When nothing can go overhead.

Heritage and listed interiors forbid it.

Exposed structures have no void to use.

Refurbishments often find the void already full.

It needs no ceiling work at all.

That constraint decides more often than preference.

Floor area, and clearance in front.

The space it occupies is usable space.

Furniture cannot be placed against it.

Discharge must not be blocked.

That footprint is the real trade.

Check it against the room layout early.

Well in open spaces, poorly in partitioned ones.

Air discharges low and travels up and across.

Open halls and showrooms suit it.

Cellular offices do not.

Anyone sitting in the discharge will complain.

Position against the room's use, not the pipework.

There is more room for coil and fan.

A wall unit is constrained by its casing.

One or two floor units can serve a large space.

That reduces pipework and control complexity.

Fewer units also means fewer filters to clean.

It suits single large volumes.

Usually by a pump.

Gravity drainage from floor level rarely exists.

The pump becomes a maintenance item.

Discharge pipe routing needs planning.

A failed pump shows as water on the floor.

That is at least visible immediately.

Considerably, and it is underrated.

Everything is reachable from the floor.

No access equipment or ceiling hatch is needed.

Filter cleaning actually happens as a result.

Replacement at end of life is simpler too.

That matters over a twenty year life.

It is required exactly as for any split system.

Pipe route from floor level still needs planning.

Heritage buildings often restrict external plant.

Screening or siting may be conditioned.

Establish that before selecting indoor equipment.

It is the usual planning obstacle.