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How to Prepare for a Heatwave: Your Essential Electrical Checklist

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Every summer without fail, the same story plays out across the UK. The Met Office issues an amber heat warning, temperatures climb towards 30 °C, and within hours portable air conditioners and cooling fans disappear from shelves — online and in store. Delivery lead times stretch to weeks. Prices climb.

The households that stay comfortable are the ones that got ahead of the problem. They ordered their cooling equipment in spring, tested it, and knew exactly how to deploy it when the thermometer spiked. This guide helps you be one of those households.

Heatwave preparation is not just about comfort, either. Prolonged indoor heat above 26 °C is linked to poorer sleep, reduced concentration, and — particularly for older adults, young children, and those with health conditions — genuine risk. Getting the right electrical products in place is a practical safety decision as much as a comfort one.

A portable air conditioning unit is the single most effective way to cool a specific room quickly. Unlike a fan, which simply moves air around, an air conditioner actively removes heat and humidity from the air — making a genuine difference even when outdoor temperatures are extremely high.

The key specification to look at is BTU (British Thermal Units). As a rough guide:

Up to 7,000 BTU — suitable for small bedrooms up to around 15 m²

8,000–10,000 BTU — ideal for medium-sized living rooms and offices (15–25 m²)

12,000 BTU and above — for large open-plan rooms or spaces above 25 m²

You will also want to consider noise rating (dB), energy efficiency class, and whether the unit offers a heating mode — useful for year-round value. Units with programmable timers and remote controls add everyday convenience without significantly inflating cost.

Portable air conditioners need to vent hot air outside via an exhaust hose. Position the unit near a window and use the supplied window seal kit. If you cannot run the hose to a window, a ventilation kit through a wall vent is a good alternative.

 from leading brands, including units with advanced inverter technology, dual-function heating and cooling modes, and ultra-quiet night settings. Free UK delivery on orders over £100.

Installation tips before the heatwave arrives

Once your unit arrives, do not wait for hot weather to test it. Set it up straight away, run it for 20–30 minutes, and confirm the drainage and venting are working correctly. Some units require water to be emptied from a reservoir periodically — know how yours works before you need it at 2 am on a sweltering August night.

Not every room needs an air conditioner, and not every budget stretches to one. A high-quality electric fan is often the perfect solution for bedrooms, hallways, and utility rooms where you need airflow without the full investment of a portable AC unit.

Tower fans are particularly well suited to UK homes. Their slim profile means they fit into corners without eating up floor space, they tend to run quietly on lower settings — important for bedrooms — and their oscillating function distributes air across a wider area than a static desk fan. Look for models with a built-in timer, multiple speed settings, and — ideally — a sleep mode that gradually reduces speed as the night cools.

Pedestal fans offer stronger airflow for larger spaces such as living rooms. Some premium models feature DC motors that use up to 70% less energy than traditional AC motor fans — a meaningful saving if you are running one for hours each day throughout a heatwave.

Place a bowl of ice or a frozen water bottle in front of your fan. As the ice melts, the fan blows cool, slightly humidified air across the room — a low-cost way to drop the perceived temperature by several degrees.

 — from compact desk fans to large-capacity tower fans and industrial pedestal fans — with competitive prices and free delivery on qualifying orders.

Kitchens and bathrooms are the hottest, most humid rooms in your home on a summer's day — especially if you are cooking meals or showering regularly. An underperforming or absent extractor fan allows that heat and moisture to spread through the rest of the property, undoing all the hard work your cooling fan or air conditioner is doing elsewhere.

A well-rated bathroom extractor fan removes stale, steamy air and replaces it with fresh air drawn in through gaps in the building envelope. Run it during and after a shower and you will notice the difference immediately — the room cools faster and the humidity that makes heat feel unbearable is expelled.

In the kitchen, a good extractor fan above the hob removes the cooking heat that would otherwise radiate through the room and into adjacent spaces. If you are planning to cook during a heatwave, using the extractor fan throughout is one of the simplest ways to keep the house more bearable.

Key specifications include extract rate (measured in m³/hour or litres per second), noise level (sone or dB), and IP rating if the fan is fitted in a bathroom zone. A humidity-sensing fan — one that automatically activates when moisture levels rise — is an excellent investment for bathrooms, as it removes the need to remember to switch it on.

 covers 4-inch and 6-inch models from Airflow, Xpelair, EnviroVent, Vent Axia, and more — in a range of colours and finishes to suit any bathroom or kitchen. Many models include humidity sensors and timer functions.

Individual products only get you so far. The homes that stay genuinely cool during a heatwave combine multiple approaches into a coherent strategy. Here is how to think about it.

Cross-ventilation: using your home's layout

Open windows on opposite sides of the house during the cooler parts of the day — typically before 9 am and after 8 pm. This creates cross-ventilation: airflow that pulls cooler air in from one side and pushes warm air out the other. Close windows and blinds during the hottest hours (10 am–5 pm) to trap cooler air inside.

Stack ventilation: letting heat escape upwards

Heat rises. If your home has a loft hatch, stairwell, or high windows, opening these creates a stack effect: warm air escapes upwards and out, drawing cooler air in at lower levels. Combined with a ceiling fan or tower fan at ground level, this can meaningfully reduce indoor temperature without any air conditioning at all.

The most effective setup during a UK heatwave typically looks like this: a portable air conditioning unit in the room you use most in the evening (usually the bedroom), a tower fan on the landing or hallway to help move cooled air around, and extractor fans running in the kitchen and bathroom whenever those rooms are in use. Together, these products work as a system rather than in isolation.

You do not need to cool every room equally. Focus your air conditioning on the bedroom for sleeping comfort, use fans for daytime living areas, and rely on extractor fans to keep the utility rooms from radiating heat into the rest of the home.

This one surprises many people: your light bulbs contribute to indoor heat. Incandescent and halogen bulbs waste around 90% of their energy as heat rather than light. In a small room with several fittings, that adds up to a meaningful amount of unwanted warmth — especially over the long summer evenings when lights are on for hours.

Switching to LED bulbs before a heatwave is a quick, low-cost change that reduces both heat output and energy bills. A quality LED produces the same brightness as an old 60W incandescent using just 7–9W, and emits only a fraction of the heat. If you have not already made the switch throughout your home, now is an excellent time to do it.

Smart LED lighting goes a step further: dimming the lights during the hottest part of the evening further reduces heat output, and some smart systems allow you to schedule automatic dimming so you do not need to think about it.

 — covering LED bulbs, smart lighting systems, commercial fittings, and energy-efficient outdoor lighting. Switching to LED is one of the simplest and most effective ways to reduce your home's heat load this summer.

During a heatwave, the garden becomes an extension of your living space — often the most comfortable place to be during the day. Getting the outdoor area set up before extreme temperatures arrive means you have a comfortable retreat without having to rush to buy anything at peak prices.

Hot weather can affect outdoor electrical products. Check that any outdoor extension leads, socket covers, and garden lighting are rated for outdoor use (look for an IP44 or higher rating). UV and heat can degrade exposed cables over time, so inspect them before the summer season begins and replace anything that looks cracked or worn.

Garden power sockets and outdoor electrical installations should always be RCD-protected. If you are adding new outdoor sockets ahead of summer — perhaps to power a garden fan, a water feature, or outdoor speakers — use a qualified electrician and ensure any new work meets Part P of the Building Regulations.

 category covers a wide range of outdoor and domestic electrical products, including garden lighting, outdoor-rated accessories, and products to help you make the most of your outdoor space safely this summer.

Running more electrical equipment than usual — air conditioners, fans, cooling appliances — puts additional demand on your home's circuits. A few simple checks before the heatwave hits will keep everything running safely.

Never plug multiple high-wattage appliances into a single extension lead via daisy-chained adaptors. A portable air conditioner should always be plugged directly into a wall socket — not via an extension lead if avoidable, and never via a multi-way adaptor shared with other appliances.

If your home has an older fuse board without an RCD (Residual Current Device), a heatwave — which typically sees increased electrical usage — is a good reminder to have it reviewed by a qualified electrician. Modern consumer units provide significantly better protection against electrical faults, which can be exacerbated by heat stress on ageing wiring.

Summer storms often follow heatwaves, and lightning-related power surges can damage electronics. A surge-protected extension lead or a whole-home surge protector — fitted at the consumer unit — is inexpensive insurance against costly appliance damage.

From RCDs and MCBs to surge protection devices and consumer units, our 

 covers everything you need to upgrade your home's electrical safety ahead of summer.

Use this as a practical to-do list in the weeks before high temperatures arrive. Tick off each item and you will be far better placed than most households when the heat peaks.

 sized correctly for your most-used room — do not wait for a heat warning to be issued.

Test your air conditioning unit on arrival: run it for 30 minutes, check the venting and drainage work correctly.

 for living areas and hallways to circulate cooled air.

 are working at full capacity — clean the covers and check for blockages.

Replace any remaining incandescent or halogen bulbs with 

Inspect outdoor cables and garden electrical products for UV damage or cracking before the summer season begins.

Confirm your consumer unit has RCD protection — if not, arrange a review with a qualified electrician.

How to Prepare for a Heatwave: Your Essential Electrical Checklist

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