Why is my A/C unit icing up?

Why is my A/C unit icing up?  I have frost on the coil and copper tubing. Why am I getting such little airflow from my registers?

There are several things that can cause frost on your coil and/or reduced airflow. Anything that restricts the airflow through the inside unit will cause frost. As the frost builds up on the coil, the airflow becomes more and more restricted, making the condition worse. When the frost is also on the outside pipes next to the compressor, damage to the compressor can occur.

Look for the following:

1. 1. Extremely dirty air filter restricting the airflow through the inside unit.
   2. Extremely dirty (clogged) cooling coil, located directly above furnace, inside the ductwork, restricting airflow through inside unit. Should be cleaned by a professional.
   3. Check your return grill to make sure that is not being obstructed.
   4. System may be low on refrigerant, causing coil to freeze up. Should be seen by a professional.
   5. Blower motor may overheat and “kick off” safety switch. Should be checked by a professional.

Tip: Dirt is the biggest enemy of your air conditioner! Using a good air filter will extend the life of your air conditioner because all the important parts will stay cleaner, operate more efficiently and last longer. An electrostatic filter is excellent – and as a side benefit, you’ll enjoy much healthier indoor air, free from dust mites, mold, mildew, dust, pet dander, etc