What we inspect on site
A proper site assessment for zoned air-conditioning starts with the building itself. We look at ceiling void height, roof space, bulkheads, service routes, and the places where ducting, dampers and controls can be installed without causing future access problems. We also check room use, occupancy, glass area, orientation, kitchen or server heat gain, and whether the property is a home, office or mixed use premises.
In Johannesburg and Pretoria, one building can behave very differently from the next. A west-facing room in Sandton with large glass panels will need a different zoning approach to a north-facing office in Pretoria East, and a double storey house in Randburg may need separate treatment for upstairs bedrooms and downstairs living areas. We record the practical limits up front so there are no surprises later.
- Ceiling depth and access hatches
- Room sizes, use and occupancy
- Window size, orientation and shading
- Existing electrical supply and control points
- Noise-sensitive rooms and return air positions
How the zoning recommendation is put together
We do not guess where the dampers should go. The zoning recommendation is based on the measured layout, the heat load factors, and how the building is actually used through the day. If a boardroom is occupied for short periods, or a bedroom sits empty most of the day, the controls should reflect that. If one area carries a bigger solar load or more people, it needs to be treated differently from the rest.
Our team then maps the likely supply and return paths, checks whether a ducted system can be split into sensible zones, and notes where smart thermostats or wall controllers should be placed. We also look at whether the client needs simple time schedules, room-by-room temperature control, or a more detailed zoning set-up with multiple dampers and sensors.
- Room-by-room damper options
- Thermostat and sensor positions
- Airflow path and pressure control
- Possible noise and draught issues
- Compatibility with later system upgrades
What is included in the assessment
The site visit is not just a quick walk-through. We gather the information needed to design a workable system and to avoid costly changes once installation starts. That includes measurements, photographs where needed, ceiling and roof space notes, access limitations, and a review of where the equipment can be serviced later. If there are special concerns such as coastal humidity, salty air, or repeated dust ingress, we include those in the recommendation too.
We also speak to the owner, tenant, or facilities manager about how the property is used. In offices, that might mean meeting rooms, open plan work areas, and after-hours operation. In homes it often means bedrooms, living rooms, entertainment areas, and quiet periods overnight. The better the brief, the better the zoning outcome, and it helps to avoid overspecifying areas that do not need it.
- Measured room and ceiling information
- Heat load observations
- Access and serviceability notes
- Recommendation summary for zoning approach
- Issues that may affect cost or timing
Assessment process and turnaround
We usually start with a short phone discussion or email exchange to understand the property, the number of rooms, and the rough scope. After that, we arrange a site visit in Johannesburg, Sandton, Randburg, Pretoria, Centurion or Pretoria East. For standard homes and small office spaces, turnaround on the assessment report is usually quick once the site has been visited, often within a few working days depending on the detail required.
If the project is more complex, such as a multi-zone office floor, a full retrofit, or a building with difficult ceiling access, we may need a follow-up visit before finalising the recommendation. That extra time is worth it. A good assessment prevents undersized ducting, poor damper placement and controls that do not suit how people actually work or live.
- Initial enquiry and rough scope
- Site visit and measurements
- Review of ceiling space, access and heat loads
- Assessment summary and zoning recommendation
- Quotation pathway for design and installation
Pricing approach for site assessments
We quote site assessments according to the size of the property, the number of areas to be inspected, and the level of technical detail required. A simple residential visit with a clear layout is priced differently from a larger office with multiple rooms, restricted roof access, or an existing system that must be reviewed for upgrade potential. Where the visit is part of a full design and installation brief, the assessment may form part of the overall project cost.
We keep the pricing approach practical and clear. If the building needs extra measuring, more time on site, or a second visit, we say so before the work goes ahead. That helps clients budget properly and avoid unexpected add-ons later on. For landlords and managing agents, we can also separate the assessment from the installation quote if that is easier for approval.
Because load-shedding and backup power arrangements can affect system choice, we will also flag any power-related limitations during the assessment. That is especially useful where a property already has inverter support, generator supply, or partial backup circuits.
Recommended maintenance intervals after the assessment
Once the zoning approach has been confirmed, the system should be serviced regularly to keep airflow steady and controls accurate. For most homes, an annual service is suitable, while offices and busier properties may need checks every six months. Coastal areas or dusty sites may need shorter intervals, especially where filters, dampers and condensate drainage are working harder than usual.
We look at the maintenance plan during the assessment so the equipment can be accessed later without tearing open ceilings. That includes filter access, damper access, thermostat positions and clear routes for fault finding. A well planned system is easier to keep in good order, and it usually costs less to maintain over time.
- Homes: every 12 months
- Offices and high-use areas: every 6 months
- Coastal or dusty properties: every 4 to 6 months
- After major renovations: recheck the zoning layout
Why a site assessment matters before any installation
A zoning system can only perform as well as the layout allows. If the ceiling space is too shallow, if the duct runs are too long, or if a room has high heat gain from glazing, those facts need to be known at the start. A site assessment gives you the numbers and the practical picture before anyone starts cutting, running cable or fitting dampers.
At Airzone, we work from Johannesburg with Pretoria coverage and handle site assessments for homes and offices across the area. Ian Mokoena and the team use the visit to confirm what is possible, what needs adjustment, and where a simpler approach may be the better one. It is a proper first step, not a box ticking exercise, and it gives the installation team a clean brief to work from.
Key facts
| Service area | Johannesburg, Sandton, Randburg, Pretoria, Centurion and Pretoria East |
|---|---|
| Typical assessment scope | Ceiling access, room use, heat load factors, duct routes, control positions and service access |
| Suitable property types | Homes, offices, mixed use spaces, retrofits and new builds |
| Recommended zoning basis | Room-by-room dampers with smart thermostat control |
| Turnaround | Usually within a few working days after the site visit, depending on project detail |
| Maintenance interval guidance | 12 months for homes, 6 months for offices, shorter intervals for coastal or dusty sites |
