There are several different types of residential thermostats available, including:

1. Mechanical thermostats: These are the most basic type of thermostat, and use a bimetallic strip to sense the temperature and control the heating and cooling system.
2. Electronic thermostats: These thermostats use electronic sensors to measure the temperature and control the heating and cooling system. They are more accurate and can be more precise in their temperature control than mechanical thermostats.
3. Programmable thermostats: These thermostats allow homeowners to set a schedule for the heating and cooling system, so the temperature can be automatically adjusted at different times of the day. This can save energy and money on heating and cooling costs.
4. Smart thermostats: These thermostats can be controlled and programmed using a smartphone or other device, and can often be integrated with other smart home devices. They can learn the homeowner’s preferences and automatically adjust the temperature to provide the most comfortable indoor climate.