(Bear with me, I'm a non-native English speaker from a non-English speaking country, so my terms may be a bit off. If anything is unclear, please inform me of this and I'll attempt to clarify.)
I've currently moved into a new house and I have some issues with my heating. My heating system works with water, and at first, I figured it was just there not being enough pressure - as there wasn't - so I decided to raise the bar - if you'll pardon the pun - and it works fine for most of my rooms.
Unfortunately, the bedroom is still cold. I can sense almost no heat coming from it and it makes loud ticking noises from time to time, so I was told to vent the air from the heating system, as likely this would resolve the issue.
Having done some research, however, I run into contradicting information on how to proceed.
1) Is it okay to vent just one room?
2) If not, where do I start? Everything online says 'start at the bottom', but several friends have had repairmen over at their places, claiming the workmen instructed to start at the top of the building in the future.
In a bowl of water, the air goes up, so I guess I can see how that'd work, but their advise obviously clashes with everything I've found online so far.
Could anyone explain this to me?