Importance of HVAC system insulation none of the troubleshooting tips we’ve talked about over seem to fix the problem, it’s a good indication a completely new thermostat is in your potential. Here are a few other signs to watch out for that point out you would possibly need a thermostat substitute:You need to have the skills as well as the equipment to be aware of the appropriate charge. With airflow across the evaporator coil in air conditioner troubleshooting, you need to check the air filter to ensure It's not clogged with Grime or debris.Ensure that the blower is popping the appropriate RPM’s and furnishing the appropriate amount of flow. It needs to pull (or drive) image source the correct level of airflow throughout the evaporator coil.