5 Signs That An HVAC Thermostat Needs To Be Replaced

HVAC systems are complex and composed of many parts and features. Thermostats may be small, but they are an important part of systems. They may fail before it is time to replace a system. There are different types of thermostats. Homeowners need to know when it is time to replace theirs. These critical parts may exhibit specific signs that they need to be replaced. Sometimes a thermostat may need to be replaced even if it appears to be functional. The following points highlight the signs that HVAC services are needed for a thermostat replacement.


Outdated thermostats need to be replaced even if they appear to be working. Many homeowners choose to upgrade their thermostats based on newer technology—such as smart thermostats—being available. Replacing obsolete thermostats can aid in improving energy efficiency. 

Blank Display

Some homes have digital thermostats. The screen should always be visible. If it goes blank, the unit needs to be replaced. Sometimes a screen will intermittently go blank, which is a good indicator that it is on the verge of failure. A blank screen could be a repair issue rather than a replacement. Faulty wiring, low battery, or safety switch issues are things that can be repaired or adjusted. 

Improper Cycling

Thermostats are supposed to keep temperatures consistent. They should cycle at the correct intervals when temperature changes are detected. If an HVAC system turns on and off at odd intervals, it is a sign that the unit is not operating correctly and likely needs to be replaced. Another phenomenon is that a unit may run continuously and not detect temperature fluctuations. Some homeowners may dismiss continuous running as unimportant. However, this issue affects energy efficiency and can result in higher energy bills.

Activates at Wong Temperature 

Thermostats are designed to turn on and off based on the temperature selected. If they activate and turn off at the wrong temperature settings, it is likely a sensor issue. HVAC services may be able to recalibrate the unit. If that isn't an option, it will need to be replaced. 

Unpredictable Savings Settings 

Some thermostats are designed for the homeowner to set saved times for the unit to activate. If it stops responding or is unpredictable, the unit likely needs to be replaced. These types of thermostats are designed to make life more convenient. If they have to be reset every day or do not activate at the saved settings, it is a sign that the unit has malfunctioned and needs to be replaced. 

An HVAC contractor is a good resource to use to learn more about replacing thermostats. They can help homeowners compare thermostats and ensure that the thermostat they select is compatible with their HVAC systems. 

Contact a local HVAC service to learn more.