How to Replace a Thermostat
Thermostats are usually trouble-free pieces of equipment, but they can fail just like any other electrical device. Fortunately, replacement is an easy task as long as you pay careful attention to what you are doing. Below is a step-by-step guide to replacing your air-conditioning or heating system's thermostat: 1. Disconnect all electrical power - While thermostats rarely use connections with more than 24 volts of electricity, it is always safest to turn off the power supply.