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Air conditioning installation

A split air conditioner for one room costs €1,500 to €3,500, fitted. A multi-split for 2 to 4 rooms is €3,500 to €7,000, and a whole house €6,500 to €18,000. A reversible air-to-air system that heats as well can get an SEAI grant of up to €7,500.

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  • €1,500 to €3,500one room, fitted
  • €3,500 to €7,0002 to 4 rooms
  • €6,500 to €18,000whole house, multi-split
  • €7,500top SEAI grant for air-to-air heating

Split, multi-split or ducted

  • Split. One indoor unit and one outdoor unit. The usual choice for a bedroom, an office or a garden room.
  • Multi-split. One outdoor unit feeding 2 to 5 indoor units. Fewer boxes on the wall outside.
  • Ducted. A hidden unit in the attic or ceiling with grilles in each room. Neater and dearer, and easiest to plan into a renovation.
  • Portable. A box with a hose out the window. Cheap, noisy and far less effective. No installation needed.

Most units sold now heat as well as cool. Used for heating, they're air-to-air heat pumps, and that's what the SEAI grant is for.

Grant, planning and F-gas

  • SEAI grant. Up to €7,500 for an air-to-air heat pump, made up of €3,500 for the unit and the €4,000 Renewable Heat Bonus when it replaces oil, gas, solid fuel or electric storage heating. Cooling-only units get nothing. The home must be built and occupied before 2021, the contractor SEAI-registered, and the grant approved before work starts.
  • Planning. An air source heat pump on a house is exempted development under Class 2(d), within limits: no more than 2.5 m² in total, at least 50 cm from any edge of the wall or roof, not over a public road, and no louder than 43 dB(A) (or 5 dB(A) above background) at the nearest neighbour's home. A protected structure, or a condition on your planning permission, can change that.
  • F-gas. Fitting a unit means connecting a refrigerant circuit, so it's work for an F-gas certified engineer. Fixed units can't be fitted DIY.

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Straight answers to what people ask most: itemised costs, specifications, planning or grants, and what to check before you book.

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More guides & resources: The SEAI heat pump grant · Heat pump vs air conditioning · F-gas engineers · All guides & calculator hub · Technical & trade glossary · Frequently asked questions · All areas covered · About this site

Questions we get asked

How much does air conditioning cost in Ireland?

€1,500 to €3,500 for one room, fitted. €3,500 to €7,000 for 2 to 4 rooms on a multi-split.

Do I need planning permission for air con?

Usually not for a heat pump unit on a house within the Class 2(d) limits: 2.5 m² in total, 50 cm from the edges of the wall, 43 dB(A) at the neighbours.

Is there a grant for air conditioning?

For a reversible air-to-air heat pump used for heating, up to €7,500. Not for cooling-only units.

How much does it cost to run air con in Ireland?

An inverter split unit cooling one room for a few hours a day costs a few euro a day in a warm spell. Running costs depend on your tariff.

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