When sizing an air conditioning unit for your conservatory, it’s important to calculate the correct cooling capacity to ensure year-round comfort. In the UK, the typical cooling duty required ranges from 220 to 300 watts per square metre (W/m²), depending on factors like sunlight exposure, glass coverage, and insulation. A basic estimate of 220 W/m² is suitable for well-shaded or north-facing conservatories, while 300 W/m² is recommended for sun-exposed spaces, such as south-facing conservatories with large glass areas.

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• A basic estimate is around 220 W/m².   

• For conservatories that are prone to significant heat gain (e.g., south-facing, large glass area), a higher figure of 300 W/m² is often recommended.   

 

By multiplying your conservatory’s floor area by the appropriate wattage estimate, you can get a good idea of the air conditioning power needed - though it’s important to remember that every space is unique, and factors like glazing, ventilation, and shading can all affect the final requirement.

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Example:

For a conservatory measuring 4 metres by 3 metres (12 square metres):

• Using 220 W/m²: 12 m² * 220 W/m² = 2640 Watts

• Using 300 W/m²: 12 m² * 300 W/m² = 3600 Watts

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It's important to note that these are basic estimates. Several other factors can influence the actual cooling load required for your conservatory, including:

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• Orientation: South-facing conservatories will receive more direct sunlight and require more cooling.    

• Glazing type and area: Large expanses of glass, especially if not energy-efficient, will lead to greater heat gain.

• Insulation: The level of insulation in the roof, walls, and floor will affect how much heat enters the conservatory.

• Ventilation: Good ventilation can help to reduce heat build-up.    

• Internal heat sources: Appliances, lighting, and the number of occupants can contribute to the heat load.    

• Blinds and shading: Using blinds or other shading can significantly reduce solar heat gain.

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After completing a site survey, our engineer will determine the correct unit size for your conservatory and recommend the most suitable options for you to choose from.