Marion Baeli

“When the BBC visit Baeli on the hottest day of this summer's fourth heatwave, her house is 10C cooler than outside.”

“Baeli estimates energy demand in her retrofitted house has gone down by 88%, giving her a yearly saving of nearly £750 on her bills.”

“The total cost of the work Baeli carried out on her house was around £80,000, not including any additional costs for architectural work.”

“The most expensive purchase, she calculates, were the windows at £30,000, while one of the cheapest measures was making the whole house airtight, which cost £5,000.”