Choosing AC: split, multi-split, ducted systems and capacity
Floor area is a starting point, not a complete heat-load calculation. Two rooms of the same size can need different solutions.
From 10 to 100 m²: what the number misses
For a 10 or 20 m² room, a 30 m² living room or a 50, 70 or 100 m² home, ceiling height, windows, sunshine, insulation, occupancy and layout matter. Do not add separate rooms together and assume one split will serve them all. Cooling-capacity units describe capacity, not electrical consumption.
Comparing system types
A split serves a zone; a multi-split connects several indoor units to a compatible outdoor unit. Ducted systems require assessment of routes, return air and access panels. Portable units have different exhaust-air requirements. Inverter describes compressor regulation, not air distribution. A heat pump can provide heating and, depending on the system, cooling.
Repairing or replacing older equipment
Compare the diagnosis and repair quotation with the full replacement cost, not just a new unit's purchase price. Overall condition, recurring faults, parts availability and whether existing capacity suits the home all matter. Age alone does not decide. Ask what could be retained from the installation and what work each option would require.
Bedroom, living room or office
In bedrooms, consider where air reaches and noise at the actual operating setting. Layout and solar gains may dominate in a living room. For offices, add occupancy and heat-producing equipment. Compare equivalent acoustic measurements and seasonal performance rather than a generic claim to be the quietest. Ask for the capacity and location choices to be justified.
Choose the next step
Use the symptom page to understand the likely causes. If the cause is still unclear, book a diagnosis before approving a repair.