ᐅ KfW Energy Calculation with a Cooling Heat Pump

If you want to cool properly, you need an air conditioning system.

@DaSch17

When it comes to effectively cooling with a controlled residential ventilation system, adding a pre-cooling coil is more or less ineffective if the rest of the system remains as it is typically designed. The geothermal heat exchanger causes more problems than it solves. Similarly, cooling through underfloor heating is nothing more than a drop in the bucket; it lowers the temperature only by a few degrees and cools the floor slightly... but the air where you actually want cooler conditions, around 1 meter (3 feet) above the finished floor, remains mostly unchanged. This is because the mentioned dehumidification is minimal and the air circulation is too low.

Certainly, with a combination of measures—here a bit, there a bit—and with automated shading, it is possible to cool a house sufficiently to make it comfortable.

However, if you really want to cool effectively to 22–23°C (72–73°F), you should consider air conditioning, and the annual operating costs of 200–300 euros should not really be a deterrent.

Mycraft schrieb:

If you really want to cool down effectively to 22-23°C (72-73°F), you should consider air conditioning, and the annual operating costs of 200-300 euros shouldn’t really deter you.

Another reason to install a photovoltaic system on the roof. That way, you can make good use of the electricity in the height of summer.

Thank you all for your assessments! Since we already have an 8 kWp photovoltaic system, we can also use an air conditioning system in the height of summer and power it with the electricity from the photovoltaic system.

Markus254 schrieb:

Thank you for your assessments! Since we already have an 8 kWp photovoltaic system, we can also use an air conditioning unit in midsummer and power it with solar electricity.

Always install as much photovoltaic capacity on the roof as possible! Electricity demand is likely to increase in the coming years (due to electric vehicles, global warming, and the resulting costs for air conditioning, etc.) rather than decrease.

nordanney schrieb:

Another reason to install a photovoltaic system on the roof. This way, you can make very good use of the electricity during the height of summer.

Even better: the photovoltaic system helps protect the roof from overheating, as the sunlight does not directly reach the roof tiles. Windows can be shaded in other ways (roof overhang, strategic placement, building recesses, etc.) or, if necessary, protected with adjustable external blinds as needed.