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How long does it take to cool a room? Square meters explained
Real cooling times by m², BTU, insulation and Medellín humidity — detailed why it varies.
Actualizado: August 2026 · Todas las guías
There is no single magic number. Cooling time depends on heat load (sun, people, equipment), insulation, airflow and capacity (BTU/h). In Medellín, high humidity makes heat feel heavier even when outdoor temperatures are moderate.
Typical ranges (closed room, correctly sized unit)
- 9–12 m² bedroom: 10–20 minutes for a 3–5 °C perceived drop
- 15–25 m² studio / small office: 15–30 minutes
- 30–45 m² living / shop: 25–45 minutes; longer with sun-facing glass
- Open or poorly insulated spaces may never stabilize without zoning
Why it sometimes “doesn’t cool”
- Undersized unit (too few BTU for real m²)
- Dirty filters or blocked coil (low airflow)
- Refrigerant leak or wrong charge
- Open doors/windows or hot air infiltration
- Outdoor unit without airflow or in full sun