We have had many questions and problems about thermostats and about thermostat installations. I found a very good video on the ACservicetech youtube channel. Please click here if you are interested in seeing some of the many outstanding HVAC service and troubleshooting videos. Below we have an excellent Youtube video that I copied from the ACservicetech channel which shows 12 problems, mistakes that we can make when installing or replacing a thermostat. I hope this helps you out. If you have any questions please email me, Steve Arnold anytime. Our email address is: firstname.lastname@example.org. We would love to help you out and earn your business!