Home Insulation Savings
Insulated Area (m²)
Current R-value
New R-value
Heating Degree Days
Energy Rate ($/kWh)
Home insulation reduces heat loss through walls, loft, and floor. Higher R-value = better insulation. Loft insulation typically offers the fastest payback — often under 2 years.
- 1Heat loss ∝ Area × U-value × ΔT (U = 1/R)
- 2Doubling R-value halves heat loss through that element
- 3Payback = Install cost / Annual energy saving
- 4UK ECO4 scheme may fund upgrades for eligible households
80m² loft, R-2 → R-6, 3,500 HDD, £0.07/kWh gas=Annual saving ≈ £320; £600 install cost; payback ≈ 1.9 years
| Material | R-value per inch | Use |
|---|---|---|
| Mineral wool batts | 3.0–3.8 | Loft, walls |
| Rigid foam (PIR) | 6.0–7.0 | Roofs, floors |
| Spray foam (closed) | 6.0–7.0 | Awkward spaces |
| Cellulose blown | 3.2–3.8 | Loft infill |
References
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