How do I calculate AC size for a room in Dubai?

The basic calculation uses room area (length × width) multiplied by a cooling load factor based on room type, sun exposure, ceiling height, and number of occupants. For a typical Dubai bedroom (15 m², 2.7m ceiling, medium sun, 2 people), the calculation gives approximately 18,000 BTU or 1.5 ton. Use our calculator above for an accurate recommendation.

What size AC do I need for a Dubai studio apartment?

A typical Dubai studio apartment (30-40 m²) needs a 1.5 ton (18,000 BTU) or 2 ton (24,000 BTU) split AC, depending on sun exposure and ceiling height. Use the calculator above with your specific studio dimensions for an accurate recommendation.

How many BTU do I need per square metre in Dubai?

In Dubai's climate, you need approximately 350-550 BTU per square metre depending on room type: 350 BTU/m² for bedrooms, 450 BTU/m² for living rooms and offices, 550 BTU/m² for kitchens. This is then adjusted for sun exposure, ceiling height, and occupancy.

What happens if my AC is undersized?

An undersized AC will run continuously without reaching the set temperature, consume more electricity than a properly sized unit, and wear out faster from overwork. It will also struggle to dehumidify the air, leaving the room feeling clammy even if the temperature eventually drops.

What happens if my AC is oversized?

An oversized AC cools the room too quickly and shuts off — a process called short cycling. This means the AC does not run long enough to dehumidify the air, leaving the room feeling cold but clammy. Oversized ACs also have higher upfront costs and shorter compressor life from frequent starts.

How accurate is this AC size calculator?

The calculator provides a close estimate based on ASHRAE cooling load factors. For a precise recommendation, a site visit from our HVAC technician is needed — factors like window size, insulation, number of external walls, and airflow all affect the final sizing. Use this calculator as a starting point, then book a site survey for confirmation.

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AC Size Calculator for Dubai Homes

Find the right AC capacity for your room in seconds. Enter your room dimensions, ceiling height, sun exposure, and occupancy to get the recommended BTU and AC tonnage. Used by 2,000+ Dubai residents.

AC Sizing Inputs

Enter your room details below. The calculator uses ASHRAE cooling load factors.

Room Length (m)

Room Width (m)

Ceiling Height (m)

Number of People

Room Type

Sun Exposure

Your AC recommendation will appear here

Enter your room dimensions and click Calculate BTU to see the recommended AC tonnage, calculation breakdown, and next steps.

Quick Reference

Small bedroom (10-15 m²)1 ton (12,000 BTU)

Master bedroom (15-25 m²)1.5 ton (18,000 BTU)

Living room (25-35 m²)2 ton (24,000 BTU)

Large living room (35-50 m²)2.5 ton (30,000 BTU)

Open-plan area (50-70 m²)3-4 ton (36-48k BTU)

How the Calculator Works

Our calculator uses industry-standard ASHRAE cooling load factors adapted for Dubai's climate.

1. Room Volume

We start with the room's floor area multiplied by ceiling height, then apply a base cooling load per square metre based on room type (bedroom, living room, kitchen).

2. Load Adjustments

We adjust for sun exposure (low, medium, high), additional occupants (600 BTU per person over the first), and ceiling height above the standard 2.7 metres.

3. AC Recommendation

We match the total cooling load to the closest standard AC size (12,000 BTU = 1 ton), recommending the next size up to ensure adequate cooling capacity.

Important: This calculator provides an estimate based on typical Dubai residential conditions. For commercial properties, rooms with extensive glazing, or unusual layouts, a site visit from our HVAC technician is recommended. We offer free site surveys for AC replacement and new installation projects.

AC Sizing Questions

Common questions about this service. Don't see yours? WhatsApp us — we reply fast.

Need Help Choosing the Right AC?

Our HVAC technicians offer free site surveys for AC replacement and new installation. WhatsApp or call us today.

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