My house gets naturally darker and cooler during winter so the temperature adjustment takes care of itself. The timer is changed around as I see them putting themselves to bed earlier/later. My chams are put outside on nice days and I think that helps them adjust to the seasons as well, especially in early summer when they start getting a lot of sun.
I fatten my beasts up in summer and fall and provide ample "rain" year round. Food is less available in winter and my chameleons (and other herps) go into a mild brumation and generally slow down. In winter, the house can get into the low 60's, especially at night. I notice that the chameleons sleep much deeper and generally stay in one area of the cage. They all seem much healthier for it, especially in spring when they start becoming more active and come out of brumation. You can tell they are feeling awesome; their colors are bright, they eat everything in sight, poop endlessly, and roam the cages lookin' for babes. They are starting to do this now and I think I will put them outside on the next warm day.
This is two panthers and a veiled, by the way, but I do it for all of my reptiles. I think mimicking mostly optimum natural conditions with an emphasis on environmental makeup, changes, and nuances is the best husbandry.