Definition of «to warm the air»

The phrase "to warm the air" means to make the temperature of the air higher or more comfortable by increasing its heat.

This system blows warm air from the front headrests to keep your neck warm. (bakermotorcompany.com)
So instead of bringing in cool air after having brought warm air in before, the heat just stays. (sciencedaily.com)
It also may be contained in warm air rising from appliances. (rismedia.com)
(see all sentences)