@swwils Unfortunately they give access to very little data through their app and I have no additional sensors.  I have noticed real-time draw through my battery app of 3.4kW when defrosting - 0.4kW is a typical non-HP load - and 2kW to 2.5kW when working hard, but it may well ramp up beyond that.  Can't say I've ever noticed a 8kW draw.

@andrewj sorry I was giving heat outputs because I have that data. 😂

Again like original poster i wish i had seen this forum. Had a cosy 12 installed last week, think i’m getting divorced!

back ground pump is 3m from my house out front facing across the house. I live in a rural location, lots of trees to my right 4 houses to my left, houses at bottom of close.

i have a top gun unit now blowing air, decimetre says 70 to 75db near unit at bottom, 100db+ at air flow.
We can hear the air flow at the end of the close, its is above 50db at my neighbours front, With double glazing we can hear it in the bedroom.

There is no buzzing internal sounds once the red pump was turned to a 1. So ok on that.

The noise from the fan is driving us wild, i will get complaints from neighbours only a matter of time.

i raised the noise with the fitter ( was his first cosy 12 install) he agreed how loud it was and contacted support, been passed to Northern Ireland, they say they will load new firmware but i don’t know when! I have spoken to a few cosy 12 customers who all have the exact same problem, i believe it is going to be all units. It’s not vibration it is wind noise. 
i can’t have my unit running at night i have to set the temperature to 15 then bang it up after 7am to heat water and house.

octopus are a very good company and sure will sort but so stressful, untold arguments with wife now, house cold in morning costing a fortune as emptying batteries in morning heating up house.

I think octopus should stop installing cosy 12 at present it’s going to ruining a good reputation until they can sort this. It exceeds their 60db but the wind noise is has to be taken into account, fitter got a screen shot of 120db in the airflow!!!

i don’t know what to do, I haven’t paid yet as only installed last week, support know my feelings, technical director knows my feelings, i literally can’t heat house over night so dreading a cold spell, have a 3 year old living hear and i’m old!!!

I was originally have a big Daikin installed but liked the Cosy idea controlled over the air, octopus can service long guarantee etc, so I swapped before install. 

Really don’t know what to do now, should if kept gas!!!

@hook not may they have a big problem going by the wind noise mine makes, no one would accept it! Neighbours are also affected.

during the day you’d just get away with it but in the dead of night can hear mine over 30m away in the road that leads to my close, we stopped the car and opened the window!!!

@l2jad, welcome to the forums, although I’m genuinely sorry it’s under this kind of stress.

What you’re describing doesn’t sound like normal “new system settling in” noise and you’re absolutely right to be concerned, particularly if it’s clearly audible inside the house, at neighbours’ properties and forcing you to shut the system down overnight. That’s ridiculous!

Wind and airflow noise still counts as noise, and if it’s disrupting sleep and day-to-day life, that’s not something you should be expected to tolerate or get used to.

The key thing right now is leverage. If you haven’t paid yet, do not pay. Be polite, factual and calm, but firm stating the system as installed is not fit for purpose. Once payment is made, urgency will disappear, whereas right now Octopus still has a very strong incentive to resolve this properly rather than stringing things out with promises.

It’s also significant that both you and the installer immediately recognised the noise as a problem and that it’s been escalated internally. That undermines any attempt to later frame this as subjective or within expectations. Firmware may or may not help, but until there is a proven, measurable reduction in noise it remains an unresolved fault, not a tweak or optimisation.

Running the system the way you are now, backing it off overnight and then hammering it in the morning, isn’t how a heat pump should operate and will only add stress, cost and frustration, as you’ve already discovered.

That’s not a user error on your part… it’s a consequence of a system you can’t actually live with in its current form. Add in neighbours, a young child and the real risk of complaints, and this goes well beyond inconvenience.

Feeling like “I should have kept gas” is a common reaction when something this disruptive lands in your home, and I see this regularly.

This isn’t a failure of you, and it’s not a verdict on heat pumps as a whole… it’s about whether this particular unit, in this location, is acceptable. I would investigate the option of them replacing this unit that clearly has issues with the Daikin.

Stay firm, keep everything in writing, don’t hand over payment and keep the pressure on for a proper solution rather than reassurances. You’re in the right place here, and you’re not on your own.

Get the Daikin, give them a deadline of 2 weeks.

@editor did you have any luck with TJ on the noise?

I completely feel @l2jad pain. We've been debating all hours how do we unruin our dream house and that of our neighbours. The stress is overwhelming and I don't see the concerns from octopus matching it.

@livinggreen I haven’t. I’ll follow up with TJ this week to see if I can get an update.

I assume you also have the Cosy 12?

@editor thank you Mars that is really sound advice, actually find it reassuring. I  really am so laid back in life, this has just become so stressful. But i am going to continually the chase as we can’t live with this like this. 
i’m using the heat pump as a boiler i can’t cause issues with my neighbours they are friends lived together in this close for 30 years only one change in that whole time!!

i will keep thread informed of any outcomes. The issue was raised by installer as soon as it was powered on, and the following day he came back to see if it had settled, it hadn’t. 

I honestly think octopus will need to stop installing these until they sort this issues, i’m in private contact with 3 other cosy 12 users and everyone has this same outside wind problem noise the 70db + unit noise I can live with. Perhaps if wind noise stops i will actually hear the pump noise? i brought a db meter to measure the noise as phones distort with volume.  
The dead of night no longer exists!!

thank you for your response.

@editor yep cosy 12 too

Noise issues raised at the start of January. Had a firmware update which reduced it from jet engine(!) but still experiencing very much the levels stated by everyone else on this thread. 

@l2jad, honestly, nothing you’ve said sounds unreasonable. When something invades your home like this, especially at night, it cuts straight through accepted tolerance levels. Anyone would be stressed by it, particularly when it risks neighbour relationships. Heat pumps nowadays are quieter than ever, so there’s clearly an issue with this model.

If you’re already in contact with three other Cosy 12 owners experiencing the same noise issue, it would really help if you could encourage them to post here as well, even briefly. Growing numbers matter as do patterns. That collective evidence makes it much easier for me to take this to Octopus as a systemic issue rather than isolated cases.

I agree with you on the wider point too… using a heat pump like a boiler just to survive the noise isn’t acceptable, and it undermines everything heat pumps are meant to do well. Night-time operation is fundamental, not optional. If that’s taken off the table, the system is effectively compromised.

Keep doing exactly what you’re doing: stay factual, keep everything documented, don’t pay and keep us updated. You’re helping more people than you probably realise by speaking up.

@swwils i was going to have a Daikin installed in October, they wanted to stick the 16kwh unit in, my heat loss is only 10.7kw, so i queried the unit size was suggested its to do with having a 300l hot water tank. Looking at specification didn’t look as efficient. 

i like the cosy concept, monitored, updated over the net, can problem solve, service plan etc. octopus installed my ev charger been my supplier for years, i like the company always sorted my problems, like Greg as a CEO.  Just everything pointed to cosy being the best solution for me