What size AC is needed? A simple guide in tons
AC tons by room size for UAE heat: 1 ton up to about 11 m², 1.5 ton for a standard bedroom, 2 ton for a living room, and when to go one size up.
For a standard UAE bedroom of about 11–17 m², a 1.5 ton AC (18,000 BTU/h) is the usual size. Sizing tables used by manufacturers in the UAE work out to roughly 1,000 BTU/h per m² of floor area, far more than in milder climates, because summer temperatures regularly pass 45°C. On top of that, a room with strong afternoon sun or a hot roof above needs one step more.
ACs in the UAE are sold by tons: 1 ton equals 12,000 BTU/h. The label also lists the cooling capacity in BTU/h or kW, and that figure is the one to compare between brands.
Quick reference
| Room area | Suggested size | Capacity | Typical room |
|---|---|---|---|
| Up to about 11 m² | 1 ton | 12,000 BTU/h | Small bedroom, study, maid's room |
| 11–17 m² | 1.5 ton | 18,000 BTU/h | Standard bedroom |
| 17–20 m² | 1.5–2 ton | 18,000–24,000 BTU/h | Master bedroom |
| 19–23 m² | 2 ton | 24,000 BTU/h | Living or dining room |
| 23–33 m² | 2.5 ton | 30,000 BTU/h | Open-plan living area, majlis |
Above about 33 m², two units at opposite ends of the room, or a ducted system, usually cool more evenly than one large wall unit. When a room falls near the top of a range, the larger size is the safer choice.
How to work out the size
- Measure the room. Length × width in metres: a 3.5 m × 4.5 m bedroom is about 16 m².
- Find the row in the table. 16 m² falls in the 11–17 m² row: 1.5 ton.
- Check the conditions below. If any apply, go one step up. The same room on a top floor with a west-facing window becomes 2 ton.
- Read the label. Compare the BTU/h or kW on the specification sheet, not only the tons printed on the box.
Only the space the AC has to cool counts, but an open kitchen or corridor without a door is part of that space. The AC size calculator runs these steps with the adjustments for sun, floor, people and kitchen; for UAE summers the result is best read together with the table above, and the installer should confirm the size on site.
Go one size up when
- Strong afternoon sun. West-facing walls and large glass windows heat up from noon to sunset, exactly when cooling is needed most. A common rule of thumb is to add about 0.5 ton.
- Top floor or under the roof. A roof in summer heats the ceiling below it. A room that would take 1.5 ton lower down often needs 2 ton at the top.
- High ceiling. Sizing tables assume a ceiling of about 2.8 m. Double-height living rooms and mezzanines in villas need more.
- Several people. A family room or majlis that is often full runs warmer.
- Open kitchen. Cooking adds heat, so an open-plan living area with a kitchen needs the larger size.
Why not just buy bigger?
A larger unit costs more to buy and install, and it does not always feel better. An oversized non-inverter unit reaches the set temperature fast and switches off before it has removed the moisture. In humid coastal weeks that leaves the room cold but clammy, and constant on-off cycling wears the compressor.
An undersized unit runs at full power all afternoon, never reaches the set temperature, and pushes up the electricity bill. Inverter units slow down instead of switching off, so they cope better with a slightly larger size and use less power once the room is cool. With DEWA tariffs of 23–38 fils per kWh plus a fuel surcharge and 5% VAT, the AC electricity cost calculator helps compare running costs before buying.
Split, ducted or window?
- Wall-mounted split: quiet indoors, inverter models widely available, needs an outdoor unit with space around it. The usual choice for single rooms.
- Ducted or concealed: hidden above a false ceiling, cools several rooms or a large space through grilles. Common in villas and newer apartments; needs access panels for service.
- Window: lower purchase and installation cost, louder, needs a wall opening. Many towers and communities do not allow new window units.
Apartments on district cooling usually have fan coil units supplied by the building, and adding a private split unit may not be allowed. Building rules are worth checking before buying.
What it costs
Published retail prices for wall-mounted split units in the UAE are about AED 1,200–1,800 for 1 ton, AED 1,800–2,500 for 1.5 ton and AED 2,500–3,200 for 2 ton, depending on brand and inverter technology. Installation labour is often charged at about AED 150 for the call-out and first hour, then about AED 150 per hour, with copper pipe, brackets and electrical work on top. A larger unit may need a dedicated circuit, which is work for an electrician.
A good installer confirms the size after seeing the room. The page for AC installation explains what is included, and one request on khalasna brings up to 5 quotes from installers in the area, for example in Sharjah.
Frequently asked questions
What size AC is needed for a 3 x 4 metre room?
A 3 x 4 m room is 12 m², which falls in the 1.5 ton range (18,000 BTU/h) for UAE conditions. A shaded room on a lower floor may manage with 1 ton; a west-facing or top-floor room should not go below 1.5 ton.
Can one AC cool two rooms?
Not well with a wall-mounted unit. Cold air does not travel reliably through doors and corridors, so the far room stays warm. Separate units, a multi-split system or a ducted unit with grilles in each room work better.
How many BTU is 1 ton?
1 ton of cooling equals 12,000 BTU/h, or about 3.5 kW. A 1.5 ton unit is 18,000 BTU/h and a 2 ton unit 24,000 BTU/h.
Is 2 ton too big for a bedroom?
For a shaded bedroom under 17 m², usually yes, especially with a non-inverter unit that cycles on and off and leaves the room humid. It makes sense for a large master bedroom, a top-floor room or a room with strong afternoon sun.
Is an inverter AC worth it in the UAE?
Usually yes, because the AC runs many hours a day for most of the year. Inverter units cost more to buy but slow down instead of switching on and off, which lowers running costs once the room is cool.