Why Is this Not Working? Homeowner HVAC Edition

Our natural first reaction to something not operating correctly is usually: why is this not working? Our second reaction is to promptly Google the issue, trying to find an easy solution. But when it comes to our air conditioning and heating systems, technical difficulties are trickier than replacing an old light bulb in your refrigerator. Here are general answers to the top 3 most common questions homeowners have in regards...