ᐅ Combination of Heat Pump and Ventilation System – What to Consider?
Created on: 16 Jun 2025 12:36
L
LarsBr80
Hello, I have another question for the ventilation experts:
We have now installed decentralized Southwind Ambientica smart fans from Luftbude after renovation, and use an air-to-water heat pump for heating. Both systems are controlled separately.
Is there anything to consider during setup, daily use, or control to ensure that both run optimally and efficiently together?
We have now installed decentralized Southwind Ambientica smart fans from Luftbude after renovation, and use an air-to-water heat pump for heating. Both systems are controlled separately.
Is there anything to consider during setup, daily use, or control to ensure that both run optimally and efficiently together?
N
nordanney16 Jun 2025 13:24LarsBr80 schrieb:
Is there anything to consider regarding setup, daily use, or control to ensure both work together optimally and efficiently?No. Both operate optimally on their own (if properly configured); there are no dependencies between them.
Hello Lars,
Both systems are smart enough to complement each other perfectly. The most important principle is this: your ventilation ensures that the heat generated inside the house stays there. As a result, the heat pump simply has to work less and runs very efficiently.
For your ventilation settings, this means you should rely fully on the automatic mode. Just set a low base level and let the humidity sensors in the ventilation unit take care of the rest. The fans will only speed up when really necessary, such as during showering or cooking. This saves the most energy.
For your heating settings, the key to saving money is to keep the heating curve as low as possible. Since you have minimal heat losses, the heating only requires a low flow temperature.
Basically, it’s quite simple. The ventilation runs in automatic mode and ensures minimal heat loss. You set the heat pump as economically as possible to provide the remaining heat. No further adjustments are needed in daily operation.
Both systems are smart enough to complement each other perfectly. The most important principle is this: your ventilation ensures that the heat generated inside the house stays there. As a result, the heat pump simply has to work less and runs very efficiently.
For your ventilation settings, this means you should rely fully on the automatic mode. Just set a low base level and let the humidity sensors in the ventilation unit take care of the rest. The fans will only speed up when really necessary, such as during showering or cooking. This saves the most energy.
For your heating settings, the key to saving money is to keep the heating curve as low as possible. Since you have minimal heat losses, the heating only requires a low flow temperature.
Basically, it’s quite simple. The ventilation runs in automatic mode and ensures minimal heat loss. You set the heat pump as economically as possible to provide the remaining heat. No further adjustments are needed in daily operation.
Hello everyone, I’m jumping in with a question because the discussion here is very relevant for me.
The relationship between the ventilation system’s automatic mode and a low heating curve in winter is very well explained and makes sense to me. But how do these two systems actually work together in summer?
On hot days, I want to use the cool night air to cool down the house. However, the heat recovery ventilation system would work against this by using the warm exhaust air to warm up the cool incoming air from outside. Many decentralized fans have a summer mode or a bypass function for this.
My question is: What is the best way to control this, especially if the heat pump even has a cooling function (active or passive cooling)? Do I have to manually activate the summer bypass on the fans to let the cool night air in? And what happens during the day? Isn’t there a risk that the systems might work against each other – the ventilation system bringing in warm air despite the bypass, and the heat pump then trying to cool it down again?
The relationship between the ventilation system’s automatic mode and a low heating curve in winter is very well explained and makes sense to me. But how do these two systems actually work together in summer?
On hot days, I want to use the cool night air to cool down the house. However, the heat recovery ventilation system would work against this by using the warm exhaust air to warm up the cool incoming air from outside. Many decentralized fans have a summer mode or a bypass function for this.
My question is: What is the best way to control this, especially if the heat pump even has a cooling function (active or passive cooling)? Do I have to manually activate the summer bypass on the fans to let the cool night air in? And what happens during the day? Isn’t there a risk that the systems might work against each other – the ventilation system bringing in warm air despite the bypass, and the heat pump then trying to cool it down again?
At night, when the outdoor temperature drops below the indoor temperature, a modern ventilation system automatically detects this and activates the bypass. This turns off the heat recovery, allowing cool night air to flow into the house to lower the temperature. During this phase, the heat pump's cooling function should definitely be turned off, as the ventilation essentially provides cooling for free.
During the day, the opposite happens. As soon as it gets warmer outside than inside, the system closes the bypass again. The heat recovery then works "in reverse." The hot supply air from outside (e.g., 32°C (90°F)) is pre-cooled by the cooler exhaust air from inside the house (e.g., 24°C (75°F)) before it is supplied. Instead of 32°C (90°F), perhaps only 28°C (82°F) reaches the room. Only then does the heat pump’s cooling activate if necessary. However, it no longer needs to remove all the heat but only the "residual heat," bringing the already pre-cooled air to the desired temperature.
The systems do not work against each other but hand in hand. This saves a lot of energy for active cooling. It is therefore important to trust the ventilation system’s automatic mode and only run the heat pump cooling during the day. Some units also have a summer or winter mode. It might be worth checking the settings.
During the day, the opposite happens. As soon as it gets warmer outside than inside, the system closes the bypass again. The heat recovery then works "in reverse." The hot supply air from outside (e.g., 32°C (90°F)) is pre-cooled by the cooler exhaust air from inside the house (e.g., 24°C (75°F)) before it is supplied. Instead of 32°C (90°F), perhaps only 28°C (82°F) reaches the room. Only then does the heat pump’s cooling activate if necessary. However, it no longer needs to remove all the heat but only the "residual heat," bringing the already pre-cooled air to the desired temperature.
The systems do not work against each other but hand in hand. This saves a lot of energy for active cooling. It is therefore important to trust the ventilation system’s automatic mode and only run the heat pump cooling during the day. Some units also have a summer or winter mode. It might be worth checking the settings.
Wow, if I understand correctly, I don’t need to worry much about the settings in summer or winter?! That’s amazing. From a technical perspective, it’s really impressive how well the systems work together without any direct connection. I wasn’t aware of that before. No wonder heat pumps and ventilation systems are often installed together.
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