Why is My Upstairs AC Not Cooling?

There can be several reasons why does AC not cool upstairs. The HVAC unit's location on the first floor is one of the primary problems. Warm air is drawn in by HVAC systems, which then distribute cool air throughout the house. The system must work harder to force air upstairs if the unit is located downstairs since cool air tends to sink to the floor, making it more difficult to effectively cool the upper floors.

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Why My AC Doesn’t Cool Upstairs?

The possible reasons why AC doesn’t cool upstairs are:

1. Cooling the upstairs space is a challenge for the first-floor unit. Verify that there are no vent leaks, as this results in the loss of cool air.

2. When filters are clogged, airflow is reduced, which lowers cooling effectiveness. Replace and inspect them frequently.

3. Zoning systems may require adjusting, or the thermostat may be set excessively high. The temperature is usually higher upstairs as the hot air rises.

4. If your air conditioner is leaking refrigerant, it will be unable to cool effectively. It has to be inspected and refilled by an expert.

5. If the upstairs isn't well-insulated, cool air may escape, making the room warmer.

Now that you know the reasons behind why your AC is not cooling upstairs, let me tell you that it is best that you hire a professional who can thoroughly inspect and solve the problem.

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What to Do If Central AC is Not Cooling: 5 Method

Hi buddy. One main reason why is my upstairs AC not cooling is the dirty air filter. This I came to know, when last summer, I faced trouble sleeping because of the intense summer heat. Even worse, when my air conditioner did not work upstairs and my room was on the second floor. I learnt common reasons and remedies for upstairs air conditioning problems from the expert I hired to fix my AC. I have added the same below for your reference.

Why Does AC Not Cool Upstairs?

Here are the reasons and solutions the professional informed me.

Dirty Air Filter

Dust and debris buildup in the air filter can restrict airflow and make it more difficult for cool air to move throughout your house. Your upstairs may feel warmer than usual because of this. You can solve this by changing the air filter, which will increase air flow and make your air conditioner cool more effectively.

Hot Roof

The sun’s heat being absorbed by uninsulted roofs causes the second floor heat. Uncomfortable hot air can also pass via the attic. So, the technician said efficient operation of your air conditioner and a cool home depend on attic insulation.

Single AC System or Thermostat

A two-story house without a modern air conditioning system can have a single thermostat. It only detects the temperature in one room, leaving other rooms, especially the first floor warm. So, to fix it, you must hire a technician.

In my case, it happened because of the dirty air filter. I hope you understand why is AC not cooling upstairs.

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