SPTYTX

So I've got a 2014 Corolla, a 2011 Camry V6 and 2016 Camry SE. The 2011 V6 handles heat and cold in Texas very well. Have had trips to Colorado and it handles the mountains well. Even tho the SE is in Colorado it hasn't had much mountain use. The 2014 Corolla with the I4 has a mediocre at best A/C for the Texas heat, fairly good at heat. Pick up on an inclined access with full A/C in summer lags. I know technology has really advanced over the years but in thinking of upgrading the 2011 V6 to 2020 or 2021 I'm worried that the 4 cylinder Camry won't handle the Texas heat or the Colorado mountain roads. Has anyone got any opinions on those scenarios?

So we don't have a 2020 (yet) but see the reviews while looking at them. We do have currently a 2011, 2014, 2016 w/o issues but looking to upgrade the 2011. Does this solution indicate most folks have the remote start app working thru their phone/Verizon or are signed up for a radio subscription service? Or is this something that is left "ON" from the factory as a default?