A spring wound, mechanical, and a push button in-wall timer are low cost and cost efficient. The spring wound timer switch is the most simplistic wall timer you can have, but the mechanical and push button timer switch are only one step up.
- Spring Wound: Allows you to turn circuits on and off withing a miniam amout of time from 15 minutes to 24 hours. These light switch timers are easy to use, but they require you to manually twist a dial to set a time for the duration you need. There is no programmed needed or required, and are typically used for spas, heat lamps, and outdoor lgihting.
- Mechanical: This in wall timer is the second generation after a spring wound timer and usually has a spring or dial to operate for up to a 24 hour period. The timer will automatically turn a circuit on or off and are fairly reliable in places such as bathrooms, entryways, hallways, indoor and outdoor lighting, lamps, and for holiday lighting.
- Push Button: This in wall timer also has basic controls with multiple buttons on it to give you a specific amount of time, usually 5 minutes to 12 hours, that the device will operate. They can automatically shut off lights, spas, heaters, ceiling fans, bathroom fans, and many other devices