Useful tools
Free calculators to help you size up the savings, costs, and grants on heat pumps, solar, insulation, and more. No sign-up, no jargon.
Heat Pump Savings Calculator
Work out how much you could save each year by switching from gas, oil, LPG or electric heating to a heat pump. Uses Ofgem April 2026 prices and the £7,500 government grant.
Solar Panel ROI Calculator
Work out how much solar panels will save you and how long until they pay for themselves.
Insulation Savings Calculator
See how much each type of insulation could save you. 6 measures ranked with costs, savings, payback periods, DIY product links, and grant eligibility.
Grant Eligibility Checker
Answer a few questions about your home and circumstances to see which energy grants you could claim.
Heat Pump vs Boiler: 15-Year Cost Comparison
See the true total cost of ownership: heat pump vs gas boiler over 15 years. Includes tariff comparison, visual cost curve, and break-even analysis.
EPC Rating Improvement Calculator
See which energy upgrades will improve your EPC rating the most. 11 measures ranked by SAP impact with costs, savings, grants, and product recommendations.