It could be Simply the Thermostat

Thermostats are significant components of any Heating, Ventilation, plus A/C system.

It is what allows a user to set the temperature of the heating system, AC, or other air conditioning units. A user needs to understand how best to use the control component plus assume what each control unit’s behavior shows. Periodically an easy issue with the control component can cause the entire component to seem to die. In such cases, knowing how to adjust the setting is important. If you are suspicious about the control unit and whether or not it is working, consider testing it. Testing on the control component tests is pretty straightforward, but you may need the assistance of your Heating, Ventilation, plus A/C worker, because of the specialized tools that he is likely to own. First, you need to make note of the potential symptoms that may cause the heating system to require testing. The first common thing that happens is when the control component refuses to turn on. In most cases, the control component may be suffering from a wiring issue. You may also need to test the control component when the HVAC isn’t making the house cold or hot enough. A test is necessary every time you realize that the control component causes inappropriate temperature changes. It would help if you also considered testing when the control component seems to be like the energizer bunny and running continuously without stopping plus also when the control component has no power even with new batteries. Thermostat tests depend on the type of control unit. They are different for smart thermostats than they are for the traditional kind of thermostat. However, if nothing changes even after an extensive thermostat test, look for other answers.

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