Charak Samhita
सा कुटी तच्च शयनं तच्चावच्छादनं ज्वरम्। शीतं प्रशमयन्त्याशु धूपाश्चागुरुजा घनाः ॥२६९॥
Sleeping on a bed and covering oneself with clothes in the kuthi sweda (fomentation technique by keeping the patient in a cottage) immediately alleviates sheeta. Similarly, the strong fumigation by aguru also alleviates shīta.
english translation
sA kuTI tacca zayanaM taccAvacchAdanaM jvaram। zItaM prazamayantyAzu dhUpAzcAgurujA ghanAH ॥269॥
hk transliteration by Sanscript