It Winter, and many have their heat on. But if you live in a apartment, your getting heat from a boiler. And it must be ready. The boiler is what gives you heat that comes into your apartment from the baseboard, or radiator.
The boiler is different that your home furnace. It provides radiant heat. Their systems are also more complex than our home furnace's.
They can have issues like noisy pipes, inconsistent heat, and also leaks.
One thing for sure, only a professional can work on these.