When my thermostat is set for cool, the ac and furnace both come on and run at the same time.

I have a new house with heat pump. Although the thermostat senses the outdoor temperature and will auto select cool or heat, it will not that the next important step to auto select emergency heat when outdoor temperature is below set point. What should the emergency heat set point be? Is a heat...

I replaced my old thermostat with the RTH230B and it seems as though the fan comes on but there is no hot air coming out with the heater setting. I put the wires in the spots that they were in the old thermostat, but there was an extra blue wire that was not connected in the old so I did not...

New thermostat installed, I have wired it based on the manual, 4 wires- W, are, G, why. I have done all the preset, but have no heat. I tried re-set the main breaker, and I have also checked the pilot on the furnace. Any help would be great. I have my house set at 21 C, and it is only 15 C right now

I installed this termostat replacing an older programmable 5 wire model that controls one of my central air/heat units. I installed the same model last year. I checked the wiring on my other unit, wired this one the same, programmed it and turned the heat up until it displayed "heat on" on the...