Thermostats are divided into properties. There are thermostats that are designed for heat pump only, and others designated for electric heat, gas or oil heat. Please note abbreviations. Some thermostats are used for multiple stages of heat. Some thermostats use the 24 volt system wiring and some use batteries, and others that do both. Please call our Toll Free Number to discuss which one is best suited for your application. 1-888-242-7725 Mechanical Thermostats Digital Non-Programmable Digital Programmable Cooling Only Thermostats Heating Only Thermostats Line Voltage Thermostats Let us help you through the selection process. Value ac is a proud distributor of Hart and cooley registers, air diffusers, vent covers, and air conditioning vents. We can special order anything you need. Please call us at 1-888-242-7725 Toll Free for a quote. We want to earn your trust! Floor Registers and Vent Covers Blog