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中国古人如何保暖的？

Temperature adjustable room daubed with pepper mash
During the Qin (221-206 BC) and Han (206 BC-220) dynasties, temperature adjustable rooms emerged in royal families. Royal court had larger and well-equipped rooms, with fireplaces and "Fire walls" that were attached to the stove. They were basically the rudimentary forms of radiator and kang bed-stove.
秦朝时，在贵族以及皇宫内又出现了“壁炉”和“火墙”等用以取暖。壁炉里主要是用烧炭来御寒，并且将出烟孔放在室外，避免炭烟中毒。另外在秦兴乐宫遗址中还发现了火墙的做法，即用两块筒瓦相扣，做成管道包在墙的内侧，与灶相连通，已经具备了火炕、暖气的雏形。
Imperial palaces such as Changle Palace and Weiyang Palace in Western Han Dynasty (206 BC-AD 24) had temperature adjustable halls. It is said that the "temperature adjustable hall" was built with pepper mash daubed on the wall, embroidery tapestries hung on the wall and a thick carpet paved on the ground. Windshield screens and wild goose feather-made curtains were also used to keep cool air outside.
汉武帝时建立了一座温室殿，位于前殿之北，冬天时供皇帝居住，在殿内设有各种防寒保暖的特殊设备，《西京杂记》记载：“温室殿以花椒和泥涂壁， 壁面披挂锦绣，以香桂为主， 设火齐云母屏风，有鸿羽帐，地上铺着西域毛毯。”未央宫温室殿是公卿朝臣议政的重要殿所。
Back in the days, only the empress’s palace was built with pepper mash on the wall, hence the name “椒房殿”(The palace of pepper houses) . For a long time, only the empress or the most favored concubines could enjoy this special privilege, making 椒房 the symbol of power in the inner palace.
而皇后的宫殿则主要通过花椒和泥涂抹来取暖，被称为“椒房殿”。当然，到后来，“椒房”几乎成了皇后的代称，成为后宫女权的象征。

Ground heating system
During the Ming (1368-1644) and Qing (1644-1912）dynasties, a ground heating system was used indoors, which was built by concreting circular flue underground. The charcoal fire smoke would flow through channels to the whole room and raise the temperature indoors. The ground heating system enabled the room heat up evenly and mildly. As the fiery pit and smoke jack was set outdoors, the heating method was safe, clean and practical.
The ground heating system wasn't invented by Ming and Qing dynasty people. It emerged as early as Wei and Jin dynasties (AD 220-420). The historical record shows that the northeast part of China had used fire pits to keep warm during that time, which functioned similarly as a ground heating system.