greenhomesums
Heat pump calculators and BUS grant checks
Running cost vs gas, 15-year total cost of ownership, Boiler Upgrade Scheme eligibility, and MEES-driven retrofits for landlords.
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Air source heat pump cost UK — running cost calculator + is it worth it?
Air source heat pump cost UK: £8,000–£14,000 installed, £7,500 BUS grant available. Calculate running cost vs gas boiler and 15-year total cost of ownership. Updated for 2026.
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Boiler Upgrade Scheme Grant Calculator UK
Check if you qualify for the UK Boiler Upgrade Scheme £7,500 grant for a heat pump — or £5,000 for a biomass boiler — and see your net install cost. Updated for 2026 rules.
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MEES Landlord Compliance Calculator UK
UK landlords: check whether your rental property meets the Minimum Energy Efficiency Standards (EPC C by 2028 / 2030), see the cheapest measure stack to close the gap, and model grants and penalty exposure.
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Octopus Agile Savings Calculator UK
Estimate how much you'd save — or lose — switching to Octopus Agile from a flat tariff, by DNO region. Models load shifting, EV charging and heat pump usage against a typical Agile hourly rate curve.
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EPC Band Upgrade Cost Calculator UK
Homeowner calculator: work out what it would cost to lift your property's EPC from its current band to C, B or A — with the cheapest measure stack, grant offsets, resale-value uplift and green-mortgage savings.
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Holiday-Let EPC Upgrade Calculator UK
Holiday-let operators: cost of upgrading your FHL's EPC to a target band, with grants, occupancy-weighted running-cost saving, comfort-premium revenue uplift, and FHL capital allowance notes.
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Heat Loss Calculator UK — Heat Pump Sizing
Estimate your home's heat loss in kilowatts — the single most important number for sizing an air source heat pump. UK fabric U-values, floor area, glazing and infiltration. Use before getting quotes.
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Octopus Cosy vs Flux Tariff Comparator UK
Side-by-side comparison of Octopus Cosy (heat-pump-tuned), Flux (battery-tuned) and the standard variable. Annual £, peak-window share, export income.