Installation · ONEHUB AIR CONDITIONING
What size air conditioning do I need for my room?
Room floor area is a starting point, not a complete sizing calculation. The right cooling or heating capacity also depends on glazing, sunlight, ceiling height, insulation, people and equipment. OneHub’s estimator recommends an initial capacity which must be checked before installation.
Does kW mean how much electricity the AC uses?
The capacity shown in a product name usually describes its cooling or heating output. A 3.5 kW cooling system does not necessarily draw 3.5 kW of electricity. Electrical input varies with load, operating conditions and efficiency.
Capacity is also different from airflow or the physical width of the indoor unit. The equipment’s technical data should be checked for the intended operating conditions. A decorative product range is not automatically the right choice if it cannot meet the room load.
What information is needed to size the system?
| Room detail | Why we ask |
|---|---|
| Floor area and ceiling height | These help describe the space and its volume. |
| Windows, roof glazing and orientation | Sunlight and glazing can materially change the cooling demand. |
| Insulation and building construction | Heat entering or leaving the room affects the required output. |
| People and heat-producing equipment | An office or salon may have a different load from a bedroom of the same size. |
| Room layout and intended use | Open doors, adjoining spaces and where air can circulate affect the design. |
Why not simply choose a bigger unit?
Oversizing is not a substitute for design. Depending on the equipment and load, an oversized unit can struggle to modulate effectively, while poor positioning may create draughts or uneven temperatures. An undersized system may run hard without achieving the desired conditions.
The selected system must also suit the available electrical supply, outdoor location, pipe limits, sound requirements and service access. These checks are especially important for unusual rooms, large glazed spaces and commercial premises.
How does the OneHub estimator make its recommendation?
The initial online recommendation uses the floor-area answer and the published equipment options. Customers do not need to select a technical kW size themselves. Unknown or larger spaces may require assessment rather than an automatic online price.
The recommendation remains provisional. Tell us about substantial glazing, high ceilings, strong afternoon sun or unusual equipment loads in the enquiry notes and optional photos. Multi-room and concealed systems need a more detailed design.
Common questions
Can one wall unit cool several closed rooms?
Do not assume it can. Air needs a suitable path to each area; separate rooms may need multiple indoor units or a designed ducted solution.
Will the quoted capacity be confirmed?
Yes. The initial online recommendation is subject to confirmation of the room and installation requirements.
Plan the right system for your space.
Speak to OneHub about your home or business in Dartford, Kent, London or the wider South East by arrangement.