I just droped 2K on 12 Seer 3 ton unit.(gas furnace/evap cooler/condensor).
In hindsight I was wondering if I should have installed Purification system
along with it. The 1400 cfm purification unit runs about $450. Since
system is allready installed, should I just let it go, or is installation
after the fact reasonable. (smoker-need something).

...also what is a TROLL?