Air conditioning installation in Dorset

In a Dorset village heated by oil or LPG, a wall-mounted split system is as much a winter purchase as a summer one. It is a reversible heat pump: it cools the room in August and heats it efficiently through the rest of the year. For a cottage where the living room is the only room used most evenings, that can mean the boiler runs far less, with summer cooling as the extra.

The other early decision is where the outdoor unit goes. Dorset has over 9,000 listed buildings [1] as well as its town and village conservation areas, and both limit the choice.

Two councils, and which one is yours

Since 2019 Dorset has had two unitary councils. Bournemouth, Christchurch and Poole Council covers the conurbation; Dorset Council covers everything else, from Lyme Regis to Shaftesbury [4]. The boundary catches people out: Wimborne, Ferndown and Verwood sit close to the conurbation but fall under Dorset Council. The conurbation has its own Bournemouth page; this page covers the rest of the county.

Using a split system to burn less oil

An air-to-air system heats only the rooms it serves. It will not heat your water and it does not replace the boiler, so in an oil-heated house the realistic plan is one or two units in the rooms used every day, with the boiler kept for hot water and the coldest weeks. That is a smaller, cheaper project than a whole-house heat pump. The heating and cooling guide shows how the comparison works, including where a boiler still wins, and our grants guide sets out the current grant position for air-to-air systems.

If you are weighing up the whole house (heating, hot water and cooling together), the planner compares complete systems rather than single rooms.

National Landscapes, conservation areas and listed buildings

The Dorset and Cranborne Chase National Landscapes together cover 56% of Dorset Council's area [1], but National Landscape status does not change where a house's outdoor unit can go under permitted development. The rule against a wall or roof fronting a highway applies in conservation areas, such as those in Bridport, Sherborne, Shaftesbury and Wareham, and listed buildings have no permitted development rights at all [2]. The planning permission guide helps you check a position before anyone prices it.

If the house is listed (Historic England's National Heritage List will tell you [3]), external plant and new holes through historic fabric need listed building consent before any work. Expect the conversation to be about routing pipework through an outbuilding, a later extension or an existing opening; the old houses guide covers the usual options. Thick rubble-stone walls are slow to core drill, and the hole needs sleeving and sealing so the wall stays dry.

Thatch needs its own rule: keep the condenser, its cable and its pipework well away from the roof. No fixings into thatched eaves, no runs up through the thatch, and a condenser on a gable wall or a ground stand rather than under the eaves. If your insurer has conditions for thatched properties, tell the installer before the survey.

The exposed coast

On the coast at Weymouth, Portland, Lyme Regis and Swanage, salt-laden wind corrodes an untreated condenser coil early. The Bournemouth page sets out the salt-air specification.

Poundbury

Poundbury has its own design code; check before choosing a position. The houses are modern and well insulated, so sizing follows the new build guide.

Holiday lets and second homes

Guests need simple controls, so choose a unit with a plain remote and, where the controller allows it, limit the range of temperatures guests can set. Wi-Fi control lets you warm the house before a winter arrival, or check that a unit has been switched off. Book the annual service between lets rather than in August. Caravans and lodges on holiday parks are a different job; the static caravan guide covers them.

What it costs

The cost guide has the national figures, and the cost estimator gives a range for your rooms. What adds to a Dorset quote is listed building consent work, longer pipe runs to reach a permitted position, coastal-grade coils and fixings, and travel to remote addresses. The installer guide covers the F-gas checks.

Dorset questions

My cottage is in the National Landscape. Do I need planning permission? Often not, for a house. National Landscape status adds no siting condition of its own; what changes the answer is a listed building, a flat, or a conservation area position fronting the road [2]. Dorset Council can confirm for a specific address.

Will a split system replace my oil boiler? Not on its own. It heats the rooms it serves efficiently, but it does not heat water. Most owners use it to cut how often the boiler runs.

Next step

Over the border, the Hampshire page covers the New Forest villages and the Solent coast. For anywhere in Dorset, request an installer match and tell us which rooms you want heated or cooled, how the house is heated now, and whether it is listed, thatched or close to the sea. We'll review your requirements and match you with a suitable installer operating in your area.