The right heat-pump size depends on more than floor area. Room dimensions are the starting point, but ceiling height, insulation, glazing, sun, layout, use and Canterbury winter conditions can all change the required capacity.
Start with room dimensions
Measure the length, width and ceiling height of the space you want to heat or cool. Note whether it is one enclosed room, an open-plan area or several connected spaces. A system selected for one room may not distribute comfort evenly through hallways or closed doors.
Check the factors that change heat loss and heat gain
- Insulation: ceiling, wall and floor insulation affect how quickly the room loses heat.
- Windows and glazing: window area, frame type, glazing and curtains affect heat transfer.
- Sun and orientation: afternoon sun and large exposed windows can increase summer cooling demand.
- Ceiling height: a taller room contains more air than its floor area suggests.
- Use and occupancy: bedrooms, offices, kitchens and open living areas have different patterns.
- Local climate: outdoor temperatures affect heat-pump capacity and performance.
Use a room-size tool as a starting point
The free Airmax Heat-Pump Fit Check combines dimensions with several building factors to suggest a preliminary category. It does not produce a binding quote or engineering calculation.
Compare the published Samsung range
Airmax lists Samsung WindFree high-wall models from 2.5 kW to 6.8 kW. The current preliminary comparison bands are AR09 for 9–24 m², AR12 for 25–33 m², AR18 for 34–47 m² and AR24 for 48–65 m². View the Airmax shop comparison and open the individual product page for current price, published features and delivery details.
Why final sizing needs the property details
A unit that is too small may struggle in demanding conditions. A larger unit is not automatically better: placement, air distribution, control and cycling also matter. EECA recommends that a supplier assess the space, windows and local climate before giving property-specific advice.
What to send Airmax for an installation estimate
Send the suburb, room dimensions, ceiling height, room use, safe photos and any known access constraints. Airmax supplies and installs heat pumps for residential, commercial and tiny-home projects across the approved Canterbury service area, with wider work assessed by scope.
Review heat-pump installation and service areas or use the contact page to discuss the next step.
Sources: EECA guidance on choosing a right-sized heater and good-practice heat-pump installation. Airmax room bands remain preliminary and require confirmation for the actual property.
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