A client compares brands, capacities and prices of units. They rarely compare installers — yet that is where what they will actually get is decided. An air conditioner is a system, not an object: it works well only if its installation made it capable of working.
Selling a unit or installing a system
That distinction structures the whole trade.
A unit sold in a shop is a product. Installed air conditioning is an assembly: an indoor unit, an outdoor unit, a line between the two, an electrical supply, a condensate drain, and supports able to carry it all. Any one of those can compromise the whole.
That is why a serious installer does not simply execute an order. They ask where the unit will go, why, in which room, with what exposure — and check that what is asked for is feasible before accepting.
Sizing before proposing
The client's first instinct is to think in capacity: "give me a big one, then I'll be fine". That is exactly the mistake.
Capacity is determined from the room's volume, its exposure, its glazed area, its insulation and the expected use. An oversized unit reaches its setpoint too quickly, stops, restarts, begins again — and that succession of short cycles wears it faster while treating the air less well. An undersized unit runs constantly without ever holding the setpoint.
That calculation is done at the quotation stage, on site, and it is part of the work. An installer who proposes a capacity over the phone, without having seen the room, is proposing at random. The exact parameters, calculation methods and values depend on the units, the building and local conditions: they are determined case by case and do not transfer from one home to another.
The installation decides the lifespan
This is the heart of the trade, and the part the client cannot judge — hence the importance of explaining it.
Several things depend on it directly. The line between the two units must be run properly: excessive length, multiple bends or a poor route degrade performance lastingly. The condensate drain must run away correctly, failing which water ends up coming out indoors — the most frequent and most avoidable fault. The supports must carry the load in a wall that allows it; where the substrate is doubtful, the question belongs to someone able to say what the wall can take.
Then comes commissioning, which is done in a precise order and with the equipment the manufacturer specifies, by a trained technician. An article does not describe that procedure: it says that it exists, that it takes time, and that an installer who skips it sells a cheaper installation and a shorter-lived unit.
Refrigerant: strictly for trained technicians
This is where the boundary must be sharpest, for the client and for this article.
A refrigeration circuit contains a fluid under pressure. Handling it, recovering it, charging it and any reintroduction belong to trained and equipped personnel, according to the rules applicable in the country. No indication of procedure, pressure, quantity or refrigerant type belongs here: these are data specific to each unit, carried in its documentation.
Nor are these fluids environmentally neutral. The Kigali Amendment to the Montreal Protocol, adopted in 2016 under the auspices of the United Nations Environment Programme, organises the phase-down of the production and consumption of hydrofluorocarbons — high global-warming-potential gases widely used in refrigeration and air conditioning — on schedules differentiated between countries. That has two concrete consequences for an installer: the fluids in use are changing, and how they are handled — without release, with recovery — becomes a professional competence rather than a detail.
The building sector itself is concerned: the United Nations Environment Programme, through its Global Alliance for Buildings and Construction, highlights the weight of that sector in global energy use and emissions. A correctly sized, installed and serviced unit consumes less — a technical argument as much as a commercial one.
Servicing, and why its frequency is not copied
A fouled air conditioner consumes more, cools less and wears faster. Servicing is therefore not a comfort service: it is what protects the investment.
Depending on the unit, it includes cleaning filters and heat exchangers, checking that condensate drains away, checking operation, and examining supports and fixings. The useful frequency, however, does not transfer from one place to another: it depends on the environment — dust, proximity to a road, vegetation —, on use, on the type of unit and on the manufacturer's recommendations. A serious service contract therefore sets a frequency that has been discussed, not one from a catalogue.
Fault finding: look before you recharge
A unit that cools poorly does not necessarily need recharging.
A refrigeration circuit is sealed: if the charge has dropped, there is a leak. Recharging without looking amounts to filling a punctured container — the client pays, the unit works for a few weeks, then the problem returns, and the refrigerant has gone into the atmosphere. Leak detection therefore precedes recharging, and a professional who says so does not lose a client: they save them paying twice.
Other faults have nothing to do with refrigerant — supply, controls, fan, an electrical component. That too is why diagnosis precedes the quotation, as elsewhere in the building trades.
What the installer does not decide alone
Two neighbouring areas come up constantly and are not theirs.
The electrical supply: an air conditioner is a power appliance. Its connection, its protection and the installation's capacity to take it belong to a qualified electrician. An installer who connects to whatever is handy because it is simpler creates a risk that has nothing to do with cooling.
The support and the building fabric: where fixing an outdoor unit requires anchoring in a doubtful wall, or where a penetration passes through an element of uncertain nature, the question belongs to a qualified professional according to the locally applicable framework.
The site's own safety principles — work at height, suitable means of access, competent personnel — follow the same logic as in the other building trades.
In the African context
Conditions vary sharply between countries, cities and types of building: there is no single African air conditioning market, and two districts of the same city can pose different problems.
The first reality is dust and environment. Depending on the area and season, filters and heat exchangers foul markedly faster than elsewhere, which shifts the trade's centre of gravity towards recurring servicing rather than installation alone. That is a direct commercial opportunity: the service contract, more regular and more profitable than a one-off installation, is justified here by technical reasons rather than by a sales argument.
The second is electrical supply. Where outages, voltage variation and abrupt restorations are frequent, units are stressed differently, and the question of electrical protection arises with particular sharpness — without it being the air conditioning installer's place to deal with it.
The third is climate and use. Sustained heat, high humidity depending on the region, contrasting seasons: sizing and servicing are judged there on real conditions, not on imported averages. A unit sized for a temperate climate is not sized for a heavily exposed room in strong heat.
The fourth is supply and the evolution of refrigerants. The phase-down organised by the Kigali Amendment follows schedules differentiated by country, and available units change accordingly. Keeping up with what applies locally — and knowing how to recover rather than release — separates a professional from a fitter.
The fifth is training. Refrigeration is very largely passed on in the course of work, alongside someone more experienced and outside formal schemes — a mode of learning the International Labour Organization has documented in a guide devoted to upgrading it in Africa. The point is not to devalue that route but to structure it: in a trade that handles fluids under pressure and touches electricity, training and equipment make the difference between an installation that lasts and one that condemns the unit. Digital helps unevenly across markets — messaging serves to receive a photograph of the room and the intended location, mobile payment to settle recurring servicing, and a simple service record per unit beats software nobody keeps up. The International Telecommunication Union puts the share of the world's population using the Internet at 74 per cent in 2025, with 36 per cent for Africa, the lowest of the regions it measures.
What an installer does not promise
They do not guarantee the life of a unit they did not supply, nor the operation of equipment installed by someone else, nor a stated consumption, nor a result on an electrical installation they have not seen, nor the absence of faults. They stand in neither for a qualified electrician, nor for a qualified professional on anything structural, nor for the manufacturer on what the manufacturer warrants.
What they do commit to can be checked: a visit before quoting, sizing calculated and explained, installation in line with the manufacturer's recommendations, controlled commissioning, leak detection before any recharge, servicing at a frequency that has been discussed, and an invoice.
That is also what makes the business credible: a stable professional identity, verifiable references, a quotation separating equipment from labour, a service record per unit, and genuine reviews. The record matters more than whatever holds it: a notebook kept up is enough.
Artificial intelligence can help prepare a quotation, organise a servicing schedule, draft a job report or sort enquiries. It does not see the room, does not calculate a capacity from a rough description, diagnoses no leak, and replaces neither the manufacturer's documentation nor the rules applicable to refrigerant in the country.