sounds like t stat is programmed wrong, reversing valve coil is bad or reversing valve is stuck.
because it is broken
The fan is not working.
There could be a number of problems. Dirty ducts or heat exchanger. Wrong speed on the fan, or turning the wrong way. Plugged filters or vents.
To heat something means to bring the temperature up and to cool something means to bring temperature down. Hence the terms "Heat Up" and "Cool down". We actually do not need to add the up or down, as heat in itself means to rise, and cool means to lower. So instead of saying "I need to heat my food up", one could just say, " I need to heat my food".
needs heater core replaced wost likely be hind the glove box
No the out side fan is for venting heat away fromt he unit.
Central HVAC provides central air conditioning, central heating, and central ventilation packaged in one unit. As such it will heat, ventilate and cool your home.
Try the thermostat, it may have accidentally been reset to a low temperature. Or the furnace (boiler) that supplies the heat may not be working. Or someone may have turned a valve to cut of the supply of heat to that part of the system. Withou tknowing whether you live in an apartment or your own house that's the best that I can suggest.
warm air, the heat is what is being taken out of the inside of the house.
heat and a/c barley blowing in back?
Car not blowing air or heat
Good insulation in the attic and walls. Central air.