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Tools

Size your aircon. See what it'll cost to run.

This estimator uses the standard South African base of 600 BTU per square metre, then adjusts for ceiling height, sun exposure, insulation, occupants, appliances and room type. Running cost uses current Eskom and Mbombela municipal tariffs. Site visit still required for the final sizing.

Your room

Running cost

Inclining Block Tariff (IBT): Block 1 (0–50 kWh) ~195 c/kWh, Block 2 (51–100) ~256, Block 3 (101–600) 352, Block 4 (>600) ~404. Block 3 shown because any household running an aircon is already past Blocks 1+2 on baseline load — the marginal aircon kWh is always charged at Block 3 or higher. Next update July 2026 (~9–11% increase expected).

Recommended unit
13,100
BTU
≈ 3.84 kW cooling capacity
One size down
12k BTU
3.52 kW
Recommended
18k BTU
5.28 kW
One size up
24k BTU
7.03 kW

Estimated running cost

Per day
30.72 kWh
Per month
921.6 kWh
Monthly cost
R 3,244.03
Annual cost
R 38,928.38

Assumes the unit runs at rated capacity for the hours entered. Real inverters cycle, so actual consumption is typically 30–50 % lower once the room reaches set-point.

How we got there

  • Base (20 m² × 600)+12,000 BTU
  • Occupants (2)+600 BTU
  • Appliances (1)+500 BTU
  • Total load13,100 BTU