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Air handlers on an air conditioner will freeze if there are low levels of refrigerant (freon) in the system, which can be caused by a slow (or not so slow) leak. A dirty air filter
http://answers.ask.com/Business/Other/what_causes_...
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The main cause of the air conditioner air handler freezing up is low refrigerant (freon) in the system, which is sometimes caused by a slow leak in the system. Refrigerant levels
http://answers.ask.com/Business/Other/why_does_air...
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The most common reasons an air conditioner will freeze up are due to either a dirty filter preventing proper air flow, or the unit is low on refrigerant.
http://answers.ask.com/Business/Other/why_does_my_...
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In most cases, a slow leak in the system causes the air conditioner air handler to freeze up due to low refrigerant (freon) levels in the system. Refrigerant levels should be checked
http://answers.ask.com/Business/Other/why_do_air_c...
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