Thermotherapy Against Persistent Bacterial LUNG Infections

Inclusion Criteria: * Age ≥ 18 years * Competent and capable * FEV1\>1,0 L * Have had a positive culture from sputum or BAL min. 2 times in the last 24 months for bacteria of the species: Pseudomonas aeruginosa, Stenotrophomonas maltophilia, Staphylococcus aureus, Haemophilus influenzae, Achromobacter xylosoxidans, Klebsiella oxytoca or Klebsiella pneumoniae. In addition, min. 1 positive culture after treatment with antibiotics * Willing to go to a sauna (min. temperature of 85℃ for at least 7 minutes) four times weekly for six months or avoid going to a sauna for six months Exclusion Criteria: * Allergy to lidocaine and/or midazolam * Contraindications to bronchoscopy * Previous severe laryngospasm (intubation requiring) * Pregnancy/breastfeeding * Severe linguistic problems or inability to give informed consent * Severe mental illness that is not controlled with medication. NB: Patients with controlled mental illness can be included and will be asked on an equal footing as others