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never had an on call job I couldnt talk the customer out of.....but if I do go, its at my liesure and comfort. Plus I bill my company from the time the pager goes off until I finish dragging my feet....

Would go:
1. Rheem
2. Carrier
3. York

Lennox is over engineered, over priced p.o.s.

rip all the old venting attached to the chimney out and seal the chimney. Properly install venting. If you install 90%er then add a nice 90% water heater to tie into it. Best to stay away from...

find the end of your primary condensate drain line and blow it out with high pressure anything. If that doesnt work, cut the 'P' trap out and replace it.

is it an infinity zone system?

Have the service company check the amp draw on the compressor, that will let you know if it is the compressor taking a dump or some other symptom. It could be anything, especially to the untrained...

Send them to my mother in law...tell her there is a quarter inside....

70,000 btu Carrier should be enough for the application. You just need to have the condensing unit upgraded to a 0420 (3.5 ton) unit. Seems somebody may have gave you the okie doke or had no other...