€1,000 discount when installing Aerothermy, now with better payment facilities than ever before. Up to 30 April

Aerothermy: renewable heating

Discover the most efficient technology to enjoy heating, hot water and cooling in your home.

  • Save all the time: 75% of the energy used through aerothermy is free because it is extracted from the air.

  • We take care of the installation and supply of the equipment

  • We help you with financing and management of subsidies

What is aerothermy?

How does it work?

Ilustración Aerotermia

Outdoor unit

A high-efficiency heat pump installed outside the house extracts energy from the ambient air (free of charge). Similar to an air conditioner, but larger.

Indoor unit

It uses energy from the air to heat and store water, which is then distributed to taps, radiators and underfloor heating to generate renewable heating and hot water in winter. In summer, it can generate cold water for cooling via underfloor heating or fan coils.

Find your Aerothermy solution

Make the most of your existing heating system, whether you have radiators or underfloor heating:

What does the Aerothermy installation with Iberdrola include?

No surprises, installation with everything you need to enjoy the advantages of Aerothermy

Request a quote for Aerothermal energy

We advise you to find the perfect solution for you

*Campos obligatorios

Do you have any questions?

Here are some of the most frequently asked questions

What it is?

Aerothermal energy is a system that uses an electrical input (25%) together with the energy from the ambient air (75%) to heat or cool water for use in heating and domestic hot water (DHW) in winter and cooling in summer.

As it is a technology that is 4 times more efficient than a conventional boiler, Aerothermal energy is able to provide optimum heating comfort in the home, maintaining a constant temperature at all times.

In short, it is a technology designed to replace heating equipment that uses fossil fuels (gas or diesel oil) with aerothermal systems that use clean, renewable energy from the environment, thereby reducing CO2 emissions released into the atmosphere.

The final savings depend on many factors, such as the current fuel price, but most of the savings come from the high efficiency of aerothermal energy. In the case of a conventional oil boiler, savings of up to 75% could be made on the energy consumption bill.
Aerothermal energy will always offer better performance and greater savings if combined with low-temperature heat or cold emitting systems such as underfloor heating.
Are photovoltaic and aerothermal energy a good combination?
The best way to combine both solutions is to enhance the benefits of each, as not just two renewable energies are used in the household. In addition, the electricity produced by the photovoltaic panels supplies the electricity needed for the aerothermal energy system (that 25%) and the heating/cooling and domestic hot water generated would be practically at zero cost under optimal sun conditions.
With both renewable technologies we managed to reduce the demand for non-renewable energy by more than 60%.

Aerothermal energy
  • Heating

    Hot water through underfloor heating or radiators

  • Cooling

    Cold water through underfloor heating/cooling or fancoils

  • Domestic hot water

    The indoor unit includes a tank where it is stored

  • Energy used

    Renewable (75% outdoor air and electricity)

  • Heating

    Hot water through underfloor heating or radiators

  • Cooling

  • Hot water

  • Energy used

    Gas, diesel, pellets

Air conditioning
  • Heating

    Hot air

  • Cooling

    Cool air

  • Hot water

  • Energy used


Both Aerothermy and air conditioning are called heat pumps because they have a similar operation; however they have different functionalities.
Air conditioning is an air-to-air heat pump because it exchanges energy with the outside ambient air, which it uses to cool the air inside our home in summer and heat it in winter.
Aerothermy is an air-to-water heat pump because it transforms the energy from the outside air into hot water for us to be able to shower and have heating in winter and can also produce cold water for cooling in summer.
Therefore, Aerothermy combined with underfloor heating is a more complete system because it covers the needs of heating, cooling and hot water for showers and taps

Aerothermal energy is classified as renewable energy according to the European Parliament directive 2009/28/EC.
It is a 100% electric, renewable and clean technology.

Because it uses 75% outside air as a renewable, natural and inexhaustible energy source to heat or cool the water as needed. Aerothermy is considered renewable due to its high efficiency; produces more energy than it consumes: in particular, for every 1 kW of electricity consumed, it generates up to 4 kW.

Signing up

Any residential customer, whether or not they are Iberdrola customers.

You can sign up for the service by calling 900 22 45 22 or by leaving your details on our form.


It is a system designed for any type of home. Aerothermal energy can be used as long as we have the necessary space to locate the indoor and outdoor units required in the installation.
The indoor unit is about the same size as a refrigerator and the outdoor unit is slightly larger than an outdoor air conditioning unit. The outdoor unit is usually placed on the floor, as in most cases it cannot be hung high.

Aerothermal energy is compatible with various types of radiators and works very efficiently in combination with this system. However, it is true that its performance is higher and more usable with heat emitters that operate at low temperatures, such as underfloor heating or low-temperature radiators.

It can work with a split system that you already have installed in your home (only in some models and adapting the installation).

The coefficient of energy efficiency in heating mode or COP is a concept used to measure the theoretical efficiency of a device. Generally speaking, it can be defined as the ratio between the energy produced (or heating power) and the energy consumed.
The higher the COP, the higher the performance of the equipment.

The fan coil is powered by electricity and hot or cold water. This water passes through coils that transfer the temperature to the air expelled by the appliance and, in this way, cold or hot air is generated as required.
If you want to have equipment similar to air conditioning, powered by aerothermal energy, the most advisable thing to do would be to install fan coils. In the latter case, the installation cost could be between €500 and €800 per unit.


There are several points to assess:
  • If you already have heating installed and you wish to change your gas or oil boiler for Aerothermal energy, you would only have to replace one unit with another, taking advantage of the existing installation.
  • Aerothermal energy reaches its maximum efficiency with underfloor heating, which allows heating in winter and cooling in summer, although it can also work perfectly well with traditional radiators without reducing comfort, although in this case its use would only be possible for heating, without cooling.
  • With this in mind, equipment with basic installation for a 100m2 house with a heating circuit can cost as little as €8,000.

We offer financing for up to 120 months through the main financial institutions.

As it is a renewable technology, aerothermal energy is directly subsidised to promote its use and installation. Subsidies are available at state, regional and municipal level. You will be able to choose one or the other, depending on the type of property and the customer's different characteristics.
At Iberdrola we will advise you and manage the application and processing of the corresponding subsidy for customers who contract Smart Clima Aerotermia. Subsidies may come either directly (installation subsidy) or indirectly in the form of a deduction. Click here to consult the subsidies.

The amount of the grant will vary depending on the grants applied for. In the most favourable cases, the amount of grant may be up to 80% of the total cost of the installation.
The available grants can currently be consulted on the Iberdrola grants portal..
There are also additional grants at municipal level, which are usually related to direct IBI discounts.
In addition, the installation of Aerothermal energy receives an income tax deduction of up to 40% and in conjunction with photovoltaic installations it can reach 60%.

Programme 6 grant for renewable air-conditioning:

The most common grant for installing an aerothermal energy system is the programme 6 grant, which provides €500 per kW reaching up to €3,000 (which is reached in most cases). We illustrate some typical cases that can be financed with this grant:
RD 477/2021 establishes additional grants for demographic challenges (see PREE 5,000), for municipalities with up to 5,000 inhabitants and for non-urban municipalities with up to 20,000 inhabitants in which all their singular population entities have up to 5,000 inhabitants.


Installations must be carried out after 1 July 2021 in the case of individuals, and after the date of the grant application in the case of companies. To process your grant, you must register and apply for your grant on Iberdrola's grant management platform before 5 December 2023.


These grants shall be incompatible with other subsidies or grants that may be awarded for the same purpose.

How to apply for them:

We take care of everything. Register and apply before 5 December 2023.

Other grants for optional compatible items:

There are additional, complementary grants to the Aerothermal Energy subsidy, such as for underfloor heating or for dismantling an existing installation.
  • For underfloor heating installation (€600 per kW up to €3,600)
  • To replace radiators with low-temperature radiators (up to €1,830)
  • To install fan coils (up to €1,830)


Any more questions?

We'll resolve them for you via any channel.