Air-to-Air Heat Pump Calculator
Calculate split air conditioners for heating and cooling according to EN 14825
Quick Start
What does this calculator compute?
The air-to-air heat pump calculator sizes split air conditioners for heating and cooling. These systems are ideal as a supplement to existing heating or for full supply of individual rooms.
Use cases:
- Single-Split: One outdoor unit + one indoor unit for one room
- Multi-Split: One outdoor unit + multiple indoor units for different rooms
- Bivalent operation: Combination with existing heating (gas, oil, pellets)
Calculation basis
The calculator is based on:
- EN 14825:2022: SCOP/SEER calculation for heat pumps
- VDI 4650: Annual performance factor for Germany/Austria
- Climate zones: Average (Central Europe), Warmer (Southern Europe), Colder (Northern Europe)
Input parameters
Outdoor unit
- Rated heating capacity: Power at 7°C outdoor temperature
- COP values: At various outdoor temperatures (A7, A2, A-7, A-15)
- SCOP/SEER: Manufacturer data for seasonal efficiency
- Minimum operating temperature: Important for cold winters
Indoor units
- Type: Wall unit, console, cassette, ducted
- Rated capacity: Heating and cooling power
- Room assignment: For multi-split systems
Bivalent operation
- Bivalence point: Temperature at which existing heating takes over
- Operating mode: Alternative, parallel or partial parallel
- Daytime operation: Optional daytime only (noise protection)
Results
- SCOP/SEER: Seasonal efficiency for heating/cooling
- Power consumption: Annual consumption in kWh
- Load profile: Hourly power consumption for PV integration
- Economics: Payback, savings vs. existing heating
Advantages of air-to-air heat pumps
Compared to conventional heating:
- High efficiency (COP 3-5)
- Heating AND cooling in one device
- Quick installation without water connection
- Room-by-room temperature control
For PV systems:
- Ideal addition for self-consumption
- Cooling in summer uses PV surplus
- Load profile export for solar calculator integration
Next step: With the Solar Calculator you can cover the power consumption of your air-to-air heat pump with a PV system.