Oh, no, no heat needed at those temps! My birds have seen temps as low as -20° F without issue. Not even frostbite (except a few comb tips, though one was because she liked to dunk her comb in the water bucket

). I only intervene in cases that I've found it to be necessary--a bird that's ill, injured, or otherwise not acting right, in a heavy molt (such as Tessa), or very young (say, less than 3 months old). In such cases, I never add heat to the entire flock, but instead move individual birds to a location where they can be provided heat individually. I would suggest you take a look through one of the articles I've written discussing the many adaptations that these birds have for cold weather. As you've observed, they seem to like colder weather much better than they do hot weather. It's much easier for them to keep warm than it is for them to cool off in high heat because of the structure of their feathering. There are exceptions, of course, and extreme temperatures at which intervention may become necessary, but I don't think you'll see anything low enough to warrant such action where you live.
https://www.backyardchickens.com/ar...k-at-the-question-of-supplemental-heat.67147/
P.S. If you do decide to heat after all, I would
strongly suggest you switch out the heat lamp for something else. Not only are large heat bulbs a big fire hazard, but continuous light (yes, even the supposedly superior red lights) is very unhealthy for these birds. There are heating plates specifically for chicken coops, plus ceramic bulbs that emit heat without light that would work well for the job as well.