Hello everyone,
we are building a KfW 40 house with a Viessmann Vitocal 200-S heat pump and an 8 kW photovoltaic system.
The heat pump is also capable of cooling. The upgrade would cost 1000 € (only the heating installer, thermostats extra).
Is it generally worthwhile to cool using the heat pump? Just because it can does not necessarily mean it is practical.
How fast does a room cool down? Underfloor heating systems are usually quite slow in response.
Or does it make more sense to invest in an air conditioning system and operate it with the photovoltaic system on hot days?
Thanks and best regards
Markus254
we are building a KfW 40 house with a Viessmann Vitocal 200-S heat pump and an 8 kW photovoltaic system.
The heat pump is also capable of cooling. The upgrade would cost 1000 € (only the heating installer, thermostats extra).
Is it generally worthwhile to cool using the heat pump? Just because it can does not necessarily mean it is practical.
How fast does a room cool down? Underfloor heating systems are usually quite slow in response.
Or does it make more sense to invest in an air conditioning system and operate it with the photovoltaic system on hot days?
Thanks and best regards
Markus254
Ypsi aus NI schrieb:
@kati1337
May I ask how much the air conditioning system cost?
Did you build with Viebrockhaus?No, we used a construction company that mainly operates in the northern region. I think we paid about 5,000 for the air conditioning.
The preparation for something like that shouldn’t be underestimated; because of the condensation, sturdy pipes had to be installed through the walls.
kati1337 schrieb:
The preparation for something like this should not be underestimated; due to condensation, sturdy pipes had to be run through the walls This really depends on the situation. Sometimes it’s just a 1m (3 feet) hose that is routed through the roof slope or wall to the outside, depending on the installation location and the unit’s design.
I just spoke with our prospective neighbor yesterday, as he is unsure whether to prepare for air conditioning or not. My advice is: if it’s not completely ruled out that an air conditioning unit might be installed in the future, he should at least plan for the condensate drainage pipes. This only adds a small extra cost but retrofitting later would be much less visually appealing and more complicated. When I removed these items from our offer, the total was roughly 1200 EUR (about 1300 USD) including tax. Depending on the location of your drains, you might even save a few meters of piping.
Y
Ypsi aus NI16 Aug 2021 14:36We are building a KfW 40+ energy-efficient house and definitely want to have air conditioning.
On the ground floor, we would need to cool 60 m² (645 sq ft) of open-plan space and 20 m² (215 sq ft) for a work/bedroom. Upstairs, there are three rooms of 18 m² (194 sq ft) each and one room of 12 m² (129 sq ft). Our builder mentioned costs of around 20,000 to 25,000 for everything. They plan to install one unit per room but would not handle the installation themselves; instead, they would subcontract it. This subcontractor is known for high prices. We have now contacted several companies ourselves and are waiting for quotes. I’m curious to see what they will offer...
For the open-plan area, I would prefer a ceiling air outlet rather than a wall-mounted unit. However, this will probably be difficult or impossible due to the structural design and the thin ceiling construction.
On the ground floor, we would need to cool 60 m² (645 sq ft) of open-plan space and 20 m² (215 sq ft) for a work/bedroom. Upstairs, there are three rooms of 18 m² (194 sq ft) each and one room of 12 m² (129 sq ft). Our builder mentioned costs of around 20,000 to 25,000 for everything. They plan to install one unit per room but would not handle the installation themselves; instead, they would subcontract it. This subcontractor is known for high prices. We have now contacted several companies ourselves and are waiting for quotes. I’m curious to see what they will offer...
For the open-plan area, I would prefer a ceiling air outlet rather than a wall-mounted unit. However, this will probably be difficult or impossible due to the structural design and the thin ceiling construction.
Anything is possible if it is planned early enough. However, for a ceiling cassette, I would rather increase the room height and use a suspended ceiling. This way, you also have excellent space for all kinds of other installations.
For our system of a similar size (but with just standard wall units), we will definitely stay well below 20 K, which also seems to be a good price for the models used compared to any nationwide (internet) providers.
For our system of a similar size (but with just standard wall units), we will definitely stay well below 20 K, which also seems to be a good price for the models used compared to any nationwide (internet) providers.
Y
Ypsi aus NI16 Aug 2021 14:49We have a room height extension, which would basically be negated by installing a suspended ceiling. Let’s see what the detailed planning of the quotes will show...
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