Simple Home Heating Model

This simple model for heat loss from a house gives you an idea of what proportion of heat loss is through the different elements (walls, windows, roof etc.) and how much you might save if you added insulation or draught proofing. Enter the details of your house below and press 'Run Model' to see what it says about your own house.

Example house heat loss now: 3.1 W/C/m² Help

walls-1 windows-1 door-1 door-2 roof ground floor bridging ventilation
 13%  19%  2%  2%  6%  11%  7%  39%

With changes: 2.3 W/C/m², saves 28%

walls-1 windows-1 door-1 door-2 roof ground floor bridging ventilation
 4%  26%  3%  3%  3%  16%  10%  37%

House Details

First select the general shape of your house:


type:
floors: (excluding converted roof space)
windows:
age (for thermal bridging Help):


Now select the construction features for your house: Help

What it is nowWith changes you are considering
walls-1  
walls-2  
proportion of walls type1:type2
windows-1  
windows-2  
proportion of windows type1:type2
door-1  
door-2  
roof  
ground floor  
ventilation  

Now rerun the model:    


Calculation details

For details of how the calculations have been done see Help.

Details for terraced house 4.9m by 9.9m tfa=97.6

Example house heat loss now

parttypeuvalue/acharea/volumeheat loss w/c
walls-1 Solid brick as built 1.5 27.0 40.5
walls-2 Solid brick as built 1.5 0.0 0.0
windows-1 Double glazed pre 2002 3.1 18.7 57.9
windows-2 Double glazed pre 2002 3.1 0.0 0.0
door-1 Solid wood 3.0 1.9 5.6
door-2 Solid wood 3.0 1.9 5.6
roof 100mm 0.4 48.8 19.5
floor Suspended, no insulation 0.7 48.8 34.2
thermal bridging Pre-2003 0.1 147.0 22.1
ventilation Fairly draughty 1.5 244.0 120.8

Total loss 306.1 W/C

With changes

parttypeuvalue/acharea/volumeheat loss w/c
walls-1 Solid brick with insulation 0.3 27.0 8.1
walls-2 Solid brick as built 1.5 0.0 0.0
windows-1 Double glazed pre 2002 3.1 18.7 57.9
windows-2 Double glazed pre 2002 3.1 0.0 0.0
door-1 Solid wood 3.0 1.9 5.6
door-2 Solid wood 3.0 1.9 5.6
roof 300mm 0.1 48.8 6.3
floor Suspended, no insulation 0.7 48.8 34.2
thermal bridging Pre-2003 0.1 147.0 22.1
ventilation Cosy 1.0 244.0 80.5

Total loss 220.2 W/C