Heating Ventilating and Air Conditioning

What should you do to unfreeze a central ac unit?


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2005-09-16 13:28:17
2005-09-16 13:28:17

You simply turn the heat/cool selector lever to the off position and turn the fan switch to on. This will thaw out the indoor and outdoor coils. You are low on refrigerant, have a dirty filter, or the fan is not working properly. You should have this system checked.


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New central ac units come precharged from the factory.

Portable AC units, window AC units and central air all has their pros and cons. But to compare a portable ac unit to central air is comparing apples to oranges. Similar in the fact they deliver cool air but ac unit does a complete home whereas a portable ac unit only cools a single room. The price therefore must be based on how many portable ac units it would take to cool a whole house.

One way to tell if you're low on coolant on a central AC unit is to feel the air coming out of the vents. If the air is warm or room temperature, it is a sign that you are low on coolant.

If the drain line from the ac unit is tied into the sink drain line, the trap leaving the ac unit has probably run dry. Fill the trap at the ac unit with a cup of water and it should stop the noise. Assuming a proper install, kinda hard guessing about it from here without seeing it.

The condenssor is outside of the house, the blower unit is somewhere in the house,and call the whole system, "central air".

There should be only one blower to move the air. The unit will have a coil for cooling and a heat exchanger.

Turn off the unit and let them unfreeze then turn the unit back on and see if the pipes freeze up again if so you need to contact an AC repair there's something wrong with the unit. If its constanly running this is one cause of it freezing up. Turn up the thermostat so it doesn't run as much this should help

I'm assuming you have central air conditioning (ac) and not a window unit? If you have an AC unit that is described as a "heat pump" then yes. The heat-pump is designed to heat your home in colder weather. The AC - heat-pum unit should be able to heat your home down to about 20* Fahrenheit. After the heat pump loses it's efficiency, you would manually select emergency heat on your thermostat, this is a good way to determine if you have a heat-pump unit as well .

Water will condense in the inside unit of the air conditioner. This is because the coils in the unit get cold (ad expected) and moisture in the air condenses on them like moisture on a cold glass. There should be a drain inside the unit to drain this water. Check that it isn't clogged.

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.

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