getting the best deal for you.
Using a price comparison website saves you the hassle of checking the prices of tariffs with each energy company - you get a list of quotes upfront. It can then be as simple as picking one and signing up without even leaving the website.
But if you venture no further than the initial list of tariffs presented to you on one price comparison website, you risk missing out on £50 of savings per year.
Many price comparison websites' initial list of recommended tariffs doesn't typically include all available tariffs on the market. It usually won't show those that the website cannot switch you to directly.
This can make your life easier - you might not want the hassle of finding the best deal for you and then having to re-enter all your details on the company's site to sign up.
But it's something to bear in mind if you're on a quest for the very cheapest deal.
Price comparison websites also have exclusive deals with some energy firms. This means that a cheap deal from a company offered on one website may not be available via another.
David Philips from Surrey discovered for himself some of things to beware of when shopping on comparison sites. He told us: 'I have used several energy price comparison websites and feel that not showing the whole of the market as the initial default is deceptive because it does not show the cheapest overall deal.
'It restricts choice to deals you can click directly onto, presumably involving commission to the site. You have to select your own filters to see all available deals.
'Recently I received an alert saying I could save £100 on energy, so I clicked through and switched to the best deal. But I realised I had only seen the default view on the price comparison website and might have got sucked into a deal that wasn't the best.
'So I checked the whole of the market and cancelled the first switch because it was not the best. Instead I switched to another firm.'
Besides price, picking an energy firm whose service is up to scratch is important - especially if things go wrong.
Our annual survey of more than 8,000 energy customers reveals how suppliers compare on customer service, complaints, value for money and more.
Our comparison website Which? Switch shows our latest ratings alongside companies' prices so you can take them into account when you pick a firm.
More than half of those people who switched energy supplier used comparison websites*. They're much more popular than going direct to energy companies, and new autoswitching services have a long way to go to catch up.
Perhaps it's no wonder they were also the method that switchers found easiest, according to our research. Some 87% said they found the process of switching using a price comparison website easy or very easy.
That compares with 85% finding the process via an energy company's website easy, but 69% finding switching easy when using an autoswitching service.
Bob Williamson from Angus believes that 'price comparison websites make assumptions about the tariff you will go onto at the end of your fixed deal.
'But it was unexpected that, as a result, some of the major energy companies appear and it states that you will save money with them when in fact you would definitely be paying more. I would expect the price comparison website to compare against the current tariff and then the cheapest beyond that, but they don't.
'When I last switched, I went directly to the energy firm, as it wasn't switchable through the price comparison website.'
When you next come to switch energy supplier, follow these simple tips to make sure you're happy with the company and tariff you pick.
It requires a little extra effort but will pay off in the benefits to your finances, your satisfaction with the company you choose, and your peace of mind.
Savings are based on a medium user (using Ofgem averages of 3,100kWh electricity and 12,000kWh gas per year), paying by direct debit, with paperless bills, in the east of England in December 2019. Prices were checked across five of the biggest price comparison websites, as well as whole of available market data provided by Energylinx.
*We conducted an online survey of 8,385 members of the UK general public in September 2019.