Hi sorry I haven't got back sooner. The model number of the outside unit is 593CJ024-B
The furnace number is 395CAV042091
I do have an inferred thermometer.
the square footage does include the finished basement, its a bi-level with half of the downstairs underground. Nice and cool in the summer and cold in the winter. The upstairs is hot!
There are two returns, a 6 x 24 in the downstairs, and a 12 x 24 in the upstairs. I have 11 vents.
I noticed the thick cold tube's insulation covering was pretty rotten and inside the unit it wasn't covered. so I put a new one on. Didnt seem to help any though.
Thanks for the help here, I really appreciate it