@ The primary energy factors are the current ones and must be used as the basis for every thermal insulation and heat load verification. When it comes to the values from BAFA, a distinction must be made between heating value and calorific value, which is also correct. However, energy consultations may also change usage conditions. That means private law is not the same as public law. For both, no electricity mix may be applied for heat pumps; this has been set to zero by policy. And with an annual performance factor of 2, where do you stand? Regarding optimistic annual performance factor values, you can refer to the Fraunhofer study. What really comes out of it, you can see on YT with the "Energiesparkommissar." "Zukunft Altbau" one month ago for energy consultants. The storage of hydrogen is far too expensive and thus, like e-cars, only a luxury for many. Ultimately, everything will be relativized by the electricity price, because the average consumer does not have five- to six-figure savings. And that is why it is important that modern heat pump systems are used and not every slow seller still goes away at double the price as now. Photovoltaics and battery storage do not need to be mentioned anymore at present, unless you already have a Rolex on your wrist and a Porsche as a second car. However, they also contribute far too little to heating and are thus, even for the KfW efficiency house, out of funding now.