great job! I did a friends like that years ago. One of the things we found out was that it is helpful to re-adjust the door springs for the added weight. I know its not much weight, but for the door opener to live a long life, it good for the door to be properly balanced.
Getting the right filter is not an easy process, but once found, your HVAC system will last longer, run more efficiently and stay cleaner.
so a couple of concepts.
1. HVAC systems are not air cleaners. Cleaner air is a byproduct of the filters which are designed to keep the evaporator coils...