Quick answer: Most air fryers don’t strictly need preheating, but a short 3-minute preheat at your cooking temperature gives crispier results for frozen chips, breaded food, steak, pastry and anything baked. You can skip it for reheating leftovers, roasting most vegetables, baked potatoes and delicate fish. Always follow your manual first: Philips says its Airfryers don’t need preheating, while some Ninja manuals recommend it for best results.
Preheating is one of the most common questions new air fryer owners ask, and the honest answer is “it depends on the food, not just the machine”. Below is a food-by-food table, how long to preheat each type of air fryer, what it costs, and how to adjust cooking times if you skip it.
Do You Need to Preheat an Air Fryer?
No, not for every meal. An air fryer is a small, powerful convection oven, so it reaches temperature in a couple of minutes anyway. Food put into a cold basket simply spends the first 2–3 minutes warming up with the machine, and the overall cooking time is a little longer.
Where preheating really helps is texture. Food that goes into hot air and a hot basket starts browning and crisping straight away, instead of slowly drying out first. That’s the difference between frozen chips that are golden and crunchy and ones that are pale and slightly chewy. It’s also why most of our time-and-temperature guides, like frozen chips and steak, give the best results with a quick preheat.
What manufacturers say varies by brand:
- Philips: its support pages state you do not need to preheat a Philips Airfryer; you can add ingredients straight away.
- Ninja: some manuals (for example the Air Fryer Max AF160) recommend preheating before adding ingredients for best results.
- Instant Vortex, Cosori and others: many models have a preheat button or a built-in preheat stage that beeps or shows “Add Food” when ready.
If your manual says preheat, preheat. If it says nothing, use the chart below.
Should You Preheat? Chart by Food
| Food | Preheat? | Why |
|---|---|---|
| Frozen chips, fries and wedges | Yes, 3 min | Hot start gives a crisp, golden outside |
| Breaded or battered frozen food (nuggets, fish fingers, scampi) | Yes, 3 min | Coating sets and crisps before it softens |
| Steak, lamb chops, pork chops | Yes, 3–5 min | Better browning on the outside without overcooking the middle |
| Cakes, muffins, brownies, cookies | Yes, 3–5 min | Baking chemistry relies on the right temperature from the start |
| Puff pastry, sausage rolls, croissants | Yes, 3 min | Steam puffs the layers before the butter melts out |
| Chicken wings and thighs | Optional | Long cook time, so it makes little difference |
| Raw vegetables (broccoli, sprouts, peppers) | Optional | Slightly crispier edges with a preheat |
| Baked potatoes, whole sweet potatoes | No | 40+ minute cook; a preheat adds nothing |
| Reheating leftovers | No | A gentler start stops the outside drying out |
| Delicate fish (cod, salmon fillets) | No | Easier to avoid overcooking the thin ends |
| Eggs in their shell | Follow the recipe | Our air fryer boiled eggs times start from a cold basket |
For exact times by food, use our air fryer cooking time calculator.
How Long to Preheat an Air Fryer
Most basket air fryers reach cooking temperature in 2–5 minutes. As a rule of thumb:
| Air fryer type | Typical preheat at 180–200°C (350–400°F) |
|---|---|
| Compact basket (2–4 L) | 2–3 minutes |
| Standard basket (4–6 L) | 3 minutes |
| Large or dual-basket (7–10 L) | 3–5 minutes |
| Air fryer oven (10–25 L) | 4–6 minutes |
Lower temperatures need a little less time; 200°C needs a little more than 160°C. If your machine has a preheat function, it will stop and alert you when it’s ready, so there’s no guesswork.
Does preheating waste electricity?
Barely. A 1,500 W air fryer running for 3 minutes uses about 0.075 kWh. That’s about 2p in the UK under the October–December 2026 price cap, or around 1.2¢ in Toronto. Even preheating every day adds only a few pounds or dollars a year. Our guide to how many watts an air fryer uses shows the full running costs.
How to Preheat an Air Fryer (Step by Step)
- Put the empty basket or drawer in place. Most air fryers won’t run without it, and a hot basket helps crisp the bottom of the food.
- Set the temperature your recipe needs, for example 200°C (400°F) for frozen chips.
- Use the preheat button if you have one. If not, set the timer for 3 minutes and press start.
- Add the food as soon as it’s ready, in a single layer, then set your cooking time. Work quickly so you don’t lose heat.
- Add oil or liners only now, not before preheating. Loose parchment, foil or paper can be blown into the heating element.
On a dual-zone machine, preheat both drawers together if you’re cooking two foods at once. Our multi-food cooking planner times them so they finish together.
What Happens If You Don’t Preheat?
Nothing bad, as long as the food is cooked through. You’ll usually notice:
- Slightly longer cooking. Add 2–3 minutes to any recipe written for a preheated air fryer.
- Less browning and crunch, especially on frozen and breaded food.
- Less even results on bakes like muffins, which may rise unevenly.
Always judge doneness by temperature and colour, not the timer. Chicken should reach 74°C (165°F) in the thickest part, and pork 63°C (145°F) followed by a short rest. If your food isn’t crisping even with a preheat, the cause is usually overcrowding or moisture; see why your air fryer food isn’t crispy.
Converting an oven recipe? Recipes for conventional ovens assume a fully preheated oven. Use our oven to air fryer converter (usually 20°C lower and about 20% shorter), and do a quick preheat for baked goods.
5 Preheating Mistakes to Avoid
- Preheating with parchment, foil or a paper towel inside. With nothing weighing it down, the fan lifts it into the element. Read our guides on foil in an air fryer and paper towel in an air fryer.
- Spraying oil into a hot, empty basket. Oil on a bare, very hot surface smokes quickly and builds up sticky residue. Oil the food instead.
- Preheating far longer than needed. Ten minutes empty wastes energy and gives no extra benefit. If you see smoke from an empty basket, old grease is burning off; see why is my air fryer smoking.
- Preheating for leftovers. A blast of hot air dries the outside before the middle warms through. Start from cold and use a lower temperature.
- Forgetting the basket is hot. Use tongs or oven gloves when adding food, and set the drawer on a heat-proof surface.
Frequently Asked Questions
Do you need to preheat an air fryer?
Not always. Most air fryers heat up in 2–5 minutes, so food will cook without preheating. A 3-minute preheat does give crispier results for frozen chips, breaded food, steak, pastry and baking. Follow your manual if it gives an instruction.
How long should I preheat my air fryer?
About 3 minutes for most basket air fryers. Compact models need 2–3 minutes, large dual-basket models 3–5 minutes, and air fryer ovens 4–6 minutes.
Do you need to preheat a Ninja air fryer?
Some Ninja manuals recommend preheating for best results. Many Ninja models don’t have a preheat button, so set your temperature and run the empty air fryer for about 3 minutes before adding food.
Do you need to preheat a Philips air fryer?
No. Philips states that its Airfryers don’t need preheating, and you can put the ingredients straight into the basket.
Can I preheat an air fryer with parchment paper in it?
No. Loose parchment, foil or paper towel can be blown into the heating element while the air fryer is empty. Add liners only once food is sitting on top of them.
Should I add extra time if I don’t preheat?
Yes. Add about 2–3 minutes to recipes written for a preheated air fryer, and check doneness with a thermometer or by colour rather than relying on the timer.
More cooking guides: frozen chips times · chicken breast · salmon · air fryer desserts · how air fryers work
