"Instead of preheating outside air from minus 20 degrees to 60 or 70 degrees for inside, you essentially are taking the heat from the ground, which is already at 55 degrees," Martin explained.

Source: https://www.dailyherald.com/news/20230220/breaking-new-ground-how-willowbrook-wildlife-center-will-cut-energy-use

Slower preheating isn’t a dealbreaker if you’re going to cook recipes can take longer to cook.

Source: https://www.digitaltrends.com/dtdeals/best-air-fryer-deals/

The touch screen controls were “a doddle to operate”, and our tester appreciated the “progress bar to monitor preheating, with clear on-screen instructions when it’s time to add or remove food, for the perfect results”.

Source: https://www.independent.co.uk/extras/indybest/boxing-day-sales/boxing-day-sales-deals-b2469498.html

Tsarnas suggests preheating it on high (450°F-500°F).

Source: https://www.forbes.com/sites/nomanazish/2023/03/28/how-to-cook-the-perfect-steak-according-to-experts/