Just ordered new replacement windows from my house. Granted we picked out the most expensive line of windows for aesthetic reasons but the marginal increase for the CA mandated coating was ~5% of the overall cost of the windows. Do I expect to save the entire $22k cost of the windows on my energy bills any time soon? No I do not. Do I expect to save the ~$1500 that I spent on the coating? Sure I'll probably get ROI in 5-10 years with energy bills averaging ~$300/mo (no solar and it's 100 degrees outside today).