Know what you need — before the installer shows up.
Your situation, honestly calculated. No sales pitches.
Honest savings calculations, subsidies and technical advice — in one report.
Know what you need before you talk to installers. 15 min · €90.
- 15 minutes to complete
- Independent — €0 commission
- Comprehensive personal advice
Two scenarios. One choice.
What happens when you talk to installers informed — or not?
Without an independent report
You call three installers. They visit, measure your roof, and each gives a different proposal:
Result:
You have no idea who’s right. You don’t know if your roof fits 16 panels. You don’t know if a battery pays off with your usage. You sign with the best salesperson — not the best solution.
With a DoctorSun report
Before you call a single installer, you have:
Result:
You know exactly what you need. You compare quotes on facts. You miss no subsidy. The installer knows you’re informed.
Investment: 15 minutes + €90
Savings: thousands of euros over the lifetime
What’s in your report?
9 pages of independent advice — everything you need before requesting a quote.
Savings calculation
Based on your actual kWh and gas consumption. No assumptions, your real numbers.
Installation sizing
How many panels, what battery capacity, which heat pump — tailored to your home.
25-year cashflow
Year-by-year overview with inflation, subsidies and the exact breakeven moment.
Subsidy overview
IRPF (20–60%), IBI discount, Next Generation EU and provincial schemes — with calculated amounts.
Installer checklist
12 points to compare quotes. Ask the right questions and recognise a good offer.
Action plan + timeline
Which steps, in what order, with a monthly schedule spanning 6+ months.
How we work
No window dressing, no sales rush.
We listen
Tell us about your home, your bill and your goals. 10 questions in 3 minutes.
We diagnose
We cross-reference climate data, consumption and 2030 rules. No sales algorithms.
We prescribe
Exactly what your home needs — and in the right order. If nothing is needed, we say so.
Spaniards and Dutch with one mission
Our team consists of engineers, energy advisors and property experts — Spaniards and Dutch — who chose to advise consumers and businesses on making their home or building more sustainable.
We sell no panels, no batteries, no heat pumps. We are not paid by installers. That makes us the only party at the table who truly advises in your interest.
The choices go far beyond what you think
Property value
By 2030 your energy label partly determines your sale price. Label D–G can mean thousands less on sale or rental.
Solar vs. insulation
Sometimes insulating first is smarter than installing panels straight away. We calculate the optimal order for your situation.
2030 deadline
The EU directive (EPBD) requires the worst energy labels to be addressed. Not acting has consequences for your wallet.
Subsidies you’re missing
IRPF deduction, IBI discount, Next Generation EU, provincial funds — up to €8,000 you’d otherwise leave on the table.
Gas vs. electricity
Switching from gas to a heat pump? We calculate whether it truly pays off for your usage pattern — or not.
Payback period
Not every system pays for itself in 6 years. We show you the honest numbers: 10, 15 or 25 years — including inflation.
“We sell no panels. We’re not paid by installers. Our only product is honest advice.”
What we diagnose
Not a catalogue, a full check.
Solar map of Spain
Click your province for a local diagnosis
“Finally someone who doesn't want to sell me panels, but honestly tells me what my house needs.”
