Air Conditioning Calculator
Calculate the required cooling capacity and electricity costs of an air conditioner for your room. Free online tool, includes 2026 reference values and savings.
Required cooling capacity
3,0 kW
10.202 BTU/h
Electricity cost / season
125,58 €
ca. 359 kWh
Recommended size
12.000 BTU (ca. 3,5 kW)
The calculation is based on approx. 80 W/m² base capacity plus surcharges for windows (solar radiation), number of people and insulation. Electricity costs are estimated with a SEER value of 4 (typical split air conditioner).
Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
Frequently Asked Questions
How much does it cost to run an air conditioner?
A typical room air conditioner (2.5 kW cooling capacity, about 0.9 kW power consumption) costs approximately 0.30-0.40 euros per hour at current electricity prices. Running it 8 hours daily for 3 months costs 200-300 euros.
What types of air conditioners are there?
The main types are split systems (fixed installation, most efficient), monoblock/portable units (flexible, less efficient), and central air conditioning. Split systems have the best cooling performance per watt.
What is the Air Conditioning Calculator?
The air conditioning calculator computes the required cooling capacity for a room and the annual operating costs of an air conditioner.
How does the Air Conditioning Calculator work?
Enter the room size, ceiling height, window area and orientation. The calculator determines the required cooling capacity in kW and the annual electricity costs at typical usage. Split and portable units are compared.
Key Data and Facts
Rule of thumb: approx. 60-100 watts cooling capacity per sqm. Electricity consumption: 300-500 kWh/summer. SEER value (efficiency): higher is more economical. SEER 6.0 or above = energy class A++.
Step-by-Step Guide
How to calculate die passende Kuehlleistung step by step: 1. Raumgroesse bestimmen: Messen Sie Laenge, Breite und Deckenhoehe des Raums. Raumvolumen = L x B x H. 2. Kuehlleistung schaetzen: Faustregel fuer gut isolierte Raeume: ca. 60 W pro m2. Fuer schlecht isolierte Raeume oder Dachgeschoss: ca. 80-100 W pro m2. Grosse Fensterflaechen nach Sueden oder Westen erhoehen den Bedarf um 15-20 %. 3. Zusaetzliche Waermequellen beruecksichtigen: Jede Person ca. 100 W, PC/Monitor ca. 150-300 W. 4. Geraetetyp choose: Split-Klimageraet (SEER 5-8, leise, effizient, fest installiert) oder Monoblock (SEER 2-3, mobil, lauter). 5. Betriebskosten calculate: Stromverbrauch = Kuehlleistung / SEER x Betriebsstunden. costs = Stromverbrauch x Strompreis. 6. Energieeffizienz beachten: SEER 6,0+ = A++, SEER 8,0+ = A+++. Je hoeher der SEER-Wert, desto niedriger die Betriebskosten.
Calculation Example
Raum 25 m2, gut isoliert: Kuehlleistung = 25 x 60 = 1.500 W (1,5 kW). Split-Geraet mit SEER 6,0: Stromverbrauch = 1.500 / 6 = 250 W. Bei 500 Betriebsstunden/year: 125 kWh = 46 EUR/year.
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