The Heat Pump Year Total 2023 Carbon Footprint: 4.8 tonnes CO2e Down 21% from 2022, 61% below 2019 baseline. Breakthrough: Home Energy First full year with heat pump showed dramatic results: Category 2023 2022 Change Flights 2.2 2.4 -8% Home Energy 1.4 2.6 -46% Ground Transport 1.0 0.9 +11% Purchases 0.2 0.2 0% Heat Pump Impact Moving from gas boiler to heat pump: Reduced home emissions by 1.2 tonnes Heating cost roughly equivalent (with renewable tariff) Comfort level maintained or improved Payback period: 8-10 years estimated Key learning: Technology changes can deliver sustained reductions where behaviour change plateaus.