I bought one of those Iiyama 21 inch jobbies. Warmed my study, it did!
Eventually I caught up with moderm tech and got an LCD monitor. The Iiyama went to elder daughter who still uses it and reckons it's the best monitor she's ever had. The cat sleeps on it cos it's warm. I dread to think what the fur and the lack of ventilation are doing to it, but far be it from me to say...