Is his room well ventilated, like a verandah?
In cold weather use Soleus reflective heaters (on chairs at foot and side of bed).
They seem to be safe all night and close to the body.
Another thing that might help is turpentine.
I mean topically, on the skin, above any area or organ of the body that needs it.
Turpentine is a medical solvent (like DMSO) and absorbs quickly through the skin to the affected area of the body. The video says it's the same dosage (one teaspoon per day), but putting it on your skin seems better, easier, and safer than ingestion. I apply liberally all over my body and have never had a problem.
I buy the stuff by the case.
Right from the bottle or put on your thumb to dab on your skin.
If it works just as well through the skin, why take it orally?
Turpentine and Kerosene Remedies Cold and Flu Viruses
There are a variety of ways to use turpentine to treat cold and flu viruses.
Sore Throat - Swab the back of the throat with turpentine. Follow with some honey to mask the taste if desired.
Sinuses - Mix together 5 drops turpentine to 1 tablespoon olive oil. Drop several drops into each nostril to deliver turpentine to the nasal passages to relieve congestion and infection.
Cough - Use the same mixture as for sinuses and massage into the back and/or chest to relieve a cough. 1-3 drops of turpentine can be used on a sugar cube and taken internally instead.
Inhalation - Another old-time remedy for cold viruses is simply to inhale the vapors of turpentine. This delivers the turpentine vapors into the lungs, throat and nasal passages.
100% Pure Gum Spirits of Turpentine (available on Amazon)
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Gum Turpentine A Miracle Health Cure - Jennifer Daniels