3.5 ton Trane HP, dates to 2010 Temp testing with system on heating and off for cool down shows all areas tested within 2° of each other and from stat = fairly even distribution. Also, Customer has no complaints about cooling temps in summer. Added fiberboard plug to flex duct above vent in garage Noted 12×18 with 10" / 300cfn 18×24 with 14" / 1000cfm Ducting is undersized Existing single UV Bulb appears dated to 2018 Changed filters for customer and sealed area in supply plenum above the AHU