Outcome measures: Primary: PaCO2. Secondary: Health related quality of life; lung function; nocturnal transcutaneous carbon dioxide assessment and saturation, and costs Sample size calculation/data analysis: This is a non-inferiority trial based on PaCO2 as primary outcome. A difference in favor of the hospital care group of smaller than 0.5 kPa will be labeled as non-inferior. To retain 72 evaluable patients, and allow for drop-outs, we will include 96 patients in total.