What we use as evidence
Core claims are checked against university extension services, public research programs and official technical documentation. A covering material is not treated as universally appropriate for every site; weather, structure type, ventilation, crop, budget and maintenance capacity are part of the decision.
How numbers appear on this site
Every number should state its context. A life estimate for greenhouse film, for example, is not a promise for every site. It can change with UV exposure, film specification, installation quality, wind movement, chemicals and maintenance. We retain the conditions used by the source wherever they are available.
We do not invent tests, testimonials, savings figures or performance guarantees. Affiliate links, when added, will be labeled and will not replace an explanation of fit, constraints and alternatives.
Core source ledger
- UMass Extension: Overview of Best Management Practices - Greenhouse covering lifespan and greenhouse structure context.
- Penn State Extension: High Tunnel Production - High-tunnel cover and season-extension context.
- Penn State Extension: Greenhouse Production - Double plastic and replacement-range context.
- UMass Extension: Energy and Shade Screens - Screen ranges and selection notes.
- UMass Extension: IR Film Energy Example - Connecticut operating example and stated assumptions.
- University of Minnesota Extension: Deep Winter Greenhouses - Passive solar greenhouse case context.