heatloss.js example
See linked resources at the bottom for more information on how to use this tool
How to use this tool
Example calculation and discussion:
A mid terraced house
This tool is based on the BS EN 12831:2003 heat loss calculation standard:
Room by room heat loss using MCS heat pump calculator
There are a number of useful resources available on the MCS installer standards and tools page (see under Heat pump section), including U-value and heat emitter guides:
MCS installer standards and tools
MCS Guidance on U-Values from Domestic Heating Design Guide
To generate a more accurate degree-days value for your location see:
https://www.degreedays.net/
This tool is open source and free to use, the source code is available on github:
https://github.com/trystanlea/heatlossjs
You may also be interested in SAPjs, a tool for household energy assessment based on SAP 2012:
https://openenergymonitor.org/sapjs