When an air conditioner won’t work properly, people often assume what they know to be common air conditioning problems. They may ask us, “Does it just need more refrigerant?” Or, “Is the thermostat broken?” We should let you know, before we move on, that while refrigerant leaks are common, simply refilling the refrigerant is rarely a solution. You must seal the leaks, too.
Otherwise, the thermostat is rarely the problem when the air conditioner completely struggles to run as intended, and we must look to components inside the system. We may have to do a bit of detective work to determine what went wrong, and often we find it’s the same culprit: the air filter.