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Freeze your pillow cases so they are cold for going to bed.

Fill a hot water bottle with cold water and freeze it.

Keep curtains, blinds and windows shut when the sun is shining directly on them.

Open windows and night and close them during the day.

Open windows on opposite walls or at opposite ends of the house to create a cross-breeze.

Set fans on the ground floor and point towards a far wall with no large objects in the way - to bounce cooler air back into the room.

Ms mathie's three key tips aree: Only let cold air in, keep hot air out and limit solar gain - the heat that's generated through sunlight hitting windows. 'Most people don't need to rely on energy guzzling gadgets to keep cool as there are a few simple tricks you can use to keep the temperature down inside.' Natalie Mathie, energy spokeswoman at, said: 'Energy prices may be falling on July 1, but costs can still add up when trying to stay cool in a heatwave, especially if your air conditioning unit is running around the clock. As the year's first heat health alert was issued ahead of a forecast 30C heatwave in England and Wales, uSwitch calculated the two million UK households with an air conditioning unit face a £71 million weekly energy bill.

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