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Retrofit plans
Heating demand calculations
Heating demand calculations
Progressive heat loss calculations
2019 (SAP 10.1) tCO2
Current EPC
Predicted EPC
Current carbon
Predicted carbon
Current heating
Predicted heating costs
kWh/m²
Predicted kWh/m²
Heat loss coefficient
Heat pump size in KW
1
Remove secondary heaters - gas
69.95 C
71.78 C
3.759
3.494
£739.95
£696.12
94.77
93.5
326.1
8
2
Block open chimneys
69.95 C
72.41 C
3.759
3.426
£739.95
£684.86
94.77
91.21
316.7
8
3
Insulated floors (50mm) from 1967-1975 suspended timber floor
69.95 C
74.26 C
3.759
3.143
£739.95
£637.90
94.77
81.66
286.9
7
4
300mm loft insulation from 250mm
69.95 C
74.38 C
3.759
3.123
£739.95
£634.65
94.77
81
284.9
7
5
Humidity controlled kitchen extractor
69.95 C
74.38 C
3.759
3.123
£739.95
£634.65
94.77
81
284.9
7
6
Humidity controlled extractors per wetroom
69.95 C
74.38 C
3.759
3.123
£739.95
£634.65
94.77
81
284.9
7
7
Humidity controlled passive ventilation to non-wet rooms
69.95 C
74.38 C
3.759
3.123
£739.95
£634.65
94.77
81
284.9
7
8
Install PV system where potential has been identified
69.95 C
84.15 B
3.759
2.554
£739.95
£634.65
94.77
81
284.9
7
9
GSHP with existing radiator central heating and hot water, from A rated gas boiler #2
69.95 C
84.84 B
3.759
0.642
£739.95
£622.99
94.77
91.28
284.9
7
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