@pha720 mylar is very cheap and affordable
https://www.amazon.com/Reflective-Silver-Accessories-Greenhouse-Covering/dp/B07RXCLY67/ref=sr_1_18?dchild=1&keywords=mylar+film&qid=1612209520&sr=8-18
I currently have 2 grow ops running at the moment. This will be my last run before the Summer, going to have to take a season break to relocate the family.