Comparison
AC vs Ceiling Fan
Primary question · Is a fan enough, or do I really need AC?
A ceiling fan can make a 28°C room feel like 25°C; for the cost of running a lightbulb. Air conditioning makes 32°C feel like 22°C, for ten times the energy. The right answer is sometimes both.
House Summary
Fans first if you're under ~28°C average peak. AC if you're regularly in the 30°Cs or sleep is being disrupted. Many UK homes need a fan downstairs and a split in the bedroom.
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