Start with the room, not the price tag
The right system starts with the space it must cool or heat. A bedroom in Randburg with one window and good curtain cover is very different from a glass office in Sandton, or a sunny upstairs room in Midrand. If the unit is undersized, it will run flat out and still struggle. If it is oversized, it may cool too fast without removing enough humidity, which leaves the room clammy.
When you ask for sizing help, we look at the room first. That includes floor area, ceiling height, how many people use the space, and whether the room faces direct afternoon sun. We also consider the way the room is used. A meeting room, server room, salon or open-plan lounge all need different treatment.
- Room length and width in metres
- Ceiling height
- Number of windows and doors
- Sun exposure and shading
- How many people use the space each day
What we need from you before we recommend a unit
You do not need to measure every corner perfectly. A rough size and a few facts are enough for us to guide you. If you are unsure, send what you have and we will work it out with you. Thabo Mokoena and the team have been helping Johannesburg customers since 2004, so we know the common problem spots, from hot top-floor flats to offices with poor ventilation.
Please include as much of the following as you can, even if its only approximate:
- Area in square metres or room dimensions
- Home, office, shop or light industrial use
- Number of windows and whether they are shaded
- Insulation condition, roof type and ceiling type
- Power supply details, including single phase or three phase if known
- Any load-shedding backup, inverter or solar setup already in place
If you are replacing an existing unit, send the current model size or a photo of the indoor and outdoor units. That helps us check whether the old system was suitable or whether it was working too hard.
Choosing between split, inverter, solar and heat pump options
Different systems suit different buildings. A standard split system is often a practical choice for a single room or small office. An inverter aircon is usually better where people want steady temperatures and lower power draw over time. Solar-assisted options can help where daytime usage is high and the building already has solar power. Heat pumps are used for water heating and pool heating, and sizing there matters just as much as with air-conditioning.
We check the actual use pattern before we recommend anything. A family bedroom, a boardroom, a retail floor and a medical room all need different output levels. We also look at whether the unit must cope with load-shedding, frequent door opening or equipment heat. In many Johannesburg buildings, the answer is not simply bigger or smaller, its more about matching the system to the real demand.
- Split systems for single rooms and smaller spaces
- Inverter units for regular daily use and better power control
- Solar aircons for properties with reliable daytime solar supply
- Heat pumps for hot water or pool heating needs
Common sizing mistakes we help you avoid
One of the biggest mistakes is judging by room size alone. Two rooms of the same metreage can need very different systems if one has a big west-facing window and the other stays shaded all day. Another mistake is copying the size from a neighbour or from an old unit without checking whether the original installation was suitable. We see that often in Sandton and the East Rand, especially where offices change layout over time.
We also help customers avoid overspending on a system that is too large for the room. Bigger does not always mean better. It can short cycle, waste energy and wear components faster. On the other hand, a unit that is too small may never catch up in peak summer heat, particularly in top-floor rooms or buildings with poor roof insulation.
If you are not sure, we would rather check the space properly and give you a practical option than sell you something that only looks right on paper.
How our supply and fit process works
Once we have your room details, we recommend the most suitable system and explain the next step clearly. For many Gauteng properties, we can arrange supply and fit, including installation, pipe runs, electrical checks and commissioning. Pieter van Rensburg oversees installations, while Ayesha Patel keeps the schedule moving and arranges follow-up service where needed.
For offices, we can also organise a commercial site survey if the space has multiple rooms or larger cooling loads. That is useful where several units must work together, or where municipal, electrical or building access rules need to be checked before work starts.
- We confirm room size and usage
- We check power and installation conditions
- We recommend a suitable unit size and type
- We arrange installation or replacement where required
- We can add service and maintenance plans after fitment
When to ask for a site visit
Sometimes a message or phone call is enough. In other cases a site visit saves time and avoids mistakes. We recommend one if the building has high ceilings, glass fronting, limited outdoor space, long pipe runs or an older electrical board. The same applies if you are dealing with a heat pump installation, a water generator setup, or a commercial space with several occupied rooms.
Our base is in Johannesburg North and we work across Sandton, Randburg, Midrand, the East Rand and the West Rand. That means we understand local property types, from sectional title homes to busy office parks. If you need a practical answer, we can help you size the system properly the first time.
