Start with the local property, not a generic BTU chart
Cape Town is not one uniform cooling market. Older masonry homes in the City Bowl and southern suburbs present different routing challenges from newer estates across the northern growth belt. Atlantic-facing properties may also need corrosion-aware outdoor-unit placement because salt-laden air can shorten equipment life.
Established homes often need careful pipe routing that protects original walls and façades; new developments usually offer cleaner back-to-back split-unit positions but may have estate rules governing visible outdoor equipment.