ᐅ Retrofitting an air conditioning system – will that affect KfW funding?

Good evening everyone,

Since October, we have been living in a prefabricated house built by Hanse Haus. We have been living here for about 5 months now and are very pleased.

However, at the moment, the indoor temperature in each room is between 26°C and 28°C (79°F and 82°F), even though it is similarly warm outside. The only way we can lower the temperature is by opening the windows at night.

We have a KFW55 standard and a Stiebel Eltron LWZ 5s Plus. Unfortunately, it does not have an active cooling function, but we have installed and activated the summer cassette in the menu settings. So far, this has not produced the desired result. The temperature remains the same.

We are now considering adding air conditioning, but we have been clearly advised that this might mean no longer meeting the KFW energy-saving regulation standards, and therefore, it might affect the eligibility for subsidies. Fortunately, it is not very hot outside at the moment, but when it reaches 35°C (95°F) outdoors, the temperature inside the house can easily rise to around 30°C (86°F), which is not exactly comfortable.

Does anyone have advice or experience with retrofitting air conditioning (in specific rooms) or with the same heating system?

Thanks & best regards
Helado

Here we were clearly warned.

But who exactly are "they"? Hanse? Of course, they won’t help you commit subsidy fraud by undermining your certified KfW-40 status. If anything, you should look for a different accomplice for that.

As a layperson who has not used KfW funding, I wonder what climate has to do with KfW. Does household electricity consumption also count towards the primary energy demand, which, as far as I understand, is crucial for the classification?

They are probably concerned about losing airtightness. Otherwise, it is indeed the case that you must maintain the KfW standard for 10 years. If you deviate during this period (due to remodeling or a different heating system), you would have to repay the subsidy.

nordanney schrieb:

They are probably concerned that airtightness will be compromised.
Otherwise, it is indeed the case that you must maintain the KfW standard for 10 years. If you deviate during that time (due to renovations or a different heating system), you would have to repay the subsidy.

Okay. Understood. So what is different with a controlled residential ventilation system? I’m really interested.

Where there is no complainant, there is no judge.

I don’t have a KfW loan myself, but several people here in the forum do. Surely that will never be noticed..