CalculHouse
Calculators · Comparisons · Guides

Tools that make decisions simple

CalculHouse brings together free calculators, assessment tools and comparison tables — get a clear answer in a few clicks, no sign-up.
Start a calculationSee all tools
  • Free
  • No sign-up
  • Method and sources published
  • Independent
How it works

A clear, numbers-based answer in three steps

  • Answer a few questions
    Simple questions, no jargon. No account needed.
  • Get a quantified result
    A clear estimate, with the full calculation and its margin of uncertainty.
  • Compare suitable equipment
    The models that fit your result, on criteria you can check.
Catalogue

Our tools

Each tool answers one specific decision.
Power dial showing a 10 to 13 kW range at ± 15 %, above a water surface
Pool
What power for your pool heat pump?
Size your pool heat pump in 5 questions — instant, personalised result.
  • 2 min
  • 5 questions
  • Range in kW
Guides

Further reading

In-depth analyses alongside the tools, for when you want to dig deeper.
All guides
Bar chart comparing 9 kW advertised with 6.4 kW measured, a −29 % gap
Pool
Pool heat pump: 9 kW advertised, 6.4 kW real in shoulder season
A survey of 10 spec sheets: ‑29 % on average between the advertised power and the power at 15 °C.
  • 14 min read
  • 10 models compared
Method

Numbers you can check

Every tool publishes its method: formulas, coefficients and sources. You know where the result comes from — and when to ask a professional.
Documented calculations
Formulas and coefficients are detailed below each tool.
Sources cited
Standards, spec sheets and reference studies, linked at the end of the page.
Independent results
Merchant links never influence a result: models are ranked by what you need.

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