亜熱帯[anettai] subtropics
悪熱[onetsu] fever following a chill
稲熱[imochi] rice blight
稲熱病[imochibyou] rice blight
炎熱[ennetsu] sweltering heat

温熱[onnetsu] hot fever
温熱性[onnetsusei] thermal
下熱[genetsu] lowering fever
加熱[kanetsu] heating
火熱[kanetsu] heat (from a flame)

熾す[okosu] to light a fire
熾烈[shiretsu] fierce
熾火[okibi] glowing ember (either red hot charcoal or the glowing remains of burnt firewood)

熾きる[okiru] to be kindled (fire)
熾熱[shinetsu] intense heat