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Is it possible to install aerothermal energy in a house already built?

14/04/2025

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You feel well in the apartment you are in but you are wondering if you can install aerothermal energy in an already built house or if it can only be included if it is a new construction. The answer is yes, even if it is a built house, it can be included with some previous adaptations.

You know that aerothermal energy is an efficient and sustainable technology that uses the energy of the outside air to air condition your home, but… what do you need to consider, how to prepare your home and what steps to follow for an installation?

Benefits of installing aerothermal energy in an existing home

Before going into the technical details, it is worth remembering why so many people are betting on this system:

  • Energy savings: reduces electricity bills and eliminates gas.
  • Clean energy: it takes advantage of a renewable source (air).
  • Year-round comfort: heating in winter, cooling in summer.
  • Compatible with subsidies and grants for energy rehabilitation.

What to consider before installing aerothermal energy in an existing house

Although it can be installed, there are key aspects that you should consider so that the system works correctly and you do not have problems in the medium term.

1. Insulation of the dwelling

Insulation is crucial. If your house loses a lot of heat, the fan heater will have to work harder, and its efficiency will drop.

What can you do?

  • Insulate cavity walls and dormers.
  • Install double-glazed windows with thermal break.
  • Sealing gaps in doors, sockets, shutter boxes, etc.

Current heating system

Can I use my old radiators? Yes, although if they are high temperature, the performance will be lower. Our aerothermal technicians will help you make the right decision: take advantage of what you have or it is better to change the whole system.

Recommended options:

  • Low temperature radiators.
  • Underfloor heating (if you are going to renovate).
  • Fan coils (water emitters with fan, very efficient).

3. Distribution of spaces

Not all homes require complete air conditioning. You can opt for specific areas (living room, bedrooms…) to reduce the initial cost and adapt the system to your usage habits.

4. Space for outdoor unit

The heat pump needs to be installed outdoors and must have adequate ventilation. Do not be afraid of the noise you may cause to the neighbors as there are now very quiet models that are hardly noticeable when in operation if placed correctly.

Where to place it?

  • Terrace or patio.
  • Facade (consulting municipal regulations or community of neighbors).
  • Flat roof.

5. Electrical installation

Aerothermics requires electricity. In some homes it will be necessary:

  • Increase the contracted power.
  • Improve the electrical panel.
  • Install additional protections.

The aerothermal is compatible with theinstallation of solar panels in your home, so if you are thinking of integrating it now is the time.

What you should ask yourself before deciding

Ask yourself these questions to find out if you are ready to take the plunge:

  • Is my home well insulated?
  • Do I have room for the outdoor unit?
  • Do I use heating frequently?
  • What type of radiators do I have?
  • Do I have adequate electrical installation?
  • Am I willing to do a little work if necessary?

Recommended improvements before installing aerothermics

Some of the most recommended improvements before installing an aerothermal system:

  • Insulate attic and cavity walls.
  • Install watertight doors and windows.
  • Sealing cracks in walls, frames and passage points.
  • Check electrical installation.
  • Evaluate type of emitters (radiators or underfloor heating).

What to do if you have doubts

Not all homes are the same, and not all households have the same energy needs. Therefore, it is best to make a few calculations before making the change:

  • To make a thermal study of the house.
  • Calculate the power required.
  • Assess the most suitable equipment.
  • Estimate savings and amortization.
  • Help you apply for grants or tax deductions.

All you need is a good pre-assessment, a custom design and a reliable installer. If done right, it is an investment that improves your comfort, reduces your consumption and increases the value of your home.

Would you like to know if your home is suitable for installing aerothermal energy? In Fotovol we offer you a personalized and non-binding study to install aerothermal energy in your current home.

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