Example 1
- 120 m²
- U 1.2 → 0.25
- HDD 3500
- efficiency 0.85
- 0.24 kg/kWh
2,703.8 kg CO₂/yr
How much CO₂ from insulating 120 m², U 1.2 to 0.25? 2,703.8 kg CO₂/yr. U, not a quote.
Insulation CO₂
Type area, U before and after, HDD, efficiency and kg CO₂/kWh. 120, 1.2, 0.25, 3500, 0.85 and 0.24 give 2,703.8 kg CO₂/yr. 80 and 1.5 to 0.3 give 1,728.0 kg CO₂/yr. 150 and 0.9 to 0.2 give 2,688.0 kg CO₂/yr.
The U gap. 120 m² and 1.2 to 0.25 give 2,703.8 kg CO₂/yr. Not a wrap quote.
Results
Enter data and click Calculate.
How it works
Insulation CO₂ in this calculator is kg CO₂/yr saved from the U gap. 120 m², U 1.2 to 0.25, HDD 3500, efficiency 0.85 and 0.24 kg CO₂/kWh give 2,703.8 kg CO₂/yr. 80, 1.5, 0.3, 3000, 0.8 and 0.2 give 1,728.0 kg CO₂/yr. 150, 0.9, 0.2, 4000, 0.9 and 0.24 give 2,688.0 kg CO₂/yr.
Saved kWh = area × (U before − U after) × HDD × 0.024. kg = (kWh / efficiency) × fuel intensity. U after cannot catch U before. The /yr suffix sits in the result.
2,703.8 kg CO₂/yr is not a facade quote. 1,728.0 kg CO₂/yr does not know wool. 2,688.0 kg CO₂/yr is 150 m² and a smaller U.
Heat pump vs gas next door splits Q between a boiler and a pump. Household CO₂ reads the meter. Here U stays: 1.2 to 0.25 at 120 stays inside 2,703.8 kg CO₂/yr.
Type 120, 1.2, 0.25, 3500, 0.85 and 0.24, then Calculate. A comma in 0.25 parses. A U sketch, not a cost sheet.
120 and 1.2 to 0.25 give 2,703.8 kg CO₂/yr. 80 and 1.5 to 0.3 give 1,728.0 kg CO₂/yr. 150 and 0.9 to 0.2 give 2,688.0 kg CO₂/yr. Another U at 120 changes 2,703.8.
Formula
kWh = area × (U before − U after) × HDD × 0.024. kg CO₂/yr = (kWh / efficiency) × kg CO₂/kWh. U after < U before.
How to use
- Type 120 m², U before 1.2 and U after 0.25.
- Add HDD 3500, efficiency 0.85 and 0.24 kg CO₂/kWh.
- Click Calculate. The result is 2,703.8 kg CO₂/yr.
- 80 and 1.5 to 0.3 give 1,728.0 kg CO₂/yr. 150 and 0.9 to 0.2 give 2,688.0 kg CO₂/yr.
- CO₂ saved from U, not a wrap quote.
120 m², U 1.2 → 0.25 = 2,703.8 kg CO₂/yr
The U gap. 120 m² and 1.2 to 0.25 give 2,703.8 kg CO₂/yr. Not a wrap quote.
- Insulation
- Area and two U values. 120 at 1.2 and 0.25 leave 2,703.8 kg CO₂/yr. 80 leaves 1,728.0.
- CO₂
- Savings /yr. 150 and 0.9 to 0.2 leave 2,688.0 kg CO₂/yr. Not a wool price.
- U
- The factor before and after. 1.2 to 0.25 at 120 stays inside 2,703.8 kg CO₂/yr.
Examples
Example 2
- 80 m²
- U 1.5 → 0.3
- HDD 3000
- efficiency 0.8
- 0.2 kg/kWh
1,728.0 kg CO₂/yr
How much from 80 m² and U 1.5 to 0.3? 1,728.0 kg CO₂/yr.
Example 3
- 150 m²
- U 0.9 → 0.2
- HDD 4000
- efficiency 0.9
- 0.24 kg/kWh
2,688.0 kg CO₂/yr
How much from 150 m² and U 0.9 to 0.2? 2,688.0 kg CO₂/yr.
Related calculators
Common questions
How much CO₂ from 120 m² and U 1.2 to 0.25?
2,703.8 kg CO₂/yr. The U gap × HDD × 0.024, not a wool price.
How much at 80 m² and U 1.5 to 0.3?
1,728.0 kg CO₂/yr. A smaller area and other U values.
How much at 150 m² and U 0.9 to 0.2?
2,688.0 kg CO₂/yr. 150 m² and HDD 4000.
Is 2,703.8 kg a wrap quote?
No. CO₂ saved from U. A facade price sits outside this calculator.
What if U after is larger than U before?
The code clips U after so it stays below U before.
Where does 0.024 come from?
A constant with HDD in the code. You do not load it from a code table on the page.
Does a comma in 0.25 work?
Yes. 0,25 and 0.25 are the same U.
How is this different from heat pump vs gas?
That card uses Q, AFUE and COP. Here area and two U values.
Do blank persons split 2,703.8?
No. Options stay empty. The result is the annual saving.
Knowledge sources
The factors on the page are a sketch. Below are EPA emissions terms, not a national inventory.
Page updated in 2026.