Country
Language
The HACKS calculator reviews the current energy set up at your home and provides solutions to make your home more energy efficient

Not sure on where to start on your energy efficiency journey? Don't worry, our online calculator is here to help. The calculator will ask you a series of questions about the energy set up at your home and determine the best solutions for you. The results are based on real-world data

Your energy summary

  • C8 Actual efficiency of the heating system
  • C13 Amount of hot water used per year
    litres
  • C14 Annual hot water energy consumption
    kWh
  • E23 Total annual energy consumption
    Actual energy consumption for heating and hot water kWh
  • G23 Annual costs
    £
  • I23 Annual CO₂ emissions
    t CO₂
  • C36 Annual fuel energy consumption to heat home (per square metre)
    This is the energy that your heating system needs going into it kWh/m²*y
  • C37 Annual energy requirements to heat home (per square metre)
    This is the energy that your heating system puts into your home kWh/m²*y
  • C38 Assumed energy efficiency level (A-G)
    On a scale of A-G, A is the most efficient (not EPC)
  • C39 Solar energy

Household data

m²
If you have it, this can be found on your EPC certificate. Typical values are a) detached four bed 150m2 b) semi detached 90m2 c) terraced 80m2
Field required
Please select North if you live in Scotland and South if you live in the rest of the UK
Field required
Field required
Years
Field required
For example, underfloor heating or radiators
Field required
Field required
People
Field required

Your annual energy consumption

An estimate of this can be found on your bill
kWh
Field required
£/unit
Field required
g CO₂/kWh
Field required
£/kWh
m³
Field required
£/unit
Field required
g CO₂/kWh
Field required
£/kWh
litres
Field required
£/unit
Field required
g CO₂/kWh
Field required
£/kWh
m³
Field required
£/unit
Field required
g CO₂/kWh
Field required
£/kWh
kg
Field required
£/unit
Field required
g CO₂/kWh
Field required
£/kWh
kg
Field required
£/unit
Field required
g CO₂/kWh
Field required
£/kWh

Choosing your new heating system







Choosing energy efficiency measures




Lifetime of the new heating system

Years
For example, the typical lifetime of a new heating system is 10-20 years
Field required

Your results

Actual system E26 Air-to-air heat pump E27 Air-to-water heat pump E28 Ground source heat pump E29 Condensing gas boiler E30 Condensing oil boiler E31 Pellet stove E32 Wood stove
D51 Your current energy consumption
kWh/year		 ● ● ● ● ● ● ●
D52 Actual energy requirements for heating
(the amount of energy needed to heat your home)
kWh/year		 ● ● ● ● ● ● ●
D53 Actual costs
£/year		 ● ● ● ● ● ● ●
D54 Actual CO₂ emissions
t CO₂/year		 ● ● ● ● ● ● ●
D55 Energy saving from new home insulation measures ●
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
D57 Estimated energy consumption
(this is the amount you would see on your energy bills) - for the selected option		 ●
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
D56 Energy required after new home insulation measures ●
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
kWh/year
D58 Total annual cost ●
£/year
£/year
£/year
£/year
£/year
£/year
£/year
D59 Total CO₂ emissions ●
t CO₂/year
t CO₂/year
t CO₂/year
t CO₂/year
t CO₂/year
t CO₂/year
t CO₂/year
D60 Annual cost savings ● (%)
£/%		 (%)
£/%		 (%)
£/%		 (%)
£/%		 (%)
£/%		 (%)
£/%		 (%)
£/%
D61 Annual CO₂ emission savings ● (%)
t CO₂/year		 (%)
t CO₂/year		 (%)
t CO₂/year		 (%)
t CO₂/year		 (%)
t CO₂/year		 (%)
t CO₂/year		 (%)
t CO₂/year
D62 Equivalent CO₂ emissions saved (driving car) ●
km/year by car
km/year by car
km/year by car
km/year by car
km/year by car
km/year by car
km/year by car
D63 Lifetime cost savings ●
£
£
£
£
£
£
£
D64 Lifetime CO₂ emissions ●
t CO₂
t CO₂
t CO₂
t CO₂
t CO₂
t CO₂
t CO₂
D65 Lifetime CO₂ savings ●
t CO₂
t CO₂
t CO₂
t CO₂
t CO₂
t CO₂
t CO₂
D66 Lifetime equivalent CO₂ emissions saved (driving car) ●
km by car
km by car
km by car
km by car
km by car
km by car
km by car