Design before you buy
HVAC design in Al Marsa
Al Marsa in south Jeddah on the coastal waterfront has modern mid-rise apartment buildings with multi-room units and shared corridors. HVAC design here must balance individual units per flat with airtight ductwork in shared walls to prevent leaks or noise transfer.
- Accurate heat loads
- System selection
- Duct drawings
Clients We're Proud to Serve
Organisations and companies that trusted Alrabih with their projects.
Who needs a considered design?
- 1
Owner planning a new build
Before walls and ceilings are finished you still have the chance to route ducts and place units correctly. Early design prevents costly surprises during fit-out and delivers rooms that cool evenly from the first day of operation.
- 2
Architect or contractor needing drawings
The project needs mechanical drawings to co-ordinate with the structure, electrical and plumbing trades. We produce duct layout drawings, equipment positions and installation heights in a format the site can use directly.
- 3
Existing building with uneven cooling
Some rooms stay hot even with the AC running while others are over-cooled. The cause is usually wrong airflow distribution or uncalculated capacity. A redesign finds the fault and defines what needs changing before any new purchase.
Who it's for
Building a villa and want design before fit-out
We calculate the heat load for every room in the villa and draw duct routes before ceilings are closed, so you avoid breaking the finished work later.
Ask on WhatsAppRunning a commercial building with hot rooms
We review the current airflow distribution and recalculate loads per space, then identify faults in the ducts or equipment and draw the required changes before any purchase.
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What the design covers
- Heat load per room
- Right system type selected
- Equipment from authorised brands
- Duct distribution layout drawings
- Equipment schedule for construction
How we work
How we work
- 1
Gather building data
We ask for the architectural drawings or visit the site to measure spaces and record glazing, orientation and internal loads from people, equipment and kitchens.
- 2
Calculate heat loads
We calculate the heat load for each space separately, accounting for Jeddah's intense sun, high humidity and exposed facades, so every unit is sized on real load not guesswork.
- 3
Select system and equipment
Based on loads and building type we choose between splits, ducted systems, central air and chiller, and specify equipment from Carrier, YORK, General, Midea, Gree and Smart Gold to suit the project.
- 4
Draw and deliver
We draw duct routes, unit positions, diffuser locations and installation heights, and deliver a complete equipment schedule ready for construction or tendering.
Calculated design or buying blind?
| Alrabih | The usual way | |
|---|---|---|
| Unit size | Based on actual load | Guessed or oversized |
| Airflow distribution | Drawing that achieves even flow | Diffusers placed at random |
| Co-ordination | Drawings before fit-out | Costly changes later |
| System type | Suited to building and budget | Whatever the shop suggests |
| Humidity and salt air | Accounted for in equipment choice | Discovered after installation |
Everything your AC needs, from one team
From system design and duct fabrication to installation, commissioning and maintenance.
Split AC installation
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Request this serviceDuct cleaning & sanitising
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Some of our work
Ductwork, rooftop units and diffusers, from work we've completed in Jeddah.
Customer reviews
What our customers say
- Muhammadramzan 2641
“MashaaAllah. Services are so good. Behaviour and kindness 100/100. Prices are less then Market. Fully recommended”
- shahzeb armani
“Wow. Prices are so comfortable. Outstanding services. People are so talented and nice”
- Tawfik AlyawerLocal Guide
“U can find all u need for air conditioning”
Your satisfaction matters to us! If you had a great experience with us, we'd love a 5-star rating and a kind review.
Worked with us? Leave a reviewService areas
We come to you anywhere in Jeddah
From Al Shiraa and Al Yaqout in the north to Al Thaghr and Al Quraiyat in the south, with our base in Al Aziziyah.
What sets this district apart
Al Marsa buildings sit near the sea and face high humidity and salt exposure, increasing cooling load in ways that need careful calculation to account for moisture. Mid-rise blocks need efficient duct distribution across multiple storeys, and any miscalculation causes uneven cooling between upper and lower flats or noise and leaks. Proper design accounts for the coastal environment and varying loads across each floor level.
Al Marsa lies in south Jeddah on the coast, a district of modern mid-rise residential buildings with direct exposure to the marine environment.
Most flats here need individual split units per dwelling with ductwork concealed in shared interior walls.
The AC setup in Al Marsa
- 1
Individual split units per flat
Each flat needs its own split unit because of complete separation between residents and different temperature control needs.
- 2
Ducts within shared internal walls
Main ducts run through shared interior walls to preserve space and prevent vapour leakage between units.
- 3
Outdoor units on balcony edges or roof
Outdoor units sit on balcony edges or the shared roof, positioned away from windows and the main entrance.
Before the visit
Before our visit in Al Marsa
- 1
Get a diagram of the flat's layout
Prepare a diagram showing room positions, window locations and balcony doors so we can decide where indoor and outdoor units fit best.
- 2
Confirm balcony or roof access
Ensure the balcony is safe or the shared roof is accessible before the visit, and there is a secure spot for the outdoor unit.
- 3
Notify the building management
Inform the building management that our design team will visit, particularly if we need access to shared areas or the roof.
More districts for HVAC design
Other services in Al Marsa
FAQ
Questions about HVAC design
When is a chiller more suitable than split units?
The decision depends on the building area, number of spaces and how it is used. In large commercial and hotel buildings a chiller gives flexible control and simplifies central maintenance. In apartments and smaller villas a split or ducted system usually fits better. The calculated heat load is what determines the right choice for your building.
How does a large glazed facade affect the design?
Large glazing exposed to Jeddah's sun raises the heat load noticeably, especially on west and north-west facades. We calculate solar gain through each facade separately, and this can change the unit type selected for that room or require extra diffusers to handle the higher load.
Can you design for an existing building with no architectural drawings?
Yes. When no drawings exist we visit the site and measure every space ourselves, recording facades, glazing and how each room is used. The survey takes longer than reviewing ready drawings, but the calculations still rest on real measurements rather than estimates, which is what makes the results reliable.
Does the design include diffuser types and dampers?
The drawings specify diffuser types, positions and sizes to match ceiling height and room shape, and show where dampers are needed to balance airflow to each zone. These details matter because a diffuser in the wrong place wastes a large part of the system capacity even when the units are correctly sized.
Does duct design differ between the ground floor and upper floors?
Yes. The top floor typically carries a higher heat load because the roof is directly exposed to the sun, which affects duct sizes and the number of diffusers needed on that level. We design each floor separately based on its own calculated load and show where dampers are needed to balance airflow between floors.
Coastal humidity affects cooling load here, how do you account for it?
We add a moisture factor to the baseline heat load based on the building's proximity to the sea, so we select units with capacity to handle excess humidity.
Flats on different floors, is cooling even across all levels?
We calculate load per floor separately because window sizes and sun exposure differ, and we balance air velocity so each flat receives even pressure.
Our shared walls are thin, do ducts cause noise between flats?
We install sound insulation around ducts and flexible air dampers to reduce vibration and noise between adjacent flats.
Salt and moisture affect metals, does equipment wear faster?
We select corrosion-resistant materials for ducts and outdoor units, and recommend regular maintenance to prevent salt and moisture buildup on coils.
