Showroom comfort without cooling the whole building
The client was a retail showroom in Rosebank, Johannesburg, with staff areas tucked behind the public-facing floor. Foot traffic changed through the day, meetings came and went, and the back office needed steadier conditions than the showroom. The brief was simple on paper: keep people comfortable, protect stock and finishes, and avoid running one full system for every room when only part of the site was in use.
Rosebank sites often sit in mixed-use buildings where trading hours, landlord rules and shared services all matter. That meant we had to work around access windows, coordinate with other tenants and keep the install neat enough for a front-of-house space. We also had to allow for load-shedding and recovery after power returns, because a cold start on a Monday morning can put pressure on both the equipment and the staff trying to get open on time.
We carried out a site assessment, confirmed the ceiling spaces available above the showroom and measured the office zones separately. The aim was to give each area its own setpoint and schedule, instead of forcing the whole premises to follow one thermostat. That makes a real difference in a place like this, where the public area may need cooling during the day and the back office may only need light conditioning after hours.
Survey, load calculations and equipment layout
Before any installation we completed room-by-room load calculations, checked glazing, ceiling heights, occupancy patterns and the heat coming in from lighting and equipment. We then mapped the duct routes so the main plant could serve both the showroom and the back-office section without noisy runs through occupied areas. The ductwork had to fit within existing ceiling voids, and we kept service access in mind from the start so future maintenance would not mean opening finished areas unnecessarily.
The supply arrangement used zoned ducting with motorised dampers to separate the trading floor from the office side. Each zone got its own smart thermostat and local control schedule, which let the client change temperatures after hours and at weekends without affecting the rest of the site. We also allowed for seasonal changes, because Rosebank can swing from dry winter mornings to hot summer afternoons very quickly.
- Room-by-room dampers for the showroom and office zones
- Smart thermostats with separate schedules for trading hours and back-office use
- Return air arrangement sized to reduce hot spots near the glazing
- Access panels positioned for future servicing and damper checks
- Insulated ducting to limit losses through ceiling voids
Installation around trading hours in Rosebank
The biggest constraint was working around business hours. The client could not afford a noisy site during the day, so we planned most of the disruptive work for early mornings and after close. That meant the installation had to be staged carefully: first the plant and main duct routes, then the zone branches, then controls and balancing once the space was ready. Reece and the installation team coordinated each shift so the showroom could keep trading while the back areas were being fitted out.
Because the site was in Johannesburg, delivery timing and parking also mattered. Materials had to arrive in smaller loads and be taken straight inside, which kept the job tidy and reduced delays. The team worked cleanly around finished surfaces and protected display areas while the ceiling work was underway. We also checked condensate drainage early, since poor falls in a retrofit job can become a problem later when the humidity rises in summer.
- Phased installation to suit the client’s trading timetable
- Quiet periods protected by after-hours work where possible
- Careful delivery and material handling in a busy urban setting
- Drainage and fall checks completed before final close-up
- Co-ordination with other building users to limit disruption
Controls programming and airflow balancing
Once the equipment was in, we programmed the controls so the client could run the showroom and office on different operating hours. The front area now follows visitor demand, while the office zone can stay steady for admin work and support calls. We set the thermostats up with sensible temperature bands and recovery times, which helps avoid constant cycling and gives better comfort on hot afternoons.
After programming, we balanced the airflow across all outlets. This is where zoned systems either work properly or become a nuisance, so we spent the time to get it right. The showroom needed even coverage without blasting customers near the supply points, while the office needed quieter delivery and less temperature swing. We also tested the system after power interruptions to make sure it restarted cleanly. No one wants a Monday where the aircon comes back half a degree off and every room feels different.
Our senior HVAC designer and service team checked the final settings against the actual room use, then made small changes before handover. That gave the client a system they could understand and manage without calling for help every time the schedule changed.
Results for the client and the building
The finished result gave the showroom a more stable feel for customers and gave staff proper control over their own work area. Energy use improved because the system no longer cooled unused rooms for long periods, and the separate schedules reduced the need for manual changes through the day. The client also gained a cleaner service plan, because the plant can now be maintained by zone instead of treating the whole floor as one space.
For a Rosebank site, that means fewer interruptions and better daily running. The showroom can stay comfortable during foot traffic peaks, the office can keep its own settings and the landlord-facing finish stayed neat. We also left the client with a clearer service record, which helps when seasonal servicing or fault finding is needed later.
- Comfort improved in both public and private areas
- Lower wasted running time outside trading hours
- Better control for staff with different room schedules
- Cleaner maintenance access for future servicing
- Reduced temperature complaints near glazed areas
What we would do again on a similar project
We would follow the same approach on another mixed-use showroom in Johannesburg or Pretoria. The key is to start with accurate load calculations, then match the duct layout to actual trading patterns rather than forcing a standard plan onto a space that is used in different ways through the day. That thinking saved time later and kept the system easy to live with.
We would also keep the phasing method. Working around trading hours is not always convenient, but it protects business continuity and avoids rushed workmanship. For this kind of site, it is worth taking the extra time to check access, power recovery, drainage and controls before sign-off. Once those are in place, the rest tends to settle properly.
For businesses in Rosebank, Sandton, Randburg or Pretoria East, a zoned ducted system makes sense when the front of house and back-office needs are different. It is a practical way to keep people comfortable without paying to condition empty rooms all day.
Key facts
| Project type | Showroom with back-office zoned air-conditioning |
|---|---|
| Town | Rosebank, Johannesburg |
| System type | Ducted system with room-by-room dampers |
| Controls | Smart thermostats with separate schedules |
| Timeline | 6 weeks from survey to handover |
| Service scope | Assessment, design, installation, programming, balancing and handover |
