Concealed ceiling air conditioning hides the indoor fan coil in a loft or ceiling void and supplies air through ducts and grilles. Daikin concealed AC searches mean this format, not an invisible system with no outdoor unit. You need depth, a return path, insulation, a drain and a hatch large enough to service the coil. As a planning illustration, builders' work usually pushes cost above a comparable wall split. Choose concealed during a renovation when you refuse wall heads. Do not choose it after the plasterboard is painted.
Concealed is ducted, not magic
The indoor is still a refrigerant fan coil. Filters clog. Drains block. If the hatch is a tiny paint-matched square, the next engineer will cut your ceiling.
Daikin concealed split AC is one maker's ducted indoor. Mitsubishi and others make the same format. Compare void depth and external static pressure, not the word concealed.
- Draw supply and return on plan.
- Insulate ducts in hot lofts.
- Size hatches for coil removal, not for a screwdriver.
- Ask how bedrooms work with doors shut.
Versus cassette and wall
Cassettes need a grid or bulkhead and show a grille in the room. Walls show a head. Concealed shows only grilles if the design is honest. Each has a maintenance story.
Read the ducted UK and ducted versus wall guides with this page.
Cost and programme
Joiners, decorators and extra design time sit on the invoice. If the ceiling is already open, the extra pain falls. If it is not, you are paying to open it.
London period floors with shallow joists can kill the idea. Survey before you promise a partner there will be no indoor units on walls.
Specify during the build sequence
Pipe, drain and electrical first-fix before boarding. Commissioning after decoration is how stains appear. Put that sequence in the contract.
The London ducted guide covers cornice and listed constraints.
Frequently asked questions
Is concealed air conditioning silent?
No. Fans and air movement remain. A tight duct or weak hatch can make it worse than a good wall unit.
Can I conceal a unit in an existing UK ceiling?
Only if depth, structure and access work. Many existing houses cannot. A renovation is the usual moment.
Does concealed mean no outdoor unit?
No. There is still a condenser, pipework and F-gas work.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.