Energy efficiency

Hello,

I am still a novice when it comes to building a house.
And therefore I would like to have some factors clarified in advance:

My partner and I are facing the choice: build or buy?

A new house would have an energy efficiency of 49 Kwh/m².
An old building would have about 250 Kwh/m².

I need a usable formula with which I can compare oil, gas, and heat pump against each other.
How much electricity does the heat pump need per year, how many liters of heating oil, and how many cm³ of gas.

Only when I can calculate the energy costs of different houses can I also calculate the amortization period and estimate a monthly installment.
Tendency now new build! (The only thing that bothers me massively are the high building plot prices 105€/qm² [TE]).

Regards

Hello,

If 105€/sqm already seems high to you, you should come by our place in BY/Munich metropolitan area.....
That's a good price for a developed plot. We ourselves got a bargain at 120€ in our opinion.

Regards
Joe

Hello Doerbecker,

the property is only partially developed (TE)!
And I am not building in Munich but in a small village in the Westerwald. Unfortunately, there are massive fluctuations depending on the location from €40 - €120/m².
But the €40 are in areas where the dog is buried, there the real estate prices are also in the basement when it comes to existing buildings.

But does anyone have an answer to my actual question on how I can convert the energy costs/m²?

Euro definitely has an answer for you:D

Hello Gintonik,

as you said, you are still in the early stages when it comes to building a house, so hardly anyone in the forum can answer the question. Let's start with the question of building or buying.

Building (new construction)
Advantages: individuality possible, energy standard and energy system freely selectable depending on budget
Disadvantages: possibly long planning and construction time, cost risk

Buying (new construction)
Advantages: high cost certainty, quick move-in possible
Disadvantage: often standard concepts, limited choice in energy standard and systems, little influence on layout

Basically, I would exclude oil from the three energy sources you mentioned, even though some still see prospects in it.

For gas and heat pumps, among other things, the energy standard and investment costs play a role. A gas condensing boiler is, if a gas connection is possible, relatively simple and realizable with a manageable budget. For a heat pump, we are talking about a factor of 2 to 3.

The goal should be a reasonable building physics standard below the requirement value of the Energy Saving Ordinance 2013, since your property is to be seen as an investment and will have to compete with plus-energy houses in a few years. Therefore, solar support and, if applicable, own electricity generation using a mini- or micro-combined heat and power plant also make sense. This brings us to the question of how user behavior and equipment should look like? How many users, swimming pool planned, electric car or electric scooter conceivable, etc.

Best regards, Erik

.... A new house would have an energy efficiency of 49Kwh/m². An old building would have about 250Kwh/m²....

... How much electricity does the heat pump need per year, how many liters of heating oil and how many cm³ of gas...

No one can reliably answer that question. Furthermore, the preparation of hot water also plays a certain role. The efficiency is also significantly determined by the achievable system performance factor. Brine heat pumps reach 0.23; air heat pumps 0.29; and gas condensing boilers 1.2, each assuming careful system planning and dimensioning. Generally: the lower the energy demand, the higher the investment costs!

... Only when I can offset the energy costs of different houses can I also calculate the payback period and a monthly installment.

Hardly, because for this the actual demand (capacity, energy) for heating and hot water would have to be known in each case. Moreover, amortization for owner-occupied buildings never occurs (business administration)! In new builds, there are all possibilities to coordinate all influencing factors and components depending on the budget. In existing buildings, many risks are present, the selling price often too high, and ultimately, more or less significant compromises must be expected (exception, if a complete renovation is possible). @ Erik: 2..3 times as high is probably a joke. An air heat pump or brine heat pump with trench collector costs less in investment than a gas condensing boiler when connection costs and usually required solar thermal systems are taken into account.

v.g