Do You Need to Preheat an Air Fryer? A Practical Guide

Why the advice varies between air fryers

The heating element and fan bring the cooking chamber up to temperature, while the basket and any approved accessories also warm up. A recipe timed from a cold start includes that warm-up; one timed after preheating does not. Swapping between the two can change how quickly food colours.

Manufacturer guidance illustrates the difference. Philips describes cooking without preheating on its Airfryer range page. Ninja’s published fish finger sandwich method specifies a three-minute AIR FRY preheat at 180°C. These are examples, rather than instructions for every Philips or Ninja appliance: check your exact model and programme.

Decide whether this cook needs a preheat

Start with the manual rather than a fixed internet rule. Look up the function you are using: AIR FRY, grill and bake settings on the same appliance can have different instructions. Then check the recipe or the frozen food’s air-fryer directions.

If the recipe assumes a preheated basket but your machine is designed for a cold start, follow the appliance’s method and use the recipe time as a point to start checking. Do not assume that subtracting or adding exactly three minutes will work for every food.

• Manual or programme requires preheating: complete that step first.
• Automatic preheat with an add-food prompt: wait for the prompt.
• Manual says preheating is unnecessary: start with that method.
• Recipe and manual disagree: follow the appliance’s operating instructions and check doneness carefully.

Smart tip

Save a note with your favourite recipe saying whether you started with a cold basket or a warm one. That small detail makes your next batch easier to repeat.

How to preheat when your model calls for it

Put the clean, dry basket and required crisper plate in their normal positions. Use the temperature and function specified by your recipe and permitted by the manual. Select the built-in preheat option, or run the empty unit for the duration your manufacturer specifies.

Keep loose baking paper and disposable liners out during preheating. Without food to weigh them down, airflow can lift them towards the heating element. Emerio’s AF-131371 manual explicitly requires removing baking paper before preheating without food. Keep ventilation openings clear and use the worktop clearance required by the manual.

When ready, open the drawer carefully, add the prepared food and start the cooking timer as directed. The basket will be hot, so use suitable utensils and avoid resting it on a surface that cannot tolerate heat.

What changes for a second batch?

A basket used moments ago is already warm. If your recipe was timed from a cold start, the next batch may brown sooner. Keep the food size and quantity similar and start looking before the original finishing time.

A warm basket does not mean every later batch is automatically cooked through. Check the centre of thicker foods, turn or shake as the recipe directs and avoid filling the drawer more deeply simply to finish sooner.

Preheating will not solve every cooking problem

If chips are pale and soft, look at crowding, surface moisture and whether you have shaken the basket before adding a longer preheat. If food colours outside while staying underdone in the middle, more starting heat may make that imbalance worse.

Change one thing at a time. Keep the food quantity and temperature steady, record the starting condition and adjust the cooking time in short intervals. For meat and other higher-risk foods, use appropriate food-safety checks rather than judging only by the colour of the outside.