But the popular traditional Chinese medicine Lianhua Qingwen, used for symptoms like fever and cough, and antigen test kits remained harder to find.
Online pharmacies across China have run out of drugs and test kits, prompting the government to crack down on hoarding.
Heat was insufficient because of "unstable" coal supplies caused by COVID, state-run Baoding Daily reported, without giving details.
"I have no fear" of COVID, said Yang, a farmer who is fully vaccinated and with no underlying diseases.
China has reported no deaths since easing the COVID curbs, with fatalities to date around 5,200, versus more than 1 million in the United States.