Heat load, bathroom costs, cooling capacity, funding, economics, photovoltaics – honest guide values for your house in Giessen and Central Hesse.
Pick a calculator. You will then see only that one – with a result in two to three minutes and, if you like, by email or callback.
How much heating capacity does your house really need? From living space, year of construction and building type we estimate the heat load and show which systems fit – with a cost range.
For anyone planning a new heating or heat pump Open calculatorBasic subsidy, climate bonus, income bonus: in five steps you see your funding rate after the 2026 BEG reform and your own share.
For heating replacement and heat pumps Open calculatorIs switching worth it? We compare your current heating costs with a heat pump, hybrid or pellet system and calculate savings and payback.
For everyone who wants numbers instead of promises Open calculatorComplete bathroom, partial renovation or just new fittings? The calculator gives a realistic cost range and the expected construction time.
For bathroom planners with a budget question Open calculatorWhat cooling capacity does your room need? Area, sun, insulation and use give the right unit class – including costs for unit and installation.
For flats, houses and offices Open calculatorHow much electricity will your roof deliver? Area, orientation and pitch give yield, self-consumption and payback – with or without storage.
For homeowners with a free roof Open calculatorCalculate heating load & system recommendation
Please review your entries and continue.
Plan a bathroom renovation & understand the costs
Calculate cooling capacity & AC system
Funding figures as of October 2026 (BEG, KfW programme 458). Rates change regularly – we check them before every quote.
Heating funding (KfW 458) after the BEG reform of 21 July 2026 – four steps to your funding rate
Relevant is the taxable income of all household members, averaged over the second and third year before the application. Income and climate bonus are only available to owner-occupiers.
Is modernisation worthwhile?
Photovoltaics: yield & profitability
Talk to us — we are happy to advise you personally and without obligation.
