Frequently Asked Questions (FAQ) about Air Conditioning Troubleshooting

Sunday, November 14, 2021

“What happened? It was working just a minute ago!”…..Here’s links to our articles with strategies for figuring out the cause of an a/c problem, and how to fix it yourself when it’s fairly simple:

Why has the thermostat screen gone blank? 

Why is my air conditioner not cooling enough? 

My air conditioner won't turn on. What's wrong?

Why do the lights dim when the air conditioner starts up? 

Where is the air filter for my central air conditioner and furnace? I can’t find it?

What is causing the outdoor unit (condenser) of my air conditioner to shake? 

My air conditioner outside unit (condenser) won't start and is making a humming noise. What's wrong?

Is it alright to close the air conditioning vents in unused rooms?

My air conditioner won't come on after changing the air filter. What's wrong? 

Why is there a burnt smell when I turn on the heat?

Why does my air conditioner keep shutting itself off?

 Why does the "AUX HEAT" (auxiliary heat) light keep coming on at my thermostat, even when it's not that cold outside? 

 Why does it take so long to cool a house when an air conditioner has been off for a while?  

 How can I fix rooms that are too warm or too cold in my mobile home?

 Will closing doors reduce my heating and cooling costs?

 What is wrong with an air conditioner when the air flow out of the vents is low?

 Why are some rooms colder or warmer than others?

 Why is there mold around the air conditioning vents?

  The coolant line to the outside unit of my air conditioner is frozen. What's wrong?  

 How can I prevent mold in my Florida winter home when I'm gone for the summer? 

• What are the problems with underground return air ducts? 


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