Design before you buy
HVAC design in Al Mulaisa
In Al Mulaisa, south Jeddah, designing your HVAC system before buying equipment means correctly sized units and even cooling throughout. Alrabih calculates the heat load for each space based on its area, glazing, occupants and sun exposure, then draws the layouts before you purchase anything.
- 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 Mulaisa is a relatively modern residential area dominated by large villas and palaces with spacious layouts, open roofs and extensive glazing. This building type demands precise heat load calculations because direct sun bears heavily on south and east facades, and large spaces need balanced cooling distribution across multiple rooms. Pre-design ensures you pick the right system type, whether multi-split or central ducted, with air routes precisely calculated.
Al Mulaisa lies in Jeddah's southern sector, a modern villa district with large openings and roofs heavily exposed to sun.
Most Al Mulaisa villas need either a central system or multi-split units because of the large floor areas and separate rooms.
The AC setup in Al Mulaisa
- 1
Central system with distributed ducts
The spacious villas in Al Mulaisa benefit from ducts running from one or two central units, distributing cool air evenly to all rooms.
- 2
Multi-split for zoned temperature control
Some villas prefer several separate split units in different zones for finer temperature control based on how each area is used.
- 3
Outdoor units mounted on elevated roofs
The open, elevated roofs in Al Mulaisa give outdoor units good airflow, which improves their efficiency in hot weather.
Before the visit
Before our visit in Al Mulaisa
- 1
Provide drawings or photos of the villa
Send us architectural drawings or photos of the facades, windows and main rooms before the visit so we can calculate the heat load more accurately.
- 2
Specify roof and outdoor unit locations
Tell us where the roof is and any preferred locations for outdoor units, and confirm safe access to those areas before the visit day.
- 3
Gather information on occupancy and usage
Prepare information on how many people live in the villa, which rooms are used most, and when intensive cooling is needed so we can factor that in.
More districts for HVAC design
Other services in Al Mulaisa
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.
How do you calculate heat load for a large, open villa like mine?
We measure the total area and glazing on each facade and the villa's solar orientation, then calculate the load per room based on occupancy, electrical equipment and sun exposure.
Villa roofs here are very exposed, does that change the design?
Yes, the heavy sun exposure on open roofs significantly increases the heat load, so we specify larger-capacity units and central ducts that distribute air evenly across all rooms.
The large windows in the villa let in a lot of heat; how does your design address that?
We factor the window-to-floor ratio and window orientation into our unit selection and calculate the best locations for ducts and indoor vents to offset the extra heat gain.
Does designing first save money on electricity bills later?
Correct design means the unit never oversizes or wastes cooling on unused spaces, which cuts power consumption and extends equipment life.
