Air conditioning vs fans: which actually keeps you cool?
An honest, no-spin comparison of fans, portable units and installed air conditioning.
Fans vs air conditioning
A fan only moves air — it doesn’t lower the temperature or remove humidity. Installed air conditioning actively cools and dehumidifies, runs efficiently (≈10–30p/hr), is very quiet, and heats in winter too. Fans are cheapest; for real comfort in a heatwave, fixed air conditioning wins comfortably.
| Fan | Portable AC | Installed AC ★ | |
|---|---|---|---|
| Typical upfront cost | £20–£150 | £250–£600 | £1,500–£3,000 / room |
| Actually cools the air | No | Limited | Yes |
| Cooling power | Moves air only | Modest, one room | Powerful, sized to the room |
| Running cost | Very low | High (inefficient) | Low (inverter ~10–30p/hr) |
| Dehumidifies | No | Limited | Yes |
| Heats in winter too | No | No | Yes |
| Noise | Low–medium | High (compressor indoors) | Very quiet (≈20 dB) |
| Clutter / window hose | Portable | Hose out a window | Discreet, fitted |
| Lifespan | 2–5 years | 3–5 years | 10–15+ years |
| Adds home appeal | No | No | Yes |
Indicative UK figures, 2026. Installed-AC running cost assumes a modern inverter system.
A fan moves hot air around the room. Air conditioning removes the heat from it — that's the difference you feel on a 30°C night.
So, is air conditioning worth it?
If you only need a gentle breeze on a handful of warm evenings, a fan is fine. But UK summers are getting hotter and homes — especially modern, airtight or south-facing ones — increasingly overheat. A fixed air conditioning system genuinely lowers the temperature, removes humidity, runs quietly and efficiently, and lasts well over a decade.
The clincher is that an air conditioner is also an air-to-air heat pump: the same unit heats your room efficiently in winter, so it works all year instead of sitting idle. Spread over its lifespan — and with finance to ease the upfront cost — it’s far better value than it first appears.
Frequently asked questions
Is air conditioning better than a fan?
Is a portable air conditioner as good as a fixed one?
Is air conditioning worth it in the UK?
Does air conditioning use a lot of electricity?
Ready for a cooler home or office?
Book a free, no-obligation survey and fixed quote with Guildford’s air conditioning specialists.