Room BTU / AC Sizing Calculator
How many BTU/h of cooling or heating your room needs.
Result
- Required BTU/h
- 13,200
- Equivalent kW
- 3.87
- AC tons
- 1.1
HVAC & Climate calculators
BTU sizing, duct CFM, AC tonnage and heat-loss estimates.
Duct CFM & Size Calculator
Required airflow and duct diameter for a room.
Result
- Required CFM
- 133
- Round duct diameter
- 4.71 in
Heat Loss / Boiler Size Calculator
Quick whole-house heat loss for boiler or heat pump sizing.
Result
- Required output
- 10.78 kW
- Suggested boiler
- 12 kW combi
Heat Pump ROI & Payback (EU)
Annual savings and payback period for an air-source heat pump vs your existing gas/oil boiler at local electricity and fuel tariffs.
Result
- Heat pump running cost
- €933/yr
- Old system running cost
- €1,412/yr
- Annual saving
- €478
- Net install (after grant)
- €9,000
- Payback period
- 18.81 years
Heat Pump Savings Calculator
Annual running cost and $/€ savings of an air-source heat pump versus your existing gas, oil, LPG or electric-resistance heating.
Result
- Heat pump electricity use
- 3,333 kWh/yr
- Heat pump running cost
- $933/yr
- Current system running cost
- $1,412/yr
- Annual saving
- $478/yr
- CO₂ saving
- 2,057 kg/yr
- 10-year saving
- $4,784
Live burn model
Seasoned wood logs
Room
48 m³
Useful heat
4.9 kWh
Result
Below target
Fuel moisture20%
Room temperature forecast
Indicative model; ventilation, thermal mass and fire control change the result.
Carbon output
Fossil CO₂
0 kg
Biogenic CO₂
6.6 kg
Supply-chain CO₂e
0.2 kg
Fuel for target
2.4 kg
Fossil CO₂
0 kg
Biogenic CO₂
6.6 kg
Supply-chain CO₂e
0.2 kg
What the carbon figures mean
Fossil CO₂ is released from coal, gas, LPG and oil. Wood and charcoal show biogenic CO₂ separately: it still enters the atmosphere at the chimney, while regrowth and sourcing determine the longer-term climate effect. Supply-chain CO₂e estimates processing and transport.
Combustion safety
Particulate risk is high. Use only a correctly installed, vented appliance with a working carbon-monoxide alarm. Never burn coal or charcoal in an open, unventilated room.