Home energy efficiency
Find out where your home wastes energy
In two minutes you get your estimated energy class, what you spend on each item and the upgrades that pay back fastest.
- ✓No sign-up
- ✓Instant results
- ✓PDFs are never stored
How it works
From your bill to an action plan, in three steps
Describe your home
Floor area, year built, heating and appliances. If you have a bill, your real consumption makes the estimate more accurate.
See where the energy goes
Estimated class, cost by item and heat loss: walls, windows, air. All calculated instantly in your browser.
Choose what to do first
Upgrades ranked by payback time, with cost, yearly savings and new energy class.
A real example
90 m² flat in Rome, built in 1972
Conventional boiler, single-glazed windows, an old fridge and halogen bulbs.
Estimated energy spend
€1,943/year
up to €553 less every year
Upgrades, best value first
- 1
Switch to LED bulbs
Pays back in 4 months
−€175per year
- 2
Smart thermostat
Pays back in 2.4 years
−€103per year
- 3
Replace your fridge
Pays back in 11.3 years
−€62per year
- 4
Condensing boiler
Pays back in 12 years
−€233per year
- 5
Heat pump
Pays back in 15.8 years
−€577per year
Tools
Everything you need to spend less
Energy calculator
Seasonal energy balance for your city anywhere in the world, with NASA climate data: heating, hot water, cooling and appliances. If you enter your real consumption, the model calibrates itself to your home.
Open →🛒Efficient products
Smart thermostats, LEDs, high-efficiency appliances and air conditioners, matched to the upgrades you actually need.
Open →