Do you want to know why are Ac units on the roof in Arizona? No more worries. Let’s explore the query in detail.

In Arizona, air conditioner units are mostly seen on the rooftop. As it is a hot place, the air conditioner units require optimal circulation as well as ventilation.

Furthermore, without needing to go upstairs, the air might be pumped immediately downwards towards the homes and offices. As a result, air conditioners can deliver a better result and efficiently keep the house cool.

Continue reading to learn more about the question.

Why Are Ac Units On The Roof In Arizona

Why Are Ac Units On The Roof In Arizona?

Actually, this is the most cost-effective and energy-efficient way to keep the inside cool during hot weather. 

Arizona’s weather is scorching, with daytime temperatures ranging from 105 to 115 degrees Fahrenheit. Air conditioners installed inside the residence cannot function correctly at this temperature. As a result, the rooftop is equipped with proper ventilation and circulation.

Rooftop air conditioners are widely used in Arizona. Now, let see what are components of a rooftop Ac unit are below:

  • Compressor
  • Condenser
  • Condenser Fan
  • Evaporator Coil
  • Evaporator Expansion Valves
  • Check Valves
  • Blower Fan
  • Filters
  • Vibration Eliminators
  • Drain Pan

It is basically a complete package of Ac units inside a single steel chamber.

Now I will let you know how the Ac units work on the roof. That will let you know the answer to your query.

After installing the Ac units on the rooftop, a chilly and reduced pressure refrigerant reaches the compressor as a gas. There the gas becomes heated and turns into high pressure before flowing into the condenser coil. 

Then, the heat is absorbed and dispersed by the metal wings on the coil, and the exhaust is blown away from the building by the condenser fan. Clean air reaches the rooftop unit while warm return air goes via the ducts for ventilation.

Air filters are positioned above the return ductwork to minimize impurities from dropping on the cooling systems. As a result, the rooftop Ac unit removes the heat and keeps the interior cold.

You will be surprised to know that there are also some other benefits of installing Ac units on the roof in Arizona. Let’s check them.

Energy efficient

Rooftop air conditioners are energy-efficient as they efficiently disseminate cool air and expel warm air, reducing the frequency with which the unit runs and so lowering your energy use.


Since the system is also cost-effective, it is more popular among Arizona residents. The cost is lower than previously as it minimizes your energy bill.


When you have limited space in your house, it would be the best decision for you to install the Ac unit on the rooftop.

Easy protection

Since an air conditioner is expensive and contains numerous critical components, it can be stolen at any time if it is installed on the ground. Installing it on the roof to secure your investment is a good move.

Healthy lifestyle

It promotes a healthy lifestyle. Due to Arizona’s warm and dry weather conditions, dirt and debris levels are frequently higher. These compounds have an impact on the quality of your air, which can cause health complications. 

Adult asthma is more common in areas with poor air quality, and safeguarding the overall health is easier when your air quality is good.

Minimal repairments

As the air conditioner of the rooftop is safe from dust rather than the ground one, it requires less maintenance.

This sort of air conditioner is simple to maintain. Here are some recommendations for keeping this machine in good working order.

  • Replace your system’s indoor filters on a regular basis.
  • Examine the exterior of the air conditioning system.
  • Clean the coils on both evaporators as well as condensers.
  • Toughening the bet
  • Inspect the fan and the inlet screen on a regular basis.

For such benefits, the Ac units are mostly mounted on the roof in Arizona.


I hope now you know a lot about rooftop air conditioning units. So you are not more confused about the query: why are ac units on the roof in Arizona? 

A rooftop system does not need to force air into a home due to the principles of the physics of cooler air. The air goes automatically downwards to keep the house cool. It also aids in the removal of hot air from the interior of the house during hot weather.

As a reason, if you live in Arizona, rooftop air conditioners are your best bet.

Best of luck.


As a civil engineer and roofer, I love to share the experience that I have gained through the last couple of years. In the roofing industry, practical experience is a very crucial fact that can help you a lot. Hence, I want to help you with my blog.

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