Keep in mind that climate change also means more extremes in many places. Quite a few of those US places that have only gotten a little average warming have been getting getting more extremes and longer heat and cold waves.

I'd guess that for most people in the US they are more likely to notice that than to notice a change in average temperature. Consider someone in a place that normally gets cold enough to require heat for much of the winter and hot enough to require air conditioning for most of the summer.

Someone could easily not notice a 3℃ increase in average temperature that manifests as winter being a little less cold, summer being a little warmer, and winter being a little shorter, and summer a little longer because their HVAC system keeps their would at a fixed temperature all year around.

Their energy bill would go up, but they might think that is just due to inflation.

But if they start getting afternoon brownouts because of everyone's AC dealing with extreme summer heat, and that happens more and more each year, that is something they might notice