Air Fryers

Yes, in most real-world cooking sessions. An air fryer's smaller chamber heats up in minutes rather than the 10-15-plus minutes a full oven needs to preheat, and typical air fryer wattage of 1,500-1,750W runs for a shorter total cook time than an oven at a similar temperature. The energy savings shrink for large batches that need multiple air-fryer rounds versus one oven tray.

Yes, both are generally fine as long as they don't block airflow -- weigh the foil or paper down with food so it doesn't get sucked into the heating element, and avoid covering the entire basket floor, since air fryers cook by circulating hot air underneath and around the food, not just from above.

For most foods, no -- one of the main time advantages over an oven is skipping preheat entirely. A short 2-3 minute preheat can help foods that benefit from an initial sear, like frozen fries or wings, reach a crisp exterior faster, but manufacturers generally don't require it.

Air fryers cook via a single fan circulating hot air, so food closer to the fan or piled on top of other pieces gets more direct airflow. Shaking or flipping partway through -- most models include a reminder for this -- redistributes food into that higher-airflow zone and meaningfully improves evenness; it's not just a gimmick.

Ceramic coatings marketed as "PFAS-free" avoid the perfluorinated compounds used in traditional Teflon (PTFE) non-stick, which is the main safety concern people raise. Ceramic coatings tend to be more scratch-resistant to metal utensils early on but can lose non-stick performance with heavy use faster than PTFE in some independent tests -- neither is dangerous when used and cleaned as directed.

Most non-stick basket coatings noticeably degrade after 1-3 years of regular use, especially with metal utensils or abrasive scrubbing -- the motor and heating element itself often outlasts the coating. Using silicone-tipped tongs and non-abrasive sponges extends coating life significantly.