Replacing a home thermostat can be done with basic tools and some electrical knowledge. Here are some simple instructions to replace a home thermostat:

1. Turn off the power: Before working on any electrical component, make sure to turn off the power to the HVAC system at the circuit breaker.

2. Remove the old thermostat: Remove the cover of the old thermostat by gently pulling it off the wall. Use a screwdriver to remove the screws that hold the mounting plate to the wall. Carefully disconnect the wires from the old thermostat and remove it from the wall.

3. Identify the wires: Identify the wires that were connected to the old thermostat. The most common wires are labeled R (red), Y (yellow), G (green), W (white), and C (blue or black).

4. Install the new thermostat: Install the new thermostat in the same location as the old one. Most new thermostats come with a mounting plate that can be attached to the wall using the screws provided.

5. Connect the wires: Connect the wires from the HVAC system to the corresponding terminals on the new thermostat. The wiring configuration may vary depending on the make and model of your HVAC system and the new thermostat.

6. Turn on the power: Turn on the power to the HVAC system at the circuit breaker and test the new thermostat. Set the temperature to a desired level and check if the HVAC system is turning on and off correctly.

7. Program the thermostat: Program the new thermostat according to the manufacturer's instructions to ensure optimal performance and energy efficiency.

Note: If you are unsure of how to replace the thermostat or do not feel comfortable working with electrical components, it's best to seek the help of a licensed HVAC technician to avoid any potential safety hazards. Contact a local HVAC contractor if you do not feel comfortable or do not have electrical experience.