🧠 Understanding U-Values

• 🏠 Walls: Solid walls and PRC types are heat losers unless insulated.
• 🪟 Windows: Old single glazing leaks energy like mad. Triple is tight.
• 🏠 Roofs: Loft insulation is your cheapest win – max it out.

• U-values show how quickly heat escapes. Lower is better.
• Upgrade the worst first – that’s where the money leaks.