I have a digital Honeywell thermostat and lately been noticing that the temperature reading is consistently higher than what the actual room temperature is. The thermostat is roughly 2-3 years old. You can set thermostats way higher or lower than the HVAC system can deliver. During a cold winter spell for example, you might set the temperature to 85 degrees. Thermostat is showing lower temperature (54 degrees) than set temperature (72 degrees). But your furnace can deliver only enough BTUs to … A simple recalibration can often do the trick. The difference in temp is quite large too, the room temp is around 19-20C and the thermostat would be showing 25C. Your air conditioning thermostat has a direct impact on how much electricity you use. Clearly, something is wrong. How Does the Thermostat Work? A thermostat is actually a switch; a switch often connected to complex computer controls, but still a switch that’s “on” or “off.” When the indoor temperature registers as higher than the setting on the thermostat, the thermostat turns on the compressor to start cooling the space. I keep it set on 70 upstairs during this time of year, and this week the house is about 4 degrees higher, then drops back to the thermostat reading in the evening. Otherwise, it stays consistent with what my setting is at. Reasons Why Your Thermostat is Reading the Wrong Temperature. They were recharged by Justin to get me through the Summer. If it detects that the temperature is higher than your set point, it engages your HVAC system. Cold air is coming through - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. A thermostat can be recording the wrong temperature for a variety of reasons: Your thermostat’s sensor is malfunctioning. In some cases, a sensor can be recording the wrong temperature. The only way to keep the temperature in range is by setting the thermostats in “hold” that totally defeat having an schedule running. Thermostat Temperature Set Too High or Too Low Problem. It allows the heating to be fully on until the set temperature is reached, at which point the thermostat will turn the heating off until the temperature drops again. Yeah, my units are now 12 years old. Wait 15 minutes and check the temperature reading on both devices. Cleaning a Thermostat. I started to troubleshoot the thermostat’s by re-running the schedule, resetting to factory and updating the firmware, to my surprise nothing worked, the drops in temperature continue, always by 5-7 degrees. A variance of +/- 3˚F is generally acceptable, but anything outside that range means your previously accurate thermostat may require service. From time to time, a thermostat’s mechanical contacts will require cleaning to maintain accuracy. 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