My breaker keeps flipping also for the unit. What could be the problem

Our problem is there's not much of any way we can help you without knowing what kind of system you have
Is it a split system?
With or without heat pump
A package unit,
A boiler
Gas furnace
Electric furnace
Oil furnace
Sorry,, give us more info and we will try to help you

A wild guess without additional info is the Heating element may be shorted.
An amprobe and/or meter could make short work of this?

Electric furnace

our problem is theres not much of any way we can help you without knowing what kinda system you have
is it a split system?
with or without heat pump
a package unit,
a boiler
gas furnace
electric furnace
oil furnace
sorry,,,,give us more info and we will try to help you

My central heating won't turn off and is blowing cold air... electric furnace

It may be a thermostat problem, a Tech would disconnect the wires at thermostat and determine if it is the thermostat, the control wiring, or a stuck relay/contactor.