Positives

• Far-infrared therapy appears most often inside broader sauna, infrared, red-light, or recovery-stack routines, so patients usually talk about warmth, circulation, relaxation, and sleep while device type and heat exposure vary a lot. Reddit.

Negatives

• Heat and light-based therapies can also backfire for some patients, especially when dysautonomia, PEM, light sensitivity, or heat intolerance are part of the symptom picture. Reddit.

Hurdles & Side Effects

• Sunlighten’s far-infrared Solo runs $2,600-$3,200 and the Signature series $3,300-$6,800, while Clearlight cabinets typically land $4,999-$12,000+; one Long COVID case study reported about a 20% drop in fatigue, brain fog and anxiety across 80 users.
• Long COVID patients are commonly advised to start at 10 minutes between 100-120°F, only 2-3 sessions the first week with full rest days in between, and to scale back if any post-exertional malaise shows up in the 24-48 hours after a session.