There's no denying it, we're having a heatwave heavy summer in the U.K. But, while we're all struggling to keep cool, there's something else we need to worry about in this heat — our fridges.

I do my weekly online shop at Tesco, but I recently noticed I wasn't able to get some items because the fridges weren't working. And I'm sure I'm not the only one that's noticed the melting chocolate bars on the shelves. So, if the supermarkets aren't coping, how are our fridges going to keep up at home?

Well, if you've got an older fridge, it might be bad news. According to Dr Alan Foster, a refrigeration expert who spoke with the BBC, a lot of appliances were: "designed decades ago in a much cooler world."

Most were manufactured to cope with temperatures of up to 32C, and with temperatures rising, they're struggling to function. Some owners may even find their fridges stop working entirely.

If the current weather has got you considering a replacement fridge, here are the three things you should consider, according to an expert.

Buying a new fridge can be a pretty overwhelming purchase. There are so many to choose from and what works for your household might not work for someone else's. Fortunately, we spoke to Ilaria Castagnoli, Product Trainer at SMEG USA to find out her top tips for buying a replacement.

Unsurprisingly, if you're buying a replacement because your fridge can't handle the heat, you'll want to prioritise whether a newer model is Energy Star rated. Castagnoli says: "These units will be the most energy efficient options on the market, not only decreasing your energy use but also helping you save on your utility bill in the long run."

A fridge isn't one-size-fits-all and if you're combining it with a freezer, you've really got to think about what works for you and the other people in your household. "It's also important to think about the type of food you buy and the layout of the unit that will be easiest for you to manage on a daily basis," Castagnoli advises.

This means taking into consideration whether a bottom or top freezer works best for you, whether you'd prefer a side-by-side unit for easier access, or as Castagnoli also recommends: "Families who like to include ice in every beverage, or access filtered water regularly, should opt for a side-by-side or bottom freezer French door configuration." It all comes down to personal preference and needs.

"It's also important to think about the type of food you buy and the layout of the unit that will be easiest for you to manage on a daily basis."

Ilaria Castagnoli, Product Trainer at SMEG USA

If you're replacing an older fridge, chances are it hasn't got the features that are available on today's market, which are abundant especially when it comes to food freshness.

Castagnoli recommends: "Crisper drawers that offer independent temperature and humidity controls are an important consideration because fruits and vegetables often require higher humidity than the main cavity of the refrigerator provides, and different types of produce require different levels of humidity."

Additional features Castagnoli suggests looking out aside from food freshness include LEG lighting, adjustable shelving, and even whether a model offers a holiday mode.

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• Fridge struggling in the heat? Homeowners urged to make one change to stop food from spoiling
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• People are putting a piece of paper in their fridge to see if their home is heatwave-ready — and it makes more sense than you think

Grace is a freelance journalist working across homes, lifestyle, gaming and entertainment. You'll find her writing for Tom's Guide, TechRadar, Space.com, and other sites. If she's not rearranging her furniture, decluttering her home, or relaxing in front of the latest streaming series, she'll be typing fervently about any of her much-loved hobbies and interests. To aid her writing, she loves to head down internet rabbit holes for an unprecedented amount of time.