A complete aerothermal installation is a serious project. It starts with calculating the thermal loads of the dwelling, sizing the unit according to actual needs, choosing between radiators only, underfloor heating only, or a combination, planning space for the DHW tank and outdoor unit, and providing a fixed quote. The air-to-water heat pump, also called aerothermal heating, goes a step further. The outdoor unit heats or cools water that circulates through radiators, underfloor heating, or fan coils to condition the home, and simultaneously heats a domestic hot water tank of approximately 200 litres for showers and taps. It handles everything with a single unit, ideal for detached houses and large homes. Payback compared to a traditional gas + air system is 8 to 12 years in the local climate. We arrive with a full set of instruments. Manometers for pressure, contact and infrared thermometers, electronic gas leak detector, multimeter, and clamp meter for electrical measurements. We also bring the specific diagnostic software for each brand to read error codes stored on the control board.

The indoor fan is blocked by accumulated dirt or worn bearings. When the fan doesn't spin at the correct speed, air doesn't circulate properly over the coil, and the room feels much colder even though the unit is running. Diagnosis begins with a brief interview with the client about when the problem started, how it manifests, and if anything extraordinary happened before (storm, unit moved, impact). It continues with a visual inspection for oil stains indicating leaks, visible mechanical damage, or accumulated dirt. Then, electrical measurements and refrigerant analysis with manometers. Once the cause is identified, a fixed quote for the repair is provided, compared with the cost of a new unit if the damage is extensive. Gas leak at the outdoor unit fitting, especially in units over 5 years old. Salt air and thermal expansion from summer to winter can loosen fittings. A small leak gradually reduces the charge, and the unit cools less effectively each season. Repair involves detection with a professional gas detector, replacement of the fitting or soldering the copper, vacuuming, and recharging.

Official manufacturer warranty (5-7 years) plus our labour coverage. Electronic control board failure due to power surges, moisture, or component aging. This is relatively common in areas with electrical storms like the interior of Vega Baja in August. Repair may involve replacing the entire board or, if locatable, replacing specific capacitors or resistors. It depends heavily on the model and parts availability. 5-7 years official manufacturer warranty depending on the brand (Daikin, Mitsubishi, Bosch, Vaillant). Plus our 30-day coverage on labour and recommended annual checks.

The cost for a gas refill in Sant Just Desvern typically ranges from €126 to €1602. The final amount depends on the property's condition, materials, and labour time. We always provide a fixed quote before starting. As a general rule, if the repair cost exceeds 60% of the price of a comparable new unit, it's not cost-effective. The reason is that repairing an expensive component leaves the rest of the unit at its original age. Other components will likely fail soon. Replacing the compressor of a nine-year-old unit for a significant sum, knowing that the electronics and fans are also ageing, is generally a poor investment. Older models without inverter technology start and stop abruptly at full power, which stresses the compressor more. Modern inverter models modulate smoothly and last longer. Their electronics are more sensitive, and from the seventh or eighth year onwards, board failures occur that require replacing the entire module. The decision between repairing it or replacing the unit depends on the cost of the part versus the price of a comparable new unit.