# Energy Savings Calculator

> Calculate potential energy savings from home improvements. Compare insulation, glazing, solar, and heat pump savings instantly.

Canonical: https://renoquant.com/energy-savings-calculator
Prices updated: 2026-03

## How Much Could You Save on Energy Bills?

Every home is different, but most households can reduce energy bills by 30-60% through a combination of improvements. This calculator shows you exactly where your money goes and which upgrades offer the fastest payback.

### Savings by Improvement Type

| Improvement | Annual Saving (EUR) | % of Typical Bill | Best For |
|------------|--------------------|--------------------|----------|
| Loft insulation (0 to 270mm) | 250-450 | 15-25% | Homes with less than 100mm insulation |
| Cavity wall insulation | 150-300 | 10-20% | Pre-1990 homes with unfilled cavities |
| Draught-proofing | 50-100 | 3-5% | Old windows and doors |
| Double glazing (from single) | 200-400 | 10-20% | Homes with single glazing |
| Solar panels (4kW) | 400-800 | 20-40% | South-facing roofs |
| Air source heat pump | 300-600 | 15-30% | Replacing old gas/oil boilers |
| Smart thermostat | 100-225 | 5-15% | Any home with central heating |
| LED lighting throughout | 50-100 | 3-5% | Homes still using halogen/CFL |

### Cumulative Savings Over Time

| Year | Insulation Only | + Glazing | + Solar | + Heat Pump | All Four |
|------|----------------|----------|---------|-------------|----------|
| 1 | EUR 350 | EUR 650 | EUR 1,250 | EUR 1,750 | EUR 1,750 |
| 5 | EUR 1,750 | EUR 3,250 | EUR 6,250 | EUR 8,750 | EUR 8,750 |
| 10 | EUR 3,500 | EUR 6,500 | EUR 12,500 | EUR 17,500 | EUR 17,500 |
| 15 | EUR 5,250 | EUR 9,750 | EUR 18,750 | EUR 26,250 | EUR 26,250 |
| 20 | EUR 7,000 | EUR 13,000 | EUR 25,000 | EUR 35,000 | EUR 35,000 |

These figures assume stable energy prices. With energy costs rising 3-5% per year, actual savings will be significantly higher. A comprehensive energy plan can save EUR 35,000-50,000 over 20 years.

### Quick Wins: Free or Low-Cost Savings

Before investing in major improvements, capture free savings first. Turn down your thermostat by 1C (saves 10% on heating). Set hot water to 60C instead of 70C. Use the eco setting on your washing machine. Close curtains at dusk to retain heat. Turn off standby appliances. These habits alone save EUR 100-200 per year.

## Frequently Asked Questions

### How much can I save by insulating my loft?

Loft insulation to 270mm saves EUR 200-400 per year for a typical 3-bedroom house. If your loft has no insulation, savings can reach EUR 500+. The cost of EUR 500-1,500 pays for itself within 2-5 years, making it the single best energy investment.

### Will a smart thermostat really save me money?

Yes. Smart thermostats save 10-15% on heating bills by learning your schedule, adjusting to weather, and allowing remote control. For a home spending EUR 1,500/year on heating, that is EUR 150-225 saved annually. They pay for themselves within 1-2 years.

### How do energy savings change with electricity prices?

Higher electricity prices increase the savings from every improvement. If electricity costs rise from EUR 0.25 to EUR 0.35/kWh, your savings from solar panels increase by 40%. Energy improvements become more valuable over time as prices tend to rise.

### What is the most cost-effective renewable energy for homes?

Solar panels offer the best return for most homes. A 4kW system costs EUR 5,000-8,000 and saves EUR 400-800/year with a 8-14 year payback. Air source heat pumps cost more (EUR 7,000-14,000) but save 30-50% on heating if replacing an old gas boiler.

### Can I do a home energy audit myself?

A basic audit is easy: check loft insulation depth (aim for 270mm), feel for draughts around windows and doors, check window glazing type, note your boiler age and type, and review 12 months of energy bills. For a detailed assessment, hire a certified energy assessor.

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Interactive version with calculator: https://renoquant.com/energy-savings-calculator. Figures are estimates; final quotes vary by site conditions, materials, and region.