In NY it strongly depends on the building. Big buildings typically have central heating, small ones often have individual boilers.
In any case, a law mandating the minimum a person can sell is economically equivalent to a law mandating the minimum a person can buy. If I'd rather have more money but wear sweaters (at one point in my life this was my preference), I'm not allowed to make that choice.
Do you realize how stingy landlords are allowed to be with the heat? The actual (nighttime) rule is:
* Between the hours of 10:00 PM and 6:00 AM, if the temperature outside falls below 40 degrees, the inside temperature is required to be at least 55 degrees Fahrenheit.
55 degrees! Do you honestly want an apartment which is 45, 40, 35 degrees at night? Hell, it's probably not even sane to keep an apartment under 55 degrees in the winter, for fear of the pipes freezing.
In any case, a law mandating the minimum a person can sell is economically equivalent to a law mandating the minimum a person can buy. If I'd rather have more money but wear sweaters (at one point in my life this was my preference), I'm not allowed to make that choice.