Most UK tenancies will not let you drill for a split outdoor unit. That does not mean you have to melt through a heatwave — portable compressor units with a temporary window kit are the usual renter path.
What is usually fine
- Freestanding portable AC on castors
- Exhaust hose through an open window with a fabric/plastic seal kit
- Removing the kit and storing the unit when you move out
What often needs written permission
- Permanent wall vents or core-drilled holes
- Outdoor condensers or bracket work
- Electrical work beyond a standard plug socket
Always check your tenancy agreement. If unsure, email the agent a one-line ask: “portable AC with removable window kit, no drilling.”
Window types in UK rentals
Sash windows, casement windows, and patio doors all need slightly different kits. Measure the opening before you buy. A poor seal wastes electricity and can whistle at night.
Deposit-safe habits
- Use the manufacturer window kit; avoid tape that peels paint
- Empty condensate as directed so nothing stains flooring
- Keep the original box for moving day
Next step
Browse renter-friendly portable picks or take the quiz. Every Amazon link on this site uses affiliate tag view0b0c-22.