ᐅ Additional Cost for Cooling Function in Air-to-Water Heat Pump?

Hello,

we are having a Vaillant Arotherm Split VWL 75/ with uniTower VWL 78/5 IS installed.

I read on the manufacturer's website that the aroTherm split can also be used for cooling with underfloor heating (which we have), provided it is "properly designed."

Unfortunately, I couldn’t find more information. What does "properly designed" mean exactly?

We will definitely ask our contact person about this at the next appointment. I just like to be prepared beforehand to know if it will cause additional costs or what exactly needs to be done.

With another builder, we were once quoted a four-figure additional cost for the cooling function. However, I no longer remember which heating model was supposed to be installed then.

For us, the cooling costs are about €3,500. This is probably mainly due to the thermostats, which simply cost much more.

Proper design can mean anything—from the spacing of the installation to additional components, including the thermostats just mentioned.

If the upgrade costs reach four digits, it is definitely not justified and is simply a rip-off and deceptive practice. The cooling capacity of underfloor heating is only marginal. Provided the house is occupied, this type of cooling is a futile effort.

I completely agree. We are putting the extra cost into a Mitsubishi split air conditioning system with three indoor units. That way, it will at least be cool when needed.

Mycraft schrieb:

Assuming the house is occupied, this type of cooling is a battle against windmills.

You definitely can’t generalize that. Here, we’ve had very good experiences for the second summer in a row. Of course, the blinds on the south side are set to “tilt,” otherwise it wouldn’t work. But the indoor temperature is still about 4 to 5°C (7 to 9°F) lower than outside. That’s very comfortable for us, and we don’t want it any cooler. When you drive to Italy with the car on a 32°C (90°F) day, you don’t set the air conditioning to 18°C (64°F), right? It uses about 1,000 kWh per season, and exactly then when the photovoltaic system produces the most. With the heat pump, it didn’t add any extra cost for us (Rotex HPSU), and I skipped special cooling thermostats. The actuators for the underfloor heating are just loosely hanging in the distribution box anyway, like decoration...

But do you, for example, find the cold tiles in the bathroom uncomfortable? Or does it not make a noticeable difference?