Hello,
We have an air-to-water heat pump from Ochsner (Air Basic 211 C11B ELW8).
Especially when it gets cold, but also at other times, we have a serious noise problem. When the heat pump runs at high power, we hear a humming/buzzing throughout the entire house. Whether in the bathroom and bedroom on the opposite side of the house, the living room, or the basement — it resonates everywhere.
The outdoor unit with the condenser is installed on a concrete base on the roof of the garage attached to the house. The outdoor unit is located directly in front of a 2 x 1.50-meter (6.5 x 5 feet) window as well as in front of a child’s room with a window facing the heat pump.
We’re at a loss right now. Customer service was on-site—technically, the unit is fine. The heat pump is placed on rubber mats to avoid structure-borne noise transmission. However, I suspect this isn’t working very well. The noise is probably a mix of airborne and structure-borne sound.
Either we freeze now or can’t sleep due to the extremely loud humming.
Does anyone have any advice (elevating the unit? Acoustic cover?)? I have turned the heating curve down significantly so the heat pump doesn’t have to work as much, which has improved the situation slightly.
We bought the house, not built it. So far, installers have only suggested relocating the unit, but that would cost up to €10,000.
I hope someone has experience with this.
Thanks a lot for your help.
We have an air-to-water heat pump from Ochsner (Air Basic 211 C11B ELW8).
Especially when it gets cold, but also at other times, we have a serious noise problem. When the heat pump runs at high power, we hear a humming/buzzing throughout the entire house. Whether in the bathroom and bedroom on the opposite side of the house, the living room, or the basement — it resonates everywhere.
The outdoor unit with the condenser is installed on a concrete base on the roof of the garage attached to the house. The outdoor unit is located directly in front of a 2 x 1.50-meter (6.5 x 5 feet) window as well as in front of a child’s room with a window facing the heat pump.
We’re at a loss right now. Customer service was on-site—technically, the unit is fine. The heat pump is placed on rubber mats to avoid structure-borne noise transmission. However, I suspect this isn’t working very well. The noise is probably a mix of airborne and structure-borne sound.
Either we freeze now or can’t sleep due to the extremely loud humming.
Does anyone have any advice (elevating the unit? Acoustic cover?)? I have turned the heating curve down significantly so the heat pump doesn’t have to work as much, which has improved the situation slightly.
We bought the house, not built it. So far, installers have only suggested relocating the unit, but that would cost up to €10,000.
I hope someone has experience with this.
Thanks a lot for your help.
Nanoneo schrieb:
The house was built in 2019; I cannot say whether the seller was aware of this. If he heated the house, he must have noticed it. Was this communicated? No. Then one could say that he failed to transparently disclose the defect of the house. Do you know where he moved to? I mean, was the stated reason for selling understandable? Could the defect of the house have been the reason for the sale?
H
HilfeHilfe15 Jan 2024 06:19What exactly do you mean by defect? Noise is often subjective. We had the same problem with the neighbors. When the first harsh winter came and the air source heat pump ran like a tractor, they complained. However, it was still within acceptable limits. What we did, without reducing performance, was to slightly break up the sound. We installed perforated metal sheets on the sides and front. Everything improved.
B
Benutzer 100115 Jan 2024 09:15In front of a window, sorry, that’s very naive... the only solution is to move the thing. You should carefully consider where to place it, but since you are on site, you have the overview. For your information, 20 meters (65 feet) is usually easily possible, and that would be worth it to me.
I believe this is overall a very unfortunate situation.
a) Location (too close and in front of the window – unpleasant)
b) Installation situation: heat pump on a concrete base vibrates,
possibly even matching the natural frequency of the garage roof.
Additionally, the garage or the garage roof is poorly or not at all decoupled from the house.
Who plans such things? With common sense, these issues are hard to justify.
P.S. I was annoyed for over a year by my domestic water pump, which the plumber had rudimentarily mounted decoupled on the wrong wall (against prior agreement). As a result, it always caused unpleasant noise in the bathroom when water was used (toilet flush, outdoor faucet).
With about 3 hours of work and around 30€ of materials, I combined plywood panels, hard rubber mats, and soft rubber mats, and now the system is almost silent (it was only structure-borne noise).
Maybe you can try something similar (the heat pump is, of course, much heavier than a domestic water pump) by placing different rubber mats under the concrete base of the heat pump to decouple it from the roof?
a) Location (too close and in front of the window – unpleasant)
b) Installation situation: heat pump on a concrete base vibrates,
possibly even matching the natural frequency of the garage roof.
Additionally, the garage or the garage roof is poorly or not at all decoupled from the house.
Who plans such things? With common sense, these issues are hard to justify.
P.S. I was annoyed for over a year by my domestic water pump, which the plumber had rudimentarily mounted decoupled on the wrong wall (against prior agreement). As a result, it always caused unpleasant noise in the bathroom when water was used (toilet flush, outdoor faucet).
With about 3 hours of work and around 30€ of materials, I combined plywood panels, hard rubber mats, and soft rubber mats, and now the system is almost silent (it was only structure-borne noise).
Maybe you can try something similar (the heat pump is, of course, much heavier than a domestic water pump) by placing different rubber mats under the concrete base of the heat pump to decouple it from the roof?
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