Portable Air Conditioners in Ireland: What to Know Before You Buy
A portable air conditioning unit costs €300–€700 in Ireland, plugs into a normal socket, and vents heat out a window through a hose. In a heatwave it can pull a bedroom from 28°C down to a sleepable 21–23°C — which is why they sell out in every hot spell. But the window-hose design has real limits, and roughly a third of what's sold as “portable air conditioning” (evaporative coolers, misting fans, most tower fans) doesn't actually cool air at all.
This guide covers what a decent unit costs, how to size one for your room, what running it costs, and the point at which an installed split system becomes the smarter spend.
Last updated September 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Quick Answer
A portable air conditioner costs €300–€700 in Ireland. Buy a true refrigerant unit (it will have a window exhaust hose and a BTU rating) — 7,000–9,000 BTU cools a bedroom, 10,000–12,000 BTU a living room. Expect 50–65 dB of noise and €0.35–€0.45 an hour in electricity. Units without a hose are evaporative coolers, not air conditioners, and do very little in humid Irish heat. If you need more than one room cooled or year-round use, an installed split system (€3,000–€5,000) cools far better, runs quietly, and also heats in winter.
Portable air conditioning unit prices in Ireland
Irish retailers (Harvey Norman, Currys, DID, Woodie's, Screwfix, and the supermarkets in a heatwave) stock three tiers:
| Tier | Price | What You Get |
|---|---|---|
| Budget (5,000–7,000 BTU) | €250–€400 | Cools a small bedroom slowly; loud; basic controls |
| Mid-range (8,000–10,000 BTU) | €400–€600 | The sweet spot — handles a double bedroom or small living room; timer, sleep mode, dehumidify |
| Large (11,000–14,000 BTU) | €550–€800 | Open-plan spaces; heavier (30–35 kg); some models add a heating mode |
Established brands in the Irish market include DeLonghi (Pinguino), Argo, EcoAir, Princess, and Black+Decker. Price tracks the BTU rating and noise engineering more than the brand name — and outside heatwave weeks the same units are often €100+ cheaper.
Watch for “air cooler” products in the same aisle at €60–€150: if it has no exhaust hose and no BTU rating, it's an evaporative cooler, not an air conditioner — see below.
What size portable air conditioner do you need?
Cooling power is rated in BTU (British Thermal Units). Undersize it and the unit runs flat out without ever reaching temperature; oversize and you've paid for capacity you don't need. For typical Irish room sizes:
| Room | Typical Size | BTU Needed |
|---|---|---|
| Single bedroom / home office | up to 12 m² | 5,000–7,000 |
| Double bedroom | 12–18 m² | 7,000–9,000 |
| Living room | 18–25 m² | 9,000–12,000 |
| Open-plan kitchen/living | 25–35 m² | 12,000–14,000 |
Add ~1,000 BTU for south-facing rooms with big glazing, attic rooms, or rooms that hold heat — which in practice means most rooms in a modern A-rated home. Why those homes run hot in the first place is covered in our main air conditioning guide.
The window hose problem (and the no-hose myth)
Every true portable air conditioner must dump heat outside through its exhaust hose — and that's the design's weakness. The hose needs a window open a crack, warm outdoor air leaks back in around it, and single-hose units (almost everything sold in Ireland) create negative pressure that pulls more warm air in from the rest of the house. The practical result: a portable unit delivers maybe 60–70% of its rated cooling to the room. A window seal kit (€15–€30) closes the gap around the hose and is the single best upgrade you can make — buy one with the unit.
As for “portable air conditioners without a hose”: there is no such thing. Hoseless devices are evaporative coolers — they blow air over water, which works in dry climates and does very little in humid Irish summer air. Worse, they add moisture to the room, making a muggy 26°C night feel muggier. If it has no hose and no BTU rating, it will not cool your room.
Using a portable air conditioner in a bedroom
The bedroom is what most Irish buyers actually want cooled, and the catch is noise: portable units run at 50–65 dB — between a quiet conversation and a vacuum cleaner — in the room with you. The workaround that suits Irish heatwaves well: run the unit hard for the hour before bed with the door closed, then switch to sleep or low-fan mode overnight. Pre-cooling a well-insulated bedroom holds the temperature for hours. Check the spec sheet for the sleep-mode dB figure (good units drop to ~44–50 dB), not the marketing headline figure.
Also worth knowing: every portable AC doubles as a dehumidifier, which helps sticky Irish nights even at modest cooling settings — drier air at 24°C feels better than humid air at 22°C.
What does a portable air conditioner cost to run?
A mid-range unit draws 1–1.2 kW, so at typical Irish electricity rates it costs €0.35–€0.45 an hour at full cooling. An evening plus overnight sleep-mode run works out around €2–€3 a night, and even using it every night of a three-week hot spell adds roughly €40–€65 to a bill. Homes with solar panels can run daytime cooling essentially free — a hot cloudless afternoon is peak solar output, several times what the unit draws.
When an installed split system beats a portable unit
A portable unit is the right call for one room, a rented home, or a few bad weeks a year. The maths flips when any of these are true: you want more than one room cooled, the heat problem repeats every summer, or your heating bills are high anyway. An installed split system costs €3,000–€5,000 but cools several times better, runs at 19–30 dB, and is an air to air heat pump — it heats all winter at a third the running cost of electric heating, and can qualify for an SEAI grant of up to €7,500 when it replaces your main heating.
Put another way: three summers of buying and running portable units for two rooms costs €1,000–€1,600 for weak cooling — roughly a third of a split system that would have solved both cooling and heating. The full comparison is in our air conditioning Ireland guide.
Portable Air Conditioner FAQ
How much is a portable air conditioner in Ireland?
€300–€700 for a true refrigerant unit in 2026: budget 5,000–7,000 BTU units from €250–€400, the mid-range 8,000–10,000 BTU sweet spot at €400–€600, and large 11,000+ BTU units €550–€800. Prices spike in heatwaves and drop outside summer.
Do portable air conditioners actually work?
Yes — a properly sized refrigerant unit will pull a bedroom from 28°C to 21–23°C. But the window hose leaks heat back in, so expect 60–70% of rated performance, use a window seal kit, and don't expect one unit to cool more than the room it's in.
Is there a portable air conditioner without a hose?
No. Anything without an exhaust hose is an evaporative cooler, not an air conditioner — it blows air over water, which barely works in humid Irish conditions and adds moisture to the room. A real air conditioner must dump heat outside through a hose.
What size portable air conditioner do I need?
5,000–7,000 BTU for a single bedroom or office, 7,000–9,000 BTU for a double bedroom, 9,000–12,000 BTU for a living room, and 12,000–14,000 BTU for open-plan spaces. Add ~1,000 BTU for south-facing, attic, or well-insulated rooms that trap heat.
How much electricity does a portable air conditioner use?
1–1.2 kW at full cooling, which costs €0.35–€0.45 an hour at typical Irish rates. A nightly evening-plus-sleep-mode routine costs €2–€3, and a full three-week hot spell adds roughly €40–€65 to a bill.
Are portable air conditioners noisy?
They run at 50–65 dB in the room — the main complaint for bedroom use. Pre-cool the room hard before bed, then switch to sleep mode (good units drop to 44–50 dB). Wall-mounted split systems run at 19–30 dB indoors by comparison.
Should I buy a portable unit or install air conditioning?
Portable for one room, renters, or occasional heatwaves. Installed split system (€3,000–€5,000) if you want multiple rooms, quiet operation, or year-round value — it also heats in winter as an air to air heat pump and can qualify for an SEAI grant of up to €7,500 when replacing your main heating.
Thinking bigger than one room?
Installed split systems: prices, the SEAI grant angle, and running costs — including why solar makes summer cooling free.
Related Guides
Air Conditioning
AC unit prices in Ireland, installation costs, and the air to air heat pump grant angle.
Heat Pumps
Air source & ground source heat pumps: costs, SEAI grants up to €12,500.
Solar Panel Costs
Full cost breakdown and payback periods.
Home Energy Grants Guide
All SEAI home energy grants: eligibility, amounts, and step-by-step application.
Last updated: September 2026
John Rooney is the editor of Solar Info and has been covering the Irish solar energy market since 2023. He fact-checks all content against official SEAI data and maintains relationships with SEAI-registered installers across Ireland.