Where you put your thermostat can greatly change how effective it is. If your thermostat is directly under an air conditioner or next to a window, this cool air will make your thermostat think that the room is colder than it really is. If the thermostat is over a lamp, television or heat source, it will read warmer than the room is. Put your thermostat away from these items and you'll get accurate readings to send the right commands to your heating and cooling systems.
Honeywell thermostats, White Rodgers thermostats, Robertshaw thermostats, Lux thermostats, Wirsbo thermostats, and Tekmar thermostats can be found at www.supplyhouse.com