Wall-Mounted vs Cassette vs Floor AC Units

Wall-mounted units are by far the most common indoor unit style in UK homes and small offices. They sit high on a wall and blow conditioned air down and across the room. They are the most affordable to supply and the quickest to install, and modern units are slim, quiet and discreet.

A wall unit suits almost any standard room, a bedroom, living room, home office or small shop. It pairs with both single split and multi-split systems. If you simply want effective, cost-effective cooling and heating in a normal room, a wall-mounted unit is usually the right answer. You'll find typical prices on our cost guide.

Cassette units recess into a suspended or false ceiling, sitting flush so only a slim square or rectangular grille is visible. They distribute air in two, three or four directions, giving even coverage across a wide space, which is why they are popular in offices, retail units, restaurants and reception areas.

Cassettes need a ceiling void to house the unit body, so they are best suited to commercial buildings with suspended ceilings rather than typical homes. The pay-off is a tidy, almost invisible installation with excellent air distribution. For larger fit-outs, multiple cassettes are commonly run from a multi-split or VRF system. We fit cassette units from Daikin, Mitsubishi Electric, Fujitsu and Samsung.

Floor-standing (or floor-mounted) units sit at low level, much like a radiator. They are the practical choice where there is no suitable high wall space, where ceilings can't take a cassette, or in rooms with large windows, sloped ceilings or limited wall area such as conservatories and loft rooms.

Because they sit low, floor units deliver heat effectively at floor level, which can make them a strong pick for rooms used heavily in winter, remembering that every unit is a reverse-cycle heat pump that heats as well as cools. They are easy to access for servicing too. The trade-off is that they take up floor space and can be partly obstructed by furniture, so placement matters.

Match the unit to the room, not the other way round. Use a wall-mounted unit for most standard rooms; a cassette where you have a suspended ceiling and want a discreet, even-coverage solution; and a floor-standing unit where high wall space or ceiling voids aren't available. In a multi-room project you can mix styles on a single multi-split system, a cassette in the open-plan kitchen, wall units in bedrooms, a floor unit in the conservatory.

The best way to specify a system is a free site survey, where we assess each room's layout, heat load and the best unit type. Our installation team covers Guildford, Farnham, Woking and the wider Surrey area, and can advise on the right mix for your home or premises.