uh Honey? That thing outside is frozen again.

So you look out your window one morning and notice your A/C unit is frozen. What do you do? This can be a bad thing, but doesn't have to be. How to tell? 1st off, Heat pump or Straight air? A Heat pump will freeze in the winter often. It will also sense this and defrost itself. Either Heat pump or Straight air freezing in the summer is probably bad. The 1st thing you need to check is your filter. A dirty or clogged filter can cause freezing. On the other hand low pressures due to low freon or a blockage in the line set can also cause freezing. Not to mention a clogged coil. If it's not the filter, call a Professional.

 You might save yourself some money and the service guy some time if you turn the unit off (no heat/no cool) and set the Fan to "on". This will help defrost the inside coil over time. You don't want to pay someone to do it. A rough estimate to defrost a coil is $75-150 depending on the work involved.

In closing, the Filter is probably the most forgotten piece in your HVAC system. It can cause a good bit a frustration as well as dent your pocket. Show your filter some Love.