Hello community,
Has anyone installed or is planning to install this system?
I find the possibility to cool with the indoor units during summer quite interesting!
However, with a maximum supply temperature of 35°C (95°F), I have concerns that the two offered indoor units will run 24/7 during winter and, with the increased power consumption, whether the guaranteed annual performance factor of 5 will be achieved.
Detailed answers would be great!
Regards
Has anyone installed or is planning to install this system?
I find the possibility to cool with the indoor units during summer quite interesting!
However, with a maximum supply temperature of 35°C (95°F), I have concerns that the two offered indoor units will run 24/7 during winter and, with the increased power consumption, whether the guaranteed annual performance factor of 5 will be achieved.
Detailed answers would be great!
Regards
Hi,
your concerns about combining heating and cooling are completely justified. The stated seasonal performance factor often sounds better than it actually is because the values are measured under ideal conditions. With only 35°C (95°F) supply temperature, the efficiency heavily depends on insulation and heating surfaces – two indoor units can quickly reach their limits.
Many manufacturers tend to be a bit optimistic with their test conditions. As soon as it gets really cold outside, the coefficient of performance (COP) drops and electricity consumption rises. Have you already had the heating load calculation properly checked, or was it more of an estimate?
Be careful with cooling as well: without a correct dew point adjustment, condensate can cause moisture problems. Also, make sure whether the manufacturer even approves continuous operation during frost – otherwise, the actual seasonal performance factor will be significantly worse.
Good luck!
your concerns about combining heating and cooling are completely justified. The stated seasonal performance factor often sounds better than it actually is because the values are measured under ideal conditions. With only 35°C (95°F) supply temperature, the efficiency heavily depends on insulation and heating surfaces – two indoor units can quickly reach their limits.
Many manufacturers tend to be a bit optimistic with their test conditions. As soon as it gets really cold outside, the coefficient of performance (COP) drops and electricity consumption rises. Have you already had the heating load calculation properly checked, or was it more of an estimate?
Be careful with cooling as well: without a correct dew point adjustment, condensate can cause moisture problems. Also, make sure whether the manufacturer even approves continuous operation during frost – otherwise, the actual seasonal performance factor will be significantly worse.
Good luck!
N
nordanney13 Nov 2025 08:10Kollo100 schrieb:
However, I have a maximum flow temperature of 35°C (95°F), If I’m not mistaken, these have a maximum flow temperature of around 60°C (140°F). The 35°C (95°F) figure refers only to the energy efficiency rating. This is a standard heat pump (for heating), with the addition that the outdoor unit also operates air conditioning units. Panasonic offers something similar.
I hope you plan to install traditional underfloor heating and not rely on the air conditioning units for heating. Otherwise, you will need an indoor unit for each room, which can cause drafts.
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