From CDC/OSHA wrt Covid, "good" would be defined as amount of fresh air provided and HEPA filter classification improvements (eg MERV 13+).
Not SEER rating. Overall energy efficiency is worse as businesses are conditioning more outside air than typical.
It's been my general experience the big boxes are ahead on this. They have large spaces to begin with, as well as capital to invest.
You are free to wear what you want, but CDC mandating it at this point is not following the best science. If you are vaccinated, and in a building with good ventilation, without a mask, your overall risk profile is very low, regardless of the minority of unvaccinated around you.
Your chances of going maskless, getting covid from your trip, and ending up in the hospital seriously ill are vanishingly low.
You probably take more risk getting into a car and driving over than not wearing a mask once there, not to mention the items that go into your cart if they contribute to elevated risk of heart disease or cancer.
The greatest threat to me in the big box store, and during the drive to the store are other stupid people. En route to the store I wear my seatbelt, have airbags, and drive defensively. While in the store is not the time to let my guard down. I fully believe that the anti-vaxxers, hoax believers, etc., will clearly lie, and would even go to the store if they were experiencing symptoms.
Due to age and other health issues, I am not in the low risk category, however even if I were in the low risk category, a vaccinated person can still contract COVID and while asymptomatic spread it to others.
At best, it would require a 2-week quarantine, at worst infect someone that can't be vaccinated. We have a friend we see about once a week now that things are opening back up. Her doctor has advised here against the vaccine as she is still dealing with another virus that has hammered her hard, Lyme disease.
That's how people that aren't stupid, or selfish view taking care of others, including strangers.