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I am trying to figure out why my air filter in the dining room has turned black on the intake which is in the ceiling. What would cause that to happen. We have electric central air and heat.. Hope...

I rinsed the coils and pushed the red pressure button and it is cooling the house, Finally coming down. The fan is also blowing hot air now. Could I have fixed it? Or should I still have someone...

My central air conditioner has been running for over 3 hours and the temp outside is in the 90's but I have the thermostat set at 79 and the temp is going up instead of down. I went outside to see if...