Ground-source heat pump
Air-source heat pump
Accessories
What is a heat pump
Air stoves
Pellet boilers
Ducted air stoves
Hydro stoves
Accessories
Insert pellet stoves 
Wood stoves 
Wood boilers
Insert wood stoves
Charcoal oven 
Aerothermal energy has established itself as one of the best alternatives for heating and cooling flats and homes that have already been built, even without the need for major renovations.If you live in a city or an old house and are looking to reduce your energy bill and increase your comfort, discover how aerothermal energy can be adapted to your home and what advantages it offers over other traditional solutions.
What types of aerothermal energy can be installed in flats and homes without major renovations?
There are currently several aerothermal options designed to facilitate installation in existing homes, minimising construction work and disruption:
- Split air-to-air heat pumps: These work like a reversible air conditioner, providing both cooling and heating. They only require the installation of one outdoor unit and one or more indoor units. This is the simplest and quickest option for flats.
- Compact air-water heat pumps: These provide heating, cooling and domestic hot water. Monobloc models take up little space and can be connected to existing radiators or fan coils, without the need for underfloor heating.
- Aerothermal energy for radiators: There is specific equipment that works at higher temperatures and is compatible with traditional radiators, avoiding the need to change the entire heating system.
- All-in-One systems: These integrate a heat pump and DHW tank in a single compact module, ideal for homes with limited space.
Find out more about the types of aerothermal energy and their advantages in our article What is aerothermal energy and what are its advantages?
Real examples of installations in flats and old houses
More and more owners of flats in cities and old houses are opting for aerothermal energy to modernise their air conditioning systems:
- Flat in Madrid, 85 m²: Installation of a monobloc air-water heat pump connected to existing radiators. No major building work or pipe replacement required. 50% savings on heating compared to natural gas.
- Apartment in Barcelona, 70 m²: Replacement of old air conditioning with a split inverter aerothermal system. Efficient climate control all year round and 40% reduction in electricity consumption.
- Semi-detached house in Valencia, 120 m²: Installation of an All-in-One system for heating, cooling and DHW. Only a small space in the laundry room and one day of installation were required.
Would you like to know more about how to install aerothermal energy in an existing home? Read our article: Can aerothermal energy be installed in an existing home?
Costs, installation times and minimum requirements
| Type of system | Price (installed) |
|---|---|
| Air-to-air split (1×1) | £1,500 – £2,500 |
| Monobloc air-to-water heat pump | £4,500 – £7,000 |
| All-in-One system | £6,000 – £9,000 |
- Aid and subsidies: In 2025, there will be significant public aid available to cover up to 40% of the total cost.
Installation times
- Air-to-air split: 1 day
- Air-to-water heat pump: 2-3 days
- All-in-One: 2 days
Minimum requirements
- Space for the outdoor unit (balcony, patio, façade or roof).
- Access to install the indoor unit (kitchen, laundry room, bathroom).
- In some cases, permission from the residents’ association to install the outdoor unit.
Comparison with other solutions (gas, electric, split)
| System | Initial investment | Annual consumption | Maintenance | Service life | CO₂ emissions |
|---|---|---|---|---|---|
| Aerothermal | Medium | Very low | Low | 15-20 years | Very low |
| Natural gas | Low | High | Medium | 10-15 years | High |
| Direct electricity | Very low | Very high | Low | 10 years | High |
| Air conditioning | Low | Medium | Low | 10-12 years | Medium |
Advantages of aerothermal energy
- Up to 70% energy savings compared to electric or gas systems.
- Minimal emissions and greater efficiency.
- Quick installation and adaptable to existing homes.
- Compatible with radiators, fan coils or split systems, without the need for underfloor heating.
Conclusion: the best option for modernising your home
Aerothermal energy is the ideal solution for those seeking efficiency, savings and sustainability in existing flats and houses, without the need for major building work. Its versatility and quick installation make it the smartest alternative to traditional systems.
Would you like to find out more or request a personalised quote? Visit our aerothermal heat pumps page and discover how you can transform your home into a more efficient and comfortable space.
