Heat pumps in older buildings – even without a complete renovation

Hessisch Oldendorf, 6 March 2026

There is often scepticism about whether a heat pump works efficiently in an older building. Many people wonder whether it will lead to excessive electricity costs or even keep the house warm at all. Archea New Energy dispels these common myths and shares valuable practical experience from the local area.

Experience clearly shows that a heat pump can operate without any problems even in buildings that have not undergone extensive energy-efficiency improvements. A common question is whether a heat pump can actually keep an older building warm without an enormous amount of renovation work. Practical experience proves that it can. Even at conventional flow temperatures of 55 degrees, reliable results can be achieved, keeping the house warm while reducing energy costs. Concerns about flow temperatures have been disproved in numerous properties where residents are completely satisfied with both the warmth and the costs.

Using a heat pump can roughly halve the original energy consumption. In combination with a photovoltaic system, this requirement can be reduced significantly further, effectively halving the remaining half again. A direct comparison of electricity costs with previous expenditure on oil or gas quickly shows that the investment will pay for itself within a reasonable timeframe. Simply multiplying the price difference provides a clear picture of its cost-effectiveness.

Your opportunity to find out more

Benefit from the thorough planning and many years of experience offered by Archea New Energy to future-proof your existing building. In addition to these insights, further details on this topic can be found in the expert presentation "Practical examples from recent winters in the Weserbergland: heat pumps in existing buildings" for Sunpower at the "haus und energie" trade fair in Hameln.