There are many reasons why it does not work: it may have lost all its refrigerant because of a leak in the system; its compressor pump may have stopped working; etc...
If you cannot see anything obviously "set wrong" on the controls of the ac unit, the best advice anyone should give you is to call a licensed Heating, Ventilation and Air Conditioning (HVAC) technician to advise you and/or fix it for you. For personal safety reasons only technicians who are licensed to work on HVAC (Heating, Ventilation and Air Conditioning) should do this kind of work because they have the right test equipment and tools and have been trained in how to do this work safely.
The outdoor portion of the central ac unit is what gives up the heat from indoors, so it has to be outside. For a more thorough explanation see the question: How does air conditioning work.
you might need freon in the air condition.
in central ac we use chiller to cool the water which is circulated throughout the building . by blowing air over the cooled water tubes the air got cooled. in night time inplace of cold water FM chiller , hot water is circulated which make the air hot.
Yes, the heat pump (in the heating mode) is like an air conditioner in reverse. It cools the outside air and heats the room air. Of course, you need Freon to do this heat-transfer process.
The "dense" central portion of an atom is called the nucleus. The nucleus of an atom contains neutrons and protons.
Have you checked the breaker outside by the unit
needs oil..
needs to be leveled..
The problem is probably outside. Can`t tell you much more than that from here. The condenser unit outside was not running. I checked the circuit breaker box and found the 220 breaker had been switched off. Turned it back on and now it's running and I'm getting cool air.
The outdoor portion of the central ac unit is what gives up the heat from indoors, so it has to be outside. For a more thorough explanation see the question: How does air conditioning work.
If your circuit breakers are in the garage, they would be in a electrical panel (a metal box mounted on a (usually) outside wall, with the electric meter on the outside. The circuit breakers can be either just below the meter on the outside on opposite it inside the garage. It would usually be very close to where the electric connection to the house is. The electrical panel and breakers are not necessarily in the garage.
No, but it's a good idea to protect any metal equipment from extreme weather.
keep it closed the windows .but if need fresh air from outside , open the windows.
What about them?
yes you can
Central air conditioning systems are designed to provide ventilation by bringing in outside air. Leaving a window open would tend to defeat the cooling effect.
When air is cooled the water in it comes out (like mist forming on the outside of a class filled with cold coke) and this happens in the air conditioner. Normally the dripping water is drained way to the outside (or a drain) by a pipe. If the pipe gets blocked the water will overflow and the conditioner will leak water - get it serviced.