Pick your room type below for an instant estimate — then book a free site survey to lock in an exact quote.
🛌
Bedroom
~12 m²
💻
Home office
~10 m²
🌿
Garden room
~18 m²
🛋
Living room
~20 m²
🍽
Kitchen-diner
~30 m²
🏠
Open-plan space
45 m²+
20 m²
Refine your estimate
Rooms to cool
1 room
Additional rooms
Sun exposure
Shaded
Moderate
Full sun
Ceiling height
Standard
High (2.7m+)
Vaulted
Insulation & glazing
Well insulated
Average
Older / single glazed
Indoor unit location
External wall
Interior wall
Recommended unit size
2.5kW cooling capacity
Suits a single wall-mounted split unit
Calculated need 2.3 kWBase area 20 m²
Indoor unit on an external wall: usually the simplest install — a short pipe run straight out to the outdoor unit.
Rounded up to the nearest standard unit size sold (2.5, 3.5, 5.0, 6.0, 7.1, 8.0, 9.4, 10.0, 12.5, 14.0 kW). This is a guide estimate only — final sizing is confirmed on a free in-person survey, which also checks room shape, occupancy and existing electrics.
Floor area — the bigger the room, the more cooling or heating power (kW) is needed to shift the air.
Sun exposure — south-facing or glass-heavy rooms gain extra heat through the day, so need more capacity.
Ceiling height — higher and vaulted ceilings mean more air volume to condition than a standard 2.4m ceiling.
Insulation & glazing — older properties and single glazing lose or gain heat faster, increasing the load.
Occupancy & equipment — rooms with more people, computers or appliances running generate extra heat a system has to work against.
Indoor unit placement — an indoor unit on an external wall usually means a short, simple pipe run. On an interior wall, pipework needs routing further (e.g. through a loft or duct) to reach an outside space, which can add time and cost.
Number of rooms — cooling several rooms usually calls for a multi-split system with one outdoor unit serving multiple indoor units, rather than several standalone systems. Combined output needed rises roughly in line with the number of rooms.