1. Dirty or Clogged Air Filters
A blocked filter restricts airflow, forcing your AC to work harder while cooling less effectively. This is the most common — and easiest to fix — cause of weak cooling.
Fix: Clean or replace filters every 2–4 weeks during peak summer use, especially in coastal areas with more dust and salt in the air.
2. Low Refrigerant (Gas Leak)
If your unit blows air but it's not cold, low refrigerant is a likely culprit. This usually means there's a leak somewhere in the system.
Fix: This requires a professional technician to locate the leak, repair it, and recharge the refrigerant properly — never attempt this yourself.
3. Dirty Condenser Coils
Chalets near the coast are especially prone to salt and sand buildup on outdoor condenser units, reducing their ability to release heat.
Fix: Schedule a coil cleaning at least once per season, particularly before summer peak months.
4. Electrical Issues or Faulty Capacitor
If the unit isn't turning on at all, or shuts off unexpectedly, a faulty capacitor or wiring issue may be the cause — especially in units left unused during long chalet absences over winter.
Fix: Have a technician inspect the electrical components before the season starts, not after a breakdown.
5. Undersized Unit for the Space
Sometimes the AC simply isn't powerful enough for the room size, especially in chalets with added extensions or open layouts.
Fix: A professional can recommend the right BTU capacity for your actual space.