What size heat pump do I need?
Start with a quick room-size estimate, then let AirSmart confirm the right heating system for your home. Have your room measurements ready — it takes less than a minute.
2. Your heating estimate
Enter your room dimensions to see an indicative heating output in kilowatts (kW).
We’ll also show the floor area and room volume used in your calculation.
Indicative heating output
This is a starting point, not a final equipment recommendation or a Healthy Homes compliance result.
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Sizing a rental property?
The Tenancy Services assessment considers the living room’s construction and heat loss in more detail. Use the official tool for a Healthy Homes heating assessment and keep its report.
Open the official Tenancy Services heating tool ↗Know what your result means
How is this estimate calculated?
Room length × width × ceiling height × 55 watts per cubic metre ÷ 1,000 = indicative heating output in kW, rounded to one decimal place. This simple volume method follows the room-sizing factor in the Mitsubishi Electric sizing guide. It is not the Tenancy Services formula. For example, a 6 m × 5 m room with a 2.4 m ceiling gives approximately 4.0 kW.
Why should AirSmart check my room?
Insulation, glazing, draughts, outdoor temperatures, room layout and the heat pump’s performance all affect selection. The estimate does not model these heat losses. Very large spaces, high or sloped ceilings, adjoining open rooms and whole-home systems need a tailored assessment. Heating output is different from electricity consumption and cooling capacity.
What do I need for the official heating assessment?
Prepare the living room’s dimensions and details of walls, windows, floor, ceiling and construction. The official assessment uses more detailed inputs than this quick estimate. Read the Tenancy Services tool guide before starting. AirSmart’s calculator is independent and is not endorsed by Tenancy Services.