Your AC is on.
The fan is blowing.
But your house still feels warm.
In the Florida Keys, this is one of the most common service calls we receive — especially during peak summer in Key Largo, Tavernier, Islamorada, and Marathon.
If your AC is running but not cooling properly, here are the most likely causes in a coastal climate.
This is the simplest — and most overlooked — issue.
A dirty filter restricts airflow, which:
In high-humidity areas, filters can clog faster than expected.
Check your filter first.
If refrigerant levels are low due to a leak, your system cannot absorb heat effectively.
Signs may include:
Refrigerant issues require professional repair.
High humidity + restricted airflow can cause coils to freeze.
When this happens:
Turning the system off temporarily may allow it to thaw — but the root cause must be addressed.
Coastal exposure accelerates wear on outdoor condenser coils.
If coils are corroded or clogged:
Waterfront and canal-front homes are especially vulnerable.
If your AC turns on and off frequently without completing full cycles, it may:
Short cycling prevents proper humidity removal — leaving your home feeling warm and damp.
If ducts pull hot attic air into the system, your AC constantly fights against incoming heat.
This is common in older Keys homes or properties that have undergone renovations.
Signs include:
If your system is 10+ years old in the Florida Keys, declining performance may signal age-related wear.
Coastal systems often have shorter lifespans due to:
If breakdowns are becoming frequent, repair vs. replacement may need evaluation.
Before calling for service:
If the issue continues, professional diagnosis prevents further damage — especially during peak heat.
In extreme humidity, a struggling AC system doesn’t just affect comfort.
It can quickly lead to:
The longer the issue continues, the more stress your system endures.
If your AC is running but not cooling, it’s not something to ignore — especially in a coastal climate.
Island Air Control evaluates:
We diagnose the actual cause — not just the symptom — so your home stays cool even on the hottest, stickiest days on the rock.
Trust Island Air Control to keep your system running steady when it counts.
