Save energy.
Reduce costs.
Calculate how much you can save on home renovations - with a calculator developed by Arvio.
Energy calculator
Calculate how different renovation measures affect your home's energy consumption and heating costs.
Open calculator →Energy saving tips
Practical tips for reducing energy consumption - from simple habit changes to larger renovation investments.
Read tips →Home renovation
Information about investments in heat pumps, windows and facades, and how these investments reduce costs in the long run.
Learn more →Sources: SURS and ODYSSEE-MURE (consumption), SURS Census of Dwellings (building age), Eko sklad and the EPBD directive (savings from deep renovation).
Who this site is for
It is aimed at owners of houses and flats who are considering an energy renovation, or who have been caught out by a high heating bill. It is not written for specialists - we aim for content that makes sense without any background in building physics, while citing our sources so you can check every claim yourself.
If you are at the very beginning and unsure where to start, we suggest this order: first use the calculator to see where your house stands today and which measures contribute most; then read the guidance on what to watch out for with your chosen measure and what subsidies currently apply; and if a question remains after that, write to us.
What you will find here
- An indicative calculation of annual consumption, energy class and heating costs for your house - before and after renovation, with the methodology published in full.
- Guidance on individual measures - heat pumps, facade and roof insulation, window replacement, solar power - including indicative costs and payback periods.
- Current Eko sklad subsidy terms, which we update whenever a new public call is published.
- A free answer to your question about your specific situation, independent of any contractor.
Everything here is free and requires no registration. We do not sell equipment, broker contractors or receive commissions - more about how we operate.
Our mission
The Society for Responsible Energy Use educates the public about energy efficiency and helps households make informed decisions about home renovation and reducing energy consumption.
technology
Start with your own house
In a few minutes, find out which renovation measures cut your energy use and annual heating costs the most. The tool is free and requires no registration.