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AC Freezing Up
in Tallahassee, FL
When ice forms on your AC lines or indoor unit, the system stops moving air and your house heats up fast. This is a common call in Tallahassee from May through August, when units are running around the clock. Left alone, the ice can cause the compressor to fail, which is a much bigger repair than whatever caused the freeze in the first place.
Quick Answer
AC units freeze up in Tallahassee most often because airflow is blocked or the refrigerant is low. When ice coats the coil, no air can get through and the system stops cooling entirely. Turn the unit off and let it thaw, then call (850) 907-7205 to find out why it froze in the first place. Running it while frozen makes the damage worse.
Telltale Signs
Warning Signs to Watch For
- Ice visible on the copper refrigerant lines coming out of the wall or unit
- The AC is running but blowing warm or no air
- Water dripping or pooling around the indoor air handler
- The outdoor unit is running but the house isn't cooling
- A thick layer of frost on the indoor coil visible if you open the air handler panel
Root Causes
What Causes AC Freezing Up?
Restricted Airflow
The coil needs a steady flow of warm indoor air to stay above freezing. When a clogged filter, blocked return vent, or closed supply vent cuts that airflow off, the coil temperature drops below 32 degrees and ice forms. In houses with older ductwork, common in Tallahassee homes built before 1990, collapsed or disconnected duct sections can cause the same thing.
The Fix
Filter Replacement and Duct Inspection
Replace the air filter and check every return and supply vent for blockages. If ductwork is the problem, a technician inspects and seals or replaces the damaged sections so air moves freely.
Low Refrigerant From a Leak
When refrigerant is low, the pressure inside the coil drops too far and the coil gets colder than it should. Moisture in the air then freezes onto it instead of draining away as water. Small refrigerant leaks are common on systems that are 10 or more years old, especially here where the units run hard for 8 to 9 months a year.
The Fix
Leak Repair and Refrigerant Recharge
A technician finds and fixes the leak, then restores the refrigerant to the correct level. Skipping the leak repair means the system will freeze again within weeks.
Dirty Evaporator Coil
A coil coated in dust and debris doesn't absorb heat well, so it stays too cold and frost accumulates on its surface. Tallahassee's high pollen counts from pine trees and summer humidity speed up coil buildup, especially on systems that don't get annual maintenance.
The Fix
Professional Coil Cleaning
A technician cleans the coil so it can transfer heat properly again. Cleaning also reduces the chance of mold growing inside the unit, which is a real issue in the humidity here.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Restricted Airflow | Low Refrigerant From a Leak | Dirty Evaporator Coil |
|---|---|---|---|
| Ice disappears after changing the air filter and the problem doesn't return | |||
| System refreezes within a few days even after thawing completely | |||
| Visible ice on the refrigerant line outside the house near the wall | |||
| Airflow from vents was weak for weeks before the freeze happened | |||
| Musty smell from vents along with freezing problem |
Free Inspection
Get a Diagnosis in Tallahassee
An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
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