Indianapolis HVAC FAQ: What’s the Best Way to Thaw a Frozen Coil?

By: Brian Schutt  |  April 26, 2015

When a coil freezes take these important steps to thaw it correctly 

4 Steps to Thaw a Frozen Evaporator Coil

1) Turn thermostat Cool setting to OFF.

2) Leave or set the thermostat Fan setting to ON.

3) Place old towel near system to ensure water does not go to unwanted areas.

4) Monitor progress, then call HVAC contractor when coil has thawed.


thaw frozen air conditioner coil

Why do evaporator coils freeze?

As air conditioners age, one of the symptoms we see across Indianapolis is a coil freezing. Many times this is related to low refrigerant levels caused by a leak in the system.

HVAC technicians are very limited in diagnosing and repairing the air conditioner so long as the coil remains frozen, so we recommend home owners allow the coil to thaw.

Because the coil is essentially a large block of ice, when it thaws it will produce a lot of water. The risks of that water thawing and adversely impacting the electrical components of your system are significant.

We recommend following the steps above when thawing the coil.

Brian Schutt


is the co-owner of Homesense Heating | Cooling. Born and raised in Indianapolis, he loves the city and its people, and is committed to bringing a servants mindset into the heating and cooling industry. One of the ways he does that is to translate the technical language of HVAC into the manageable and understandable for homeowners.

Have a question? Tweet him and you'll get an answer promptly.

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