After 21 years in the energy industry, I've seen thousands of homes — and the same mistakes come up over and over.

1. Thermostat at 21°C "because that's comfortable"

Every degree above 19°C costs you roughly 6-7% more on heating. Most people can drop to 19.5°C and feel zero difference — especially with proper insulation. That's €100-200/year back in your pocket.

2. Ignoring the CV-ketel maintenance

Your boiler loses 5-15% efficiency per year without servicing. A €100-150 annual service pays for itself in 2-3 months of lower gas usage. Yet most people wait until it breaks.

3. Thinking solar panels are "too expensive now"

The payback period for a standard 10-panel setup in the Netherlands is currently 5-7 years. With panels lasting 25+ years, that's 18+ years of free electricity. The math hasn't changed — it's still one of the best investments a homeowner can make.

These are the kinds of insights we share with our Energieadvies Pro members every month. Real advice, no fluff, from people who've actually installed and maintained these systems.