HVAC in Newark is a boiler and radiators in a brick building, plus window units fighting a long humid summer. Some houses have a furnace. Some larger buildings share the plant. The cellar may be tight, damp, and not entirely yours. No heat in a cold week is the urgent call, and it may be urgent for more than one flat. A sleepless top floor in August is the other call. Name the machine before you name the misery.
A cold radiator needs context. Is the whole building cold, or only your room? Do pipes bang? Can you see the boiler, or does someone else control it? A window unit that drips into the sash, freezes, or trips the circuit is not central air, and calling it central air will send the conversation the wrong way. Filters and ducts matter only if you have them. Many of these flats do not.
Humidity is the summer fact. Brick holds heat into the evening. People on upper floors feel it first. Old windows make the boiler seem weak in winter when the real loss is the sash. Say whether the complaint is no heat, uneven heat, a leak at the radiator, or cooling that quit. If the boiler sits in a basement that takes water, say that. Fuel-burning equipment in a tight cellar needs a flue that drafts and air to breathe. Mention the chimney if you know it is in bad shape.
For a replacement, say the fuel and whether the building is a house or several flats. A condenser on a small lot has to go somewhere that is not the only path to the rear and not hard against a neighbor's window. Ask who can shut a shared system down. Ask about combustion air and the flue. If you only control the equipment inside your flat, say that in the first sentence so the scope stays honest.
This is not a wide suburban mechanical yard. HVAC in Newark is radiators, a damp cellar, and a window unit in brick. Call the number on this page.