We have selected the best selling home thermostats under $100 dollars. Check out our comparisons. The Nest thermostats have been popular over the years. The Nest thermostats range over $100 dollars. They are a bit pricey but totally worth the price. Our readers have asked us to do a review about a good thermostats that cost around $100 dollars. Fortunately, there are other manufactures of thermostats that make affordable home thermostats for less than 100 dollars. Check out our reviews for the best Home Thermostats Under $100.