Design before you buy
HVAC design in Al Sahl
HVAC design in Al Sahl accounts for the spread-out mix of residential and commercial buildings across wider spaces. We calculate cooling needs and select the right system before any equipment purchase.
- 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
Request this serviceDuct installation
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Request this serviceDuct fabrication
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Request this serviceAC repair & faults
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Request this serviceAC removal & refitting
Request this serviceDuct cleaning & sanitising
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Request this serviceAHU maintenance
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Request this serviceMosque HVAC
Request this serviceMall & retail HVAC
Request this serviceRestaurant & cafe HVAC
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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 Sahl is an expanding district with villas, apartment blocks and some commercial projects, with larger gaps between buildings and wider streets than older areas. This extra space makes outdoor unit placement easier, but long distances between rooms may need close study of air distribution. Poor design leads to air loss in long ducts and uneven cooling across distances.
Al Sahl lies in south Jeddah, an expanding district of villas and apartment blocks with open spaces between buildings.
Villas and blocks in Al Sahl are spread over wider areas, with outdoor units typically on spacious roofs and longer distances from the indoor unit.
The AC setup in Al Sahl
- 1
Central system for large villas and blocks
Spacious villas and blocks in Al Sahl typically use one central system with extended duct networks distributing air across floors and wings.
- 2
Independent units with limited ducting
Small projects and shops use independent split units or window units without complex ducting.
- 3
Multi-unit systems with centralised control
Some newer buildings in Al Sahl offer unified control across multiple units, enabling better energy efficiency.
Before the visit
Before our visit in Al Sahl
- 1
Obtain complete architectural plans
We need precise plans showing dimensions, walls, windows and doors per floor for accurate heat-load calculation.
- 2
Choose the roof location for the outdoor unit
Ensure ample roof space with clear power and drainage access, and confirm maintenance access.
- 3
Tell us about building use and window exposure
Tell us about south and west-facing exposure, window count and expected occupancy or staff.
More districts for HVAC design
Other services in Al Sahl
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.
My villa is set back from the main road in Al Sahl, does that affect design?
Extra space allows more freedom in placing the outdoor unit, but the long run from the indoor unit needs study to avoid pressure loss in ducts.
My villa has open-plan design with large rooms and high ceilings, how does that affect it?
Open-plan makes air distribution easier, but large spaces and high ceilings increase heat load. We size the unit and ducts based on actual volume.
Al Sahl is newly developed, do new buildings need different design?
New buildings here typically have better insulation and modern glazing, which may lower heat load compared to older buildings. We study materials and insulation during design.
My small commercial project in Al Sahl needs one split or something larger?
It depends on area and use. Small shops and offices typically need one or two split units, but we recommend calculating heat load before purchase.
