ᐅ New construction with underfloor heating, mechanical ventilation, and air conditioning

Created on: 18 Jan 2022 12:06
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Ramona13
Hello 🙂

First of all, we haven’t planned a floor plan for our future house yet, so we don’t have any idea of the required dimensions. I’m more interested in getting an idea for our wish list.

As mentioned in the title, for the new build we want underfloor heating, a centralized ventilation system, and air conditioning. From what I have read so far, it seems like I would need three separate systems for this... for example, an air-to-water heat pump for regular heating (hot water and underfloor heating), a device for ventilation, and a standalone split air conditioning system (several indoor units), since ventilation alone doesn’t provide real air conditioning. I have also read about cooling through the underfloor heating system, but I imagine that would be uncomfortable, as I usually walk barefoot or wear socks inside the house 😉

Am I on the right track with this approach, or are there good combination units that can cover these functions? Has anyone experienced this setup themselves?

We also plan to install photovoltaic panels on the roof, so electricity consumption is not my primary concern when comparing individual systems versus a combination unit, but rather the space requirements. My server cabinet also needs power and cooling 😎

Thanks and best regards
Ramona
Hangman18 Jan 2022 22:11
Bauenaberwie schrieb:

Can you explain that?

When it comes to the requirement "my house should not overheat," there are many options for demand-based shading: appropriate glass areas, roof overhangs, building recesses, cantilevered elements, full-surface photovoltaic panels on the roof, external blinds/screens, trees, and so on. Only after these options are fully utilized would I consider air conditioning. Not for ideological reasons, but pragmatic ones – if it’s not necessary, I don’t need to plan, buy, or operate it... and it also can’t break down 😉
kati133718 Jan 2022 22:19
Hello!

We built the combination you mentioned back in 2020.
We have a ground source heat pump with integrated ventilation, but a separate air conditioning system with an outdoor unit installed on the carport. After extensive research, this seemed to us the most practical option.
Many people here (those without air conditioning) will likely try to talk you out of installing AC. Personally, I would _definitely_ build with air conditioning again; we have used it a lot and are very happy to have it.
A photovoltaic system goes perfectly with air conditioning. Most of the time when you run the AC, the sun is shining strongly on the roof. 🙂
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Ramona13
18 Jan 2022 22:31
Hangman schrieb:

When it comes to the requirement "my house should not overheat," there are many options for demand-oriented shading: appropriate glass areas, roof overhangs, building projections, attached elements, full-coverage photovoltaic panels on the roof, external blinds/screens, trees, etc. Only when these options are fully utilized would I consider an air conditioning system. Not for ideological reasons, but practical ones – if it’s not necessary, I don’t have to plan for it, buy it, or operate it... and it can’t break down either 😉

I can understand your view, and most people around me think the same. But I know myself well enough to feel I would probably regret more not having something that is complicated to retrofit than the other way around 😉
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Bauenaberwie
18 Jan 2022 22:31
Hangman schrieb:

When it comes to the requirement "my house should not overheat," there are many options for effective shading: well-planned glazed areas, roof overhangs, building projections, canopies, full-surface solar panels on the roof, external blinds/screens, trees, etc. Only once those options have been fully utilized would I consider an air conditioning system. Not for ideological reasons, but for practical ones – if it is not necessary, I don’t need to plan, buy, or operate it... and it also can’t break down 😉

Well, basically you’re right. There are many ways to prevent direct sunlight, but the initial cost of an air conditioning system is only a fraction of the options you mentioned. Especially since, as Kati pointed out, the operating costs are nearly zero due to surplus electricity from the solar panels. In the end, everyone has to decide for themselves 🙂
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Ramona13
18 Jan 2022 22:38
kati1337 schrieb:

We have an air-to-water heat pump with integrated ventilation, but a separate air conditioning system with an outdoor unit mounted on the carport.

Are there special air-to-water heat pumps that can do that? When I searched for ventilation and heat pumps, I always found air-to-air heat pumps instead of air-to-water heat pumps.
kati133718 Jan 2022 23:07
Ramona13 schrieb:

Are those special air-to-water heat pumps that can do this? When I searched for ventilation and heat pumps, I always found air-to-air heat pumps instead of air-to-water heat pumps.

We have a Tecalor THZ 504. Space heating is done through underfloor heating. The ventilation is a separate system, but it is combined in one unit.

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