The Honeywell CT30A1005 Heat Only Thermostat has low voltage controls with a snap-action switch for heating systems. This non-programmable thermostat does not require leveling. For straight-forward temperature control, there's no substitute for Honeywell non-digital thermostats. Non-digital thermostats control heating and cooling in your home simply and effectively. Aesthetically pleasing and simple to use, Honeywell non-programmable thermostats have been the industry standard for over 50 years.