Honest Review · July 2026 · 14 Days Tested in London
Coolizi Review 2026: Portable Air Conditioner & Heater – No Installation Needed. Honest UK Test.
14 days tested in a London flat. Thermoelectric Peltier cooling + PTC ceramic heating — not a compressor. No hose, no installation, no landlord permission needed. Real performance, real running costs on UK energy prices.
Thermoelectric (Peltier) technology — cools without water, refrigerant, or exhaust hose. Also heats in winter with 1,500W PTC ceramic heater.
Thermoelectric PeltierCools + Heats~55W – 11p/dayNo installation30-day money back
By James Hartley · Updated 27 July 2026 · 9 min read
Quick Verdict
The Coolizi Coolzy is a portable air conditioner and heater with thermoelectric Peltier technology — not a compressor. It uses PTC ceramic heating for winter. No installation, no hose, no refrigerant. Works best in rooms up to 20–25 m².
Who is it for? UK renters who cannot install a split-unit, home workers, anyone struggling to sleep in the heat, and people tired of sky-high energy bills.
Who is it not for? If you need to cool an entire house or regularly face 35°C+ temperatures, a split-system AC remains the better choice.
Unlike fans or portable ACs without a heating function, the Coolizi has a built-in PTC ceramic heater (1,500W). It cools in summer and heats in winter — genuinely useful for the UK's changeable climate.
Mode / Device
Power
Monthly cost*
Cooling (summer)
45–70W
~£3.50
Heating (winter)
800–1,500W
~£57–86
Standard fan heater
2,000W
~£115
* 8h/day at 24p/kWh (UK Ofgem price cap 2026)
Winter savings: Instead of heating the whole house with central heating, use the Coolizi to heat only the room you are in. You could save considerably on your energy bill.
Coolizi vs Alternatives
Feature
Coolizi
Portable Compressor AC
Split-Unit AC
Fan
Technology
Thermoelectric + PTC
Compressor
Compressor
Air movement only
Energy use
Very low (55W)
900–1,200W
700–1,500W
25–60W
Installation
None
Exhaust hose
Wall-mounted + F-gas
None
OK for rented flats
Yes
Usually yes
Usually no
Yes
Heats in winter
Yes (1,500W)
Rarely
Sometimes
No
Price
From £137.99
£350–£700
£800–£2,500+
£20–£80
Prices & Packages
Limited-time heatwave offer. Prices in GBP. Delivery to UK addresses.
The Coolizi uses thermoelectric Peltier technology — not a compressor. An electric current creates a temperature difference across a semiconductor element. One side gets cold (cooling), the other gets warm. A quiet fan blows the cool air into the room. No water, no refrigerant, no exhaust hose. It also has a PTC ceramic heater (1,500W) for winter. This means no installation, whisper-quiet operation, and dramatically lower electricity use than a compressor AC.
Yes. The Coolizi has a built-in PTC ceramic heating element of 1,500W. It cools in summer and heats in winter — one device for the whole year, perfect for the UK's changeable climate.
At 55W and 24p/kWh, 8 hours a day costs roughly 11p per day — around £3.50 per month. A traditional 1,000W AC would cost around 20× more.
Yes. No permanent changes to the property — no holes, no external unit, no fixings. Under UK tenancy law (standard AST agreements), you do not need landlord permission for plug-in devices.
No. Only available through the official website. Buying direct is the only way to get the genuine product with the 30-day money-back guarantee and full warranty.
On Eco mode it is very quiet — quieter than a laptop fan. Thousands of UK customers confirm it does not disturb sleep. The highest setting is around 52dB.
20–25 m² is the sweet spot. In a bedroom or home office this works very well. For a large open-plan room, consider two units.
Yes — 30-day money-back guarantee when purchased through the official website. Full refund, no fuss.
Beat the Heat & Stay Warm This Winter
One device for the whole year. Cools in summer, heats in winter. 30-day money-back guarantee.
