Guides and Documentation

Detailed guides for using the calculators and background information on the standards and calculation methods used.

Available Guides

Heating Load Guide: Formulas & Calculation Fundamentals

Comprehensive guide to heating load calculation according to DIN EN 12831-1, explanation of input parameters, interpretation of results and frequently asked questions.

Air-to-Air Heat Pump: Split Air Conditioning

Comprehensive guide to the air-to-air heat pump calculator with SCOP/SEER calculation according to EN 14825, bivalent operation, economic analysis and best practices.

Solar Guide

Guide to PV system calculation, PVGis data, self-consumption optimization and economic analysis.

Heat Pump Guide

Guide to SPF calculation according to VDI 4650, heat sources, system temperatures and integration with other calculators.

Standards and Norms

All calculations are based on current German and European standards:

DIN EN 12831-1: Heating load for residential buildings
DIN EN 12831-3: Domestic hot water heating
VDI 4650: Seasonal performance factor of heat pumps
VDI 2067: Economic efficiency calculation
GEG 2020: Building Energy Act (Germany)