Please clarify the question. If you take just 2 elements from your list, I mean
0. + Abs[-1.75447*10^6 - 0.184261 T] + Abs[-2868.55 + a + 0.276392 T]
and
0. + 2 Abs[-31999.5 - 0.221113 T] + Abs[-86832. - 0.1 T] + Abs[86832. + 0.1 T] + Abs[58261.9 + 0.442226 T]
(do you really need zeros here?) and generate a 3D plot of these two planes, say, for a from 2631708 up to 10^7 and for T from 0 to 2000
Plot3D[{Abs[-1.75447`*^6 - 0.184261` T] +
Abs[-2868.55` + a + 0.276392` T],
2 Abs[-1.75447`*^6 - 0.184261` T] +
Abs[3.50321`*^6 + 0.368522` T]}, {a, 2631708, 10^7}, {T, 0, 2000}]
then you may see that for some region the first function has bigger values and the second one has bigger values for the other domains
