Choose how your window opens to see the likely sealing method and the checks to make before buying a portable air conditioner.
Use this matrix to identify the likely route, then check the exact appliance hose, adaptor and window measurements. It does not certify a third-party kit for a product.
| Opening | Likely route | Check before buying |
|---|---|---|
| Sash | Adjustable panel in the open sash or a made-to-measure removable panel | Measure the clear opening; preserve locks, restrictors and escape use |
| Horizontal sliding | Adjustable slider panel sized to the open track | Confirm panel length, hose adaptor diameter and rain exposure |
| Inward-opening casement | Model-compatible framed panel or a fabric seal that permits the hinge movement | A generic rigid slider rarely matches the opening geometry |
| Outward-opening casement | Fabric or removable panel seal around the open leaf | Keep hinges, handle, security and weather loading usable |
| Tilt and turn | Purpose-made fabric or framed seal for the selected opening mode | Do not force the sash, defeat restrictors or trap the hose |
| French or glazed door | Tall removable panel or manufacturer-approved fabric seal | The route must not block the normal escape path or create an insecure opening |
| Roof / Velux | Purpose-made roof-window seal only where the manual and opening allow it | Rain, hose support, fall risk and escape duties make this a higher-caution route |
| Fixed glazing | No removable opening route; a competent approved alteration may be required | Do not cut glass, frames or walls without permission and competent design |
A compressor-based portable air conditioner removes room heat and sends that heat outside through an exhaust hose. An open gap around the hose can let warm air return, reduce security and admit rain. The checker identifies a likely removable sealing approach for common UK openings; the appliance manual and the actual frame still control what is safe.
A vertical sash, side-hinged casement, sliding panel, tilt-and-turn window and roof window need different seals. Measure the usable opening rather than the whole frame, then check whether handles, restrictors or fire-escape duties prevent the proposed arrangement.
Use the hose diameter, maximum length, bend limits and clearance stated by the manufacturer. An improvised longer hose or tight bend increases resistance and can impair performance. Never discharge into a loft, wall cavity, closed corridor or another occupied room.
A removable fabric or panel seal may suit a renter only when it does not damage the frame and the landlord permits it. Ground-floor and accessible windows need a security plan. Fixed cutting, glazing changes or external fittings may need written consent and competent work.
This checker cannot inspect the frame, guarantee compatibility with a particular kit or approve a building alteration. Stop if the arrangement obstructs an escape window, makes the home insecure or conflicts with the product manual.
Method last reviewed 28 August 2026.No. Supplied parts vary by exact model and may suit only particular sliding or hinged openings. Check the product record, manual and box contents rather than assuming a universal kit is included.
A compressor portable air conditioner must reject heat outside through its designed exhaust route. Discharging the hose into the same room moves the rejected heat back indoors.
Only when the exact manufacturer instructions permit that length, diameter and route. Unsupported extensions and tight bends can restrict discharge and reduce useful cooling.
That depends on the frame, seal and property. A fabric seal does not automatically restore a window's normal security, weather resistance or escape function, so assess those separately.
Manufacturer references: AEG portable AC setup and De’Longhi exhaust-hose guidance. Product manuals remain the controlling source for exact fit.