Aerothermal Installation with In-House Engineering

At Fotovol we develop thermal engineering projects based on high-performance air-to-water heat pump technology. We design solutions that harness the energy of the air to cover heating, cooling and Domestic Hot Water (DHW) demands with an optimised seasonal performance coefficient.

Our approach integrates precise thermal load calculation, building inertia analysis and hybridisation with photovoltaic generation systems, guaranteeing an A+++ class climate infrastructure that minimises primary energy consumption and maximises savings from day one.

If you already have solar panels or are considering installing them, we integrate the heat pump with your photovoltaic system so that electrical surplus is converted into thermal storage — heating and DHW at virtually no cost during peak solar production hours.

At Fotovol we analyse each case and propose the most efficient architecture according to the building, the existing emission system and the client’s energy objectives. We work with the leading manufacturers on the market [Daikin, Mitsubishi, Panasonic, Fronius… ] to guarantee maximum reliability and performance in every project.

Monobloc architectures: Compact hydronic systems with glycol management to prevent freezing. Ideal for space optimisation and simplified maintenance. The entire refrigeration circuit remains outside, reducing the complexity of the interior installation.
Split / Bibloc systems: Direct expansion configurations that eliminate thermal losses in exterior transport, allowing greater hydraulic distances and precise DHW module control. The preferred option when interior space allows housing the hydraulic unit.
Low Enthalpy Emitters: Integration with underfloor heating and fan coils sized to work with reduced thermal differentials, maximising heat pump performance. This is the highest efficiency scenario: flow temperatures between 30°C and 35°C with SCOP values above 4.

Unlike conventional installers, at Fotovol we design each installation to maximise real seasonal performance, not just the equipment's nominal COP. These are the technical criteria we apply in every project:

Seasonal SCOP Optimisation: We design the installation to maximise the seasonal performance coefficient, ensuring energy transfer above 400% (COP > 4) under real conditions of use.
Electronic Expansion Valve (EEV) Management: We implement equipment with precise refrigerant flow control, guaranteeing thermal stability and high efficiency even under extreme outdoor temperature conditions.
High-Performance Plate Heat Exchangers: We use the latest generation thermal transfer technology in the secondary circuit to minimise energy losses and optimise the thermal differential.
Smart Defrost: We configure advanced algorithms to minimise inversion cycles, avoiding unnecessary energy consumption during high humidity periods.

Integration with underfloor heating and existing systems

One of the most frequent questions before installing an aerothermal system is whether it is compatible with the existing installation. At Fotovol we carry out a prior technical analysis to determine real feasibility and the most efficient solution in each case.

- Low Enthalpy Systems (Underfloor Heating): We design circuits with flow temperatures between 30°C and 35°C — the highest efficiency scenario for the heat pump. If your home has underfloor heating, aerothermal is the optimal combination.
- Hybridisation with Existing Radiators: It is entirely viable to keep existing radiators provided a calculation of the emitter surface is carried out. In many cases, by improving insulation or adjusting the climate curve, existing radiators can operate at low temperature (45-50°C), maximising savings without civil works.
- DHW Production via High-Efficiency Storage Tanks: We size specific aerothermal tanks with oversized coils to guarantee hot water with minimum electrical backup. We implement electronic anti-legionella thermal disinfection protocols coordinated with solar surpluses.
- Zoning via PID Control: We implement control systems that allow managing different thermal demands per room, optimising compressor modulation and reducing overall consumption.

Aerothermal and photovoltaic integration

Integrating the heat pump with a photovoltaic system enables active demand management. Through the use of inertia tanks and accumulators, we convert electrical surplus into thermal storage — heating and DHW at virtually no cost during peak solar production hours.

- Preventive overheating: We configure equipment to raise the thermal setpoint of the DHW and inertia tank during peak solar irradiation hours, drastically reducing grid consumption during the night period.
- Surplus utilisation: Reduction of grid injection through controlled elevation of the thermal setpoint. The building structure itself acts as a thermal battery.
- Cycle optimisation: Reduction of compressor starts through logical programming based on real photovoltaic production, optimising equipment lifecycle.

Aerothermal installation can benefit from various grants that significantly reduce the initial investment. In 2026, tax deductions, municipal bonuses and regional programmes remain active, making the switch to heat pump technology more accessible than ever.

Income tax deduction (IRPF): Between 20% and 60% of the investment depending on the energy savings achieved, valid until 31 December 2026.
Energy Saving Certificates (CAE): Can cover up to 15% of the installation cost through certification of the energy savings generated.
Municipal bonuses: Discounts on IBI and ICIO taxes depending on the municipality where the installation is carried out.
Regional programmes: Specific grants from each regional government, especially for combined aerothermal + photovoltaic installations.

At Fotovol we fully manage all available grants for your project. Check all specific incentives for aerothermal systems in our aerothermal grants guide.

Frequently asked questions about aerothermal installation

Can I keep my existing radiators with an aerothermal system?

Yes, in most cases it is entirely viable. We carry out a calculation of the emitter surface of the existing radiators to determine whether they can operate at low temperature (45-50°C). In many cases, by improving insulation or adjusting the climate curve, no additional civil works are required. We confirm this before preparing any quote.

How much does it cost to install an aerothermal system?

The average cost of an aerothermal installation in Spain is between €8,000 and €12,000, depending on the required power, the existing emission system and installation complexity. With income tax deductions valid until December 2026 (between 20% and 60% of the investment) and available regional programmes, the final cost can be significantly reduced. Contact us and we will prepare a detailed no-obligation quote.

Can I integrate aerothermal with my solar panels?

Yes, and it is the most energy-efficient combination. We configure the heat pump to use photovoltaic surpluses during peak solar production hours, performing preventive overheating of the DHW and inertia tank. The result is virtually free heating and hot water during the day, with minimal grid consumption at night.

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