Bubble wrap insulation raises minimum greenhouse temperatures by 1-2C and reduces heat loss by up to 50%. Attach it to the inside of the frame using glazing clips or lining hooks from October. Remove it by late March to restore full light for spring growing. Polycarbonate greenhouses already retain 30-40% more heat than glass models. Combining insulation with a thermostat-controlled heater keeps a 6x8ft greenhouse frost-free for under 20 pounds per month.
Key takeaways
- Bubble wrap insulation reduces greenhouse heat loss by up to 50% and raises minimum temperatures by 1-2C
- Fit insulation in October before the first hard frosts and remove it by late March
- Use horticultural bubble wrap with large air pockets, not standard packaging wrap
- Polycarbonate greenhouses retain 30-40% more heat than single-glazed glass models
- Combining insulation with a thermostat-controlled heater keeps frost at bay for under 20 pounds per month
- Draught-proof gaps around doors, vents, and base rails to stop cold air leaking in
greenhouse insulation bubble wrap greenhouse winter greenhouse frost protection greenhouse heating grow your own
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