JOHANNESBURG AIR CONDITIONERS · ROOM PLANNER

Find your room’s cooling fit.

Measure your space. Account for the heat. Compare a sensible starting point in kW and BTU/h, then build a room-by-room enquiry for our team.

Designed for preliminary planning of ordinary Gauteng homes and small offices. An installer must confirm heat load, airflow, ventilation, model capacity and electrical requirements.

1. Tell us about the room

Room name Length (m) Width (m) Ceiling height (m) People usually present Room use Insulation Summer sun reaching roomConsider actual summer sun and external shade, particularly afternoon sun. Window / glass coverageLarge glazing is a review flag, not a measured solar calculation. Additional equipment heat while in use (W)Add computers and other equipment’s actual operating heat load. A nameplate maximum may overstate it. Exclude cooking appliances already covered by the kitchen allowance.

2. UNDERSTAND YOUR ESTIMATE

Your starting point appears here.

Enter the room details, then calculate. We’ll show the estimated heat load, a sensitivity range and nearby unit ratings.

3. Explore running costs

Use the chosen model’s rated electrical input in cooling mode. Cooling capacity in kW is a different measurement. We do not invent a tariff or promise an inverter saving.

Enter a model input rating and tariff to see costs.

4. Build your room plan

Add separately enclosed rooms individually. A sum of room loads does not determine a multi-split outdoor unit or ducted system selection.

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Your plan stays in this open tab. Nothing is sent automatically.

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Opening the draft uses your email app. Review it and send it there. This is not a booking or price quotation.

A useful estimate. Clear assumptions.

How the cooling calculation works

Base load = floor area × 0.1 kW/m². Ceiling adjustment = actual height ÷ 2.4 m. We then apply the selected room factors and add 0.18 kW for each occupant beyond two, plus your additional equipment heat in watts ÷ 1,000.

The 0.1 kW/m² baseline, ceiling scaling and occupant allowance follow Daikin South Africa’s introductory sizing guide. Our editable scenario choices use these planning multipliers: insulation good 0.90, typical 1.00, poor 1.25, unknown 1.15; sunlight shaded 0.90, mixed 1.00, strong 1.15; ordinary glazing 1.00, large glazing 1.10; domestic kitchen 1.20, other room uses 1.00. These are broad planning assumptions, not measured building coefficients or a validated engineering heat-load model.

Multipliers compound. Glazing and sun can overlap, so highly glazed rooms need a site assessment. The displayed ±15% sensitivity band is illustrative, not a confidence interval and not a guarantee that the true load lies within it. BTU/h = kW × 3,412.14. Cooling-mode estimates do not establish winter heating requirements.

How to compare unit sizes without oversizing

We show the nearest common nominal capacities below and above the estimate, rather than declaring a guaranteed match. Actual model output varies with indoor and outdoor conditions. Ask our team to review rated output, minimum inverter capacity, airflow, noise and installation constraints. Bigger is not automatically better.

When this calculator needs specialist help

Server rooms, commercial kitchens, workshops, medical spaces, large retail areas, unusual glazing, high occupancy, persistent open doors, ducted systems and industrial processes need a detailed assessment. This tool does not calculate ventilation, moisture loads, building orientation, wall construction, air leakage or high-temperature derating. No socket, circuit, breaker or cable recommendation is made from BTU size.

How the cost scenario works

kWh/month = rated electrical input (kW) × hours/day × days/month × scenario percentage ÷ 100. Cost = kWh × your R/kWh tariff. Actual consumption changes with weather, set point, cycling, inverter modulation and maintenance. Standby use, fixed charges, stepped tariffs and installation costs are excluded. A 100% rated-input calculation is a reference scenario, not a guaranteed maximum.

Reference: Daikin South Africa sizing guide. Need help measuring? Call 011 462 4665 or request a quote.