Double-layer inflated film greenhouse
Two films and a controlled air gap: the cheapest way to hold night temperature and stop condensation dripping on the crop.
The two films are kept apart by a small blower that maintains pressure in the cavity. That air layer cuts heat loss at night and keeps the inner film above the dew point, so condensate forms far less often than on a single skin.
It suits cold-winter sites and high-humidity sites, and it is often paired with a thermal screen and a modest heating system instead of a fully heated glasshouse.
Configurations
Cold-night
Maximum gap for insulation, paired with thermal screen.
Humid
Slightly lower gap and higher ventilation rate to avoid a stagnant inner layer.
Structure and covering specification
| Cover | 150/150 μm double fixed film with inflation blower |
| Structure | Multi-span or tunnel frame |
| Benefit | Lower night heat loss, less condensation, quieter internal climate |
| Limits | Lower light transmission than single film or glass |
| Maintenance | Blower, film tension and cavity pressure checked each season |
Values are the standard range. Final dimensions, loads and covering are fixed per project against the site's climate data.
Questions buyers ask about this family
How much light does the second film cost?
Expect roughly 5 to 8 percentage points of transmission depending on film and dust. In low-light winter sites that matters; in high-light sites the insulation usually pays for it.
What happens if the blower stops?
The films touch, insulation collapses and condensation returns. Put the blower on the maintenance list and keep one spare unit on site.
Other families and next reads
Put this family against your site
Send the country, the area and the crop. We reply with a configuration, a preliminary layout and the questions that change the price.