Phono-semantic — one part hints at the meaning, another at the sound
Example phrases
刚出炉的面包让整个厨房变得暖烘烘的。Gāng chūlú de miànbāo ràng zhěng gè chúfáng biàn de nuǎnhōnghōng de.The freshly baked bread made the whole kitchen feel warm and cosy.
冬天坐在炉子旁边,身上暖烘烘的。Dōngtiān zuò zài lúzi pángbiān, shēnshang nuǎnhōnghōng de.Sitting beside the stove in winter, your whole body feels snug and warm.
被子在太阳下晒过以后,盖起来暖烘烘的。Bèizi zài tàiyáng xià shài guò yǐhòu, gài qǐlái nuǎnhōnghōng de.After the quilt has been aired in the sun, it feels warm and cosy to sleep under.