Open connections
Include connected halls, dining areas and open-plan kitchens if doors will remain open while cooling.
Shared-space cooling
Living-room cooling and air conditioning UK
Living rooms often have more glazing, more occupants and more open connections to halls or kitchens than a bedroom. A nominal floor area can therefore understate the space and heat gains that the cooling system must handle.
Room-specific load
What changes the cooling decision
A room name is not a capacity calculation. Record the conditions that change heat gain, comfort and practical installation.
Glazing
Bay windows, patio doors and south- or west-facing glass can create substantial solar gain.
People
Model the usual number of occupants and the higher load during gatherings rather than using an empty-room assumption.
Entertainment equipment
Large televisions, games consoles, amplifiers and computers release heat into the occupied space.
Measure first. Compare second.
Use one transparent room scenario for every product and cost calculation.
- Draw the cooling boundary
Decide which doors can realistically stay closed and measure every space that will remain connected.
- Record the hottest period
Note when direct sun reaches the room and whether external or internal shading can reduce it before cooling starts.
- Choose an exhaust or outdoor route
For portable equipment, confirm a short permitted hose and sealed window route. For split systems, survey pipework, drainage and outdoor-unit position.
- Compare the common schedule
Calculate a typical evening and weekend scenario using one tariff so that power inputs are compared fairly.
System routes
Choose the route before the model
These are decision paths, not product endorsements. Final suitability depends on the measured room and verified product data.
Portable air conditioner
A flexible single-room route when the cooled boundary is clear and a suitable window kit can be fitted.
Continue →Split or multi-splitConsider when the room is used frequently, connects to other occupied zones or forms part of a multi-room plan.
Continue →Heat protection firstShading and timed ventilation can reduce the load that any mechanical system must meet.
Continue →RUNNING COST
Estimate electricity cost →Use your tariff and intended schedule
Rated watts provide a transparent maximum-input scenario. Cycling depends on heat gain, set point, controls and the selected product.
Room questions
Before you choose
Do I include an open-plan kitchen in the room size?
Yes when it remains open during cooling. Cooking and appliances also add heat, so the result needs a kitchen adjustment rather than only additional floor area.
Is a 9,000 BTU unit enough for a living room?
A capacity cannot be judged from the room label alone. Measure volume and account for glazing, sunlight, connected spaces, occupants and equipment before using a capacity range.
Where should a portable unit stand?
Use a stable position that follows the manufacturer clearances and keeps the exhaust hose short and permitted, without blocking circulation or escape routes.
REVIEWED7 August 2026
Report a correction →Room guidance uses transparent physical factors and avoids pretending that one floor-area rule suits every home.