If you're a new homeowner in Arizona, you might have already noticed something unique about the HVAC systems in the desert southwest: the air conditioning (AC) units are often located on the roof. If you're unfamiliar with this setup, you're not alone. It's a distinct feature of many homes in the desert climate, and it can seem unusual if you come from an area where outdoor AC units are typically on the ground. But why are HVAC units on the roof in Arizona, and what benefits does this setup provide in a desert climate?

When your rooftop AC requires maintenance or repairs, call One Hour Heating & Air Conditioning® of Yuma at (928) 218-3797.

Four Reasons Why Your HVAC Is on the Roof

Arizona is famous for its scorching summers, with temperatures regularly soaring above 100°F. In such extreme heat, air conditioning is not just a luxury—it’s essential for staying comfortable and healthy. A good HVAC system is crucial for maintaining an optimal indoor temperature. In this context, placing the AC unit on the roof has practical advantages.

  1. Space Considerations

One reason HVAC units are placed on the roof in Arizona is simply due to limited ground space, especially in suburban and urban areas. Arizona's landscapes often feature compact residential lots, where space is at a premium. When an AC unit is on the roof rather than the ground, homeowners can maximize their outdoor living space and the curb appeal of their property. The roof location keeps AC equipment out of sight, providing a cleaner, more open yard or patio area.

  1. Efficiency and Airflow

An important consideration when installing HVAC systems is the ability to maintain good airflow. When an AC unit is on the roof, it tends to have better airflow compared to a ground-mounted unit. On the roof, the unit can receive better circulation from the surrounding environment, helping it to cool more efficiently. Additionally, the hot air exhausted by the AC has a better chance of dispersing quickly, rather than getting trapped around a unit that's located close to the ground.

In desert climates like ours, where cooling demands are high, ensuring good airflow can control energy consumption and lower utility bills. A rooftop installation can also reduce the amount of dirt and debris choking the system, which is especially important in a dusty desert environment.

  1. Protection from Monsoon Flooding

Arizona is known for its monsoon season, which brings heavy rainfall and occasional flooding to certain areas. An AC unit on the roof can help protect the system from potential flood damage. If the unit is placed on the ground, heavy rain can easily cause water damage to the HVAC system, potentially leading to costly repairs or replacements. By positioning the unit on the roof, it remains elevated, reducing the risk of water infiltration and prolonging its lifespan.

  1. Noise Reduction

An AC unit on the roof can also help with noise reduction. HVAC systems can be noisy, and placing them on the roof often minimizes the sound heard inside the house. If you enjoy relaxing or hosting events outside, the noise from a ground-based unit can be disruptive. Roof installations tend to result in quieter operation.

Maintenance and Safety Considerations

When considering having an AC unit on the roof vs. the ground, rooftop units do require special consideration when it comes to maintenance. Since the system is located on your roof, it may be more difficult for technicians to access. Some homeowners might need to take extra steps to ensure that the roof is safely accessible for routine inspections and repairs. However, Arizona’s HVAC professionals are well-trained in rooftop installations and can perform maintenance tasks effectively.

Choose One Hour Heat & Air of Yuma for Rooftop AC Services

If you’re new to Arizona, you might find it interesting that HVAC units are often placed on the roof in this desert state. While there are some challenges when it comes to accessing rooftop units for servicing, the benefits of a rooftop HVAC installation often outweigh the drawbacks in Arizona’s unique climate. As a new homeowner in the desert, understanding why HVAC units are on the roof in Arizona can help you appreciate the thoughtful design and function of your home's cooling system.

Now you know why your AC is on your roof and why it’s working so well to keep your home cool in the desert heat. When that’s no longer the case and your rooftop air conditioner needs professional service, turn to the experts at One Hour Heating & Air Conditioning® of Yuma. Our HVAC technicians are trained, experienced, and background-checked to ensure your safety and satisfaction.

Getting started is easy – simply schedule an appointment online.

Air Conditioner FAQs

How to clean an AC unit on the roof:

Due to the safety hazards associated with climbing onto your house’s roof, we recommend having your rooftop AC cleaned by an HVAC professional every spring.

How long do AC compressors last on the roof?

Rooftop units are designed to withstand the desert elements, so the typical 15-20 year lifespan of other central air conditioner units still applies. However, it’s worth noting that expert installation and routine maintenance will help the unit run efficiently and could extend its life.

How to lift an AC unit on a roof:

The most common way to install an AC unit on a home’s roof is to lift it up with a crane. Your HVAC installation company will coordinate this service for you.

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