My buddy just moved into a house that has all Lennox equipment. I don't see much of that since the company I work for is a Carrier dealer. The furnace is a 90% gas. It has the craziest air filtration setup I've ever come across. Lennox labeled with media filter, ultraviolet light, and some other panel all in one bracket with each section able to be slid out for replacement. My question concerns the a/c....the condenser is freakishly huge(how's that for a technical description). It's a 410a system, that much I know...I'd like to know the tonnage and seer rating if anyone can help. The model and serial are as follows.... HSXA19-038-230-02, 5803D 25242. Also, the t-stat is a Lennox Signature Stat model 51M26(or 27, or 28, I'm not sure which in his particular case). It has three little led lights, one for cool, one for heat, and one that is listed as auxillary. The aux. light is on during a call for cool, is that a normal function? I can't locate any reference in the stat manual concerning that light with regard to cool function. It only seems to concern the heating function. The bottom line at this point is that as of now it's not cooling properly. I went up once without my 410 gauges(never thought this house would have 410) I have to go back and just wanted a little info if possible. Any help would be greatly appreciated.