Pro tip: That 'safe' spray foam in your walls might be a total lie, I see it all the time
As an HVAC guy who went solo, I've ripped out so much spray foam that stank like chemicals and made folks sick. The big companies swear it's fine, but there's a whole debate they're shutting down about long-term fumes. I found studies online that get deleted fast, talking about respiratory issues from off-gassing. Just last week, a customer had mold growing behind their foam because it sealed in damp air and ruined the framing. They spend a fortune on this 'premium' stuff, but it's just a scam to sell more product. Go with basic batts or blown-in cellulose instead, it breathes better and costs less. Seriously, do your own research before you believe the hype. This isn't just me talking, it's a real cover-up they don't want you to question.