If you grow your succulents indoors year round, they won’t notice much change in temperature unless they are right by the window. As a general rule, succulents like to be warm during the summer and cool during the winter. If you can, keep the temperature in the summer between 70 and 80 degrees. During the winter, you’ll want your succulents to be a little colder, between 50 and 60 degrees. Most succulents can tolerate higher and lower temperatures as well, but those are the ideals. Generally it is not a good idea to let the succulents get below freezing as this tends to cause damage to most succulents. Having your plants by the window and keeping your house at a normal temperature should work just fine. They get a little warmer by the window in the summer and a little cooler in the winter.