Air conditioning in a conservatory; the hardest case in the house

Before any kit conversation, the building tells you what is possible. A conservatory typically presents glazed walls and roof. Most also carry significant solar gain. These facts shape every later decision about comfort.

The most common issue this property surfaces is bedroom overheating, followed by cold rooms. Any sensible plan addresses those first.

The constraint is physics. A glazed roof in full summer sun can admit more heat than a typical domestic split can remove, which means the unit runs continuously and the room still struggles to reach a comfortable temperature. No size of indoor unit overcomes a roof that is acting as a solar collector.

Address the roof before the cooling. A solid roof conversion, an internal reflective film or an external roof blind reduce the peak load enough that a modest split can keep the room useable through the worst weeks of the year.

Where the roof cannot change, accept that the conservatory will be a shoulder-season room rather than a midsummer one, and put the cooling budget into the adjoining living space instead. A split serving the kitchen-diner often makes the conservatory more useable than a split inside the conservatory itself.

The published cost range for this work lives in the cost registry, not on this page. The scope it covers is single-room split air-conditioning unit, professionally installed.

The published range assumes a typical room rather than a fully glazed envelope; expect higher running costs in a conservatory and shorter unit life because of the duty cycle.

Conservatories are the rooms that flatter the cooling industry's marketing and disappoint the homeowner who acts on it. The defensible answer is to fix the roof or accept the room's season, not to oversize the cooling. The owners who pretend otherwise tend to be the ones replacing the unit five years in.