air conditioners on the roof in arizona

Why Are Air Conditioners on the Roof in Arizona?

If you’re in Arizona, you may be surprised when strolling through your neighborhood, to see air conditioning units perched on the rooftops of houses and buildings. This common sight is not merely an architectural quirk but a strategic response to the scorching temperatures that define Arizona’s climate. So, why are air conditioners on rooftops in Arizona? In this blog post, we will delve into the reasons behind the prevalence of rooftop air conditioning units in Arizona, exploring their benefits, functionality, and maintenance. If you’re curious about the best air conditioning system to equip your home for the battle against the Arizona heat, check out another one of our blog posts.


Why Rooftops AC Units In Arizona?

Arizona’s weather is characterized by extreme heat, with daytime temperatures often soaring between 105℉ to 115℉. Conventional air conditioners installed inside residences struggle to function optimally in such intense heat. The decision to place air conditioning units on the rooftop is rooted in the need for optimal ventilation and circulation.

Rooftop AC units provide efficient cooling by allowing air to be pumped downward toward homes and offices without the need to overcome the resistance of going upstairs. This strategic positioning ensures better results and helps maintain a cool interior even in the face of Arizona’s blistering heat.


Components of Rooftop AC Units

A rooftop air conditioner is essentially a comprehensive package of components enclosed within a single steel chamber. The key components include:

  1. Compressor
  2. Condenser
  3. Condenser Fan
  4. Evaporator Coil
  5. Evaporator Expansion Valves
  6. Check Valves
  7. Blower Fan
  8. Filters
  9. Vibration Eliminators
  10. Drain Pan


How Rooftop AC Units Work

After installation, rooftop AC units operate by allowing a chilled and low-pressure refrigerant to reach the compressor as a gas. The compressor heats the gas, increasing pressure before it flows into the condenser coil. The metal wings on the coil absorb and disperse heat, while the condenser fan blows the exhaust away from the building. Clean air is drawn into the rooftop unit, and warm return air is channeled through ducts for ventilation.


The Benefits of Rooftop Air Conditioners

Energy Efficiency

Rooftop air conditioners efficiently circulate cool air and expel warm air, reducing the frequency of the unit’s operation and lowering overall energy consumption.

Cost Effectiveness

The system is cost-effective, contributing to its popularity among Arizona residents. Lower energy bills result from the unit’s reduced operational frequency.


Installing the AC unit on the rooftop is an excellent choice for those with limited space.

Easy Protection

Rooftop placement minimizes the risk of theft or vandalism, a common concern for ground-based air conditioners.

Minimal Maintenance

Rooftop AC units, being elevated and safer from ground-level dust, require less maintenance, translation to fewer repairs, and increased longevity. In a climate as challenging as Arizona’s where AC systems are under constant stress, giving them the best chance for a long lifespan is wise.

At the end of the day, the reason why air conditioners are on the roof in Arizona is a strategic response to the challenging climate of extreme heat. These units offer numerous advantages, from efficient cooling and increased home equity to easy maintenance and improved health. Whether on the ground or the roof, the choice of AC unit placement depends on individual circumstances, with each option presenting its own set of pros and cons. As residents seek comfort in the face of Arizona’s relentless heat, rooftop air conditioning units stand tall, providing a reliable solution for a cool and comfortable home. If you still have questions about air conditioning solutions in Arizona, check out our numerous blogs on the subject, or feel free to reach out to us!


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