Subject + 很 + 暖和
The adjective 暖和 (nuǎnhuo) means "warm" and describes a pleasant, comfortable warmth. It is more colloquial and cozy-sounding than the more neutral 温暖. For example, 床很暖和 means "the bed is warm."
今天太阳出来了,外面很暖和。
Jīntiān tàiyáng chūlái le, wàimiàn hěn nuǎnhuo.
The sun came out today, and it's very warm outside.
穿上这件大衣,马上就暖和多了。
Chuān shàng zhè jiàn dàyī, mǎshàng jiù nuǎnhuo duō le.
Put on this coat and you'll feel much warmer right away.
屋子里开着暖气,又暖和又舒服。
Wūzi lǐ kāizhe nuǎnqì, yòu nuǎnhuo yòu shūfu.
The heater is on in the room — it's warm and comfortable.