Hello everyone,
maybe someone here can give us a good tip, as we are quite uncertain about a ventilation system.
We are planning to build a house (solid construction) according to KfW 70 standards, with underfloor heating, a fireplace, and a solar system. That much is already decided.
We received an offer from Company A for a ventilation system with heat recovery, and the salesperson recommended it to us.
At Company B, the ventilation system is significantly more expensive, and the salesperson told us that since the house is so well insulated, moisture would not be an issue... where would it come from? The rest could be regulated by normal airing anyway.
(I also think he realized that his ventilation system would have blown our budget and now I worry that he advised us against it just for that reason!)
My husband and I are laypersons, but my instinct tells me that the better the house is insulated, the more problems I would have getting rid of moisture and stale air inside the house, right?
After all, a blower door test does show that there is very little air circulation.
Am I completely wrong?
We are a bit torn now, since such a system is not exactly cheap! But is it necessary, or just a nice extra?
Thank you very much for your help!
maybe someone here can give us a good tip, as we are quite uncertain about a ventilation system.
We are planning to build a house (solid construction) according to KfW 70 standards, with underfloor heating, a fireplace, and a solar system. That much is already decided.
We received an offer from Company A for a ventilation system with heat recovery, and the salesperson recommended it to us.
At Company B, the ventilation system is significantly more expensive, and the salesperson told us that since the house is so well insulated, moisture would not be an issue... where would it come from? The rest could be regulated by normal airing anyway.
(I also think he realized that his ventilation system would have blown our budget and now I worry that he advised us against it just for that reason!)
My husband and I are laypersons, but my instinct tells me that the better the house is insulated, the more problems I would have getting rid of moisture and stale air inside the house, right?
After all, a blower door test does show that there is very little air circulation.
Am I completely wrong?
We are a bit torn now, since such a system is not exactly cheap! But is it necessary, or just a nice extra?
Thank you very much for your help!
I also see many advantages in a controlled residential ventilation system.
However, you shouldn’t overlook the drawbacks of such a system.
It has more disadvantages than just the initial investment costs.
If you are expecting energy savings, you should calculate when the system will pay for itself.
However, you shouldn’t overlook the drawbacks of such a system.
It has more disadvantages than just the initial investment costs.
If you are expecting energy savings, you should calculate when the system will pay for itself.
D
DerBjoern30 Apr 2014 13:30What disadvantages are you referring to?
A centralized mechanical ventilation system with heat recovery requires maintenance. The costs for filter replacement are still manageable but should not be overlooked.
However, what many do not plan for are inspection openings to clean the air ducts. After several years, the inside of these ducts does not look very appealing.
A mechanical ventilation system with heat recovery is not worthwhile for energy savings. The initial investment costs are too high for that.
However, what many do not plan for are inspection openings to clean the air ducts. After several years, the inside of these ducts does not look very appealing.
A mechanical ventilation system with heat recovery is not worthwhile for energy savings. The initial investment costs are too high for that.
D
DerBjoern30 Apr 2014 13:44As I have already mentioned, apart from the costs, there are no disadvantages.
DerBjoern schrieb:
As I already mentioned, apart from costs, there are no disadvantages That is correct. Conversely, the points I mentioned translate into costs.
D
DerBjoern30 Apr 2014 13:59Maintenance costs can vary. On one hand, I can have a maintenance contract that includes filter replacement; on the other hand, I can buy the filters locally, purchase them cheaply online, or even order filter material by the meter at a low cost.
If you equip the supply air outlets with filter-equipped flap valves in addition to the filters in the system, the ducts will hardly get dirty at all.
Otherwise, of course, there is a range of options for duct cleaning. You can either hire a company to do it, or you can pull a cleaning brush with a snake cable through the ducts yourself (similar to chimney sweeping).
Basically, it’s a pure matter of money whether you want to invest in an expensive system or simply install one or two exhaust fans along with trickle vents in the window frame.
The maintenance costs of a controlled ventilation system with heat recovery are easily offset by the energy savings. However, in my opinion, the energy savings alone are not enough to ever pay off the initial investment.
If you equip the supply air outlets with filter-equipped flap valves in addition to the filters in the system, the ducts will hardly get dirty at all.
Otherwise, of course, there is a range of options for duct cleaning. You can either hire a company to do it, or you can pull a cleaning brush with a snake cable through the ducts yourself (similar to chimney sweeping).
Basically, it’s a pure matter of money whether you want to invest in an expensive system or simply install one or two exhaust fans along with trickle vents in the window frame.
The maintenance costs of a controlled ventilation system with heat recovery are easily offset by the energy savings. However, in my opinion, the energy savings alone are not enough to ever pay off the initial investment.
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