CT30A THERMOSTAT HEAT ONLY | The Honeywell CT30A1005 heat only thermostat is non-programmable and has low voltage controls with a snap-action switch for heating systems. This unit does not require leveling and is not compatible with electric baseboard heat, heat pump systems or multi-stage heating/cooling systems. For straight-forward temperature control, there's no substitute for Honeywell's non-digital thermostats. Non-digital thermostats control heating and cooling in your home simply and effectively. Aesthetically pleasing and simple to use, Honeywell non-digital thermostats have been the industry standard for over 50 years.