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How to Keep AC Running Smoothly During Arizona Summer

Summer in Arizona is no joke, with temperatures often soaring above 100°F. Keeping your air conditioning (AC) system running smoothly is essential to stay comfortable and avoid costly repairs. This guide will provide you with practical tips and essential information on how to maintain your AC unit effectively. 


From regular maintenance and inspections to optimizing your thermostat settings and ensuring proper insulation, you’ll learn how to keep your AC in top shape all summer long. Let’s dive in and make sure your home stays cool and comfortable during the hottest months.


Photo from iStock – Credit: Makhbubakhon Ismatova

Benefits of Regular AC Checkups

Investing in regular AC checkups can save you time, money, and discomfort. Here are some key benefits:

  1. Improved Efficiency: Regular maintenance keeps your AC running at peak performance, ensuring it cools your home efficiently.
  2. Lower Energy Bills: A well-maintained air conditioning unit uses less energy, leading to lower utility bills.
  3. Extended Lifespan: Regular checkups and timely repairs can significantly extend the life of your AC unit.
  4. Better Air Quality: Clean filters and ducts mean fewer allergens and pollutants in your home.
  5. Preventive Measures: Early detection of issues can prevent costly repairs and unexpected breakdowns.


Preparing Your AC for the Arizona Summer

Pre-Summer Inspection Checklist

Preparing your AC for the intense Arizona summer is essential. Start with a comprehensive inspection to ensure everything is in working order. Here’s a pre-summer inspection checklist to follow:

  1. Check the Thermostat: Ensure it’s working correctly and set to the appropriate temperature.
  2. Inspect the Wiring: Look for any signs of wear or damage.
  3. Examine the Outdoor Unit: Clear any debris and check for damage.
  4. Check the Refrigerant Levels: Low levels can indicate a leak.
  5. Inspect the Ductwork: Look for any leaks or blockages.
  6. Clean the Air Filters: Dirty filters can restrict airflow.
  7. Check the Drain Line: Ensure it’s clear to prevent water damage.


Hiring a Professional vs. DIY Inspection

While DIY inspections can catch some issues, hiring a professional ensures a thorough checkup. Professionals have the tools and expertise to spot problems that might be missed during a DIY inspection. Consider scheduling a professional inspection to guarantee your air conditioning unit is ready for the summer heat.


Old and new air filters for AC on a white background.
Photo from iStock – Credit: Natalia Rusanova

Changing Air Filters Regularly

How Often to Change Air Filters

One of the simplest yet most important maintenance tasks for your AC is changing the air filters. In Arizona’s dusty environment, it’s recommended to change your air filters every 30 to 60 days during peak usage periods. Regularly changing the air filters improves air quality and ensures efficient operation of your air conditioning unit.


Step-by-Step Guide to Changing Air Filters

Changing your air filters is a straightforward process that can be done in a few easy steps:

  1. Turn Off the AC Unit: For safety, make sure your air conditioning unit is turned off before starting.
  2. Locate the Air Filter: Most air filters are found in the return air duct or blower compartment.
  3. Remove the Old Filter: Carefully take out the old filter to avoid spreading dust.
  4. Check the Filter Size: Note the dimensions of the old filter to ensure you buy the correct size.
  5. Insert the New Filter: Place the new filter in the slot, making sure it’s oriented correctly according to the arrows on the filter frame.
  6. Turn the AC Unit Back on: After the new filter is securely in place, turn the unit back on and enjoy improved air quality and efficiency.


Cleaning and Maintaining the Outdoor Unit

Importance of Keeping the Outdoor Unit Clean

The outdoor unit of your AC plays a crucial role in cooling your home. Over time, dirt, leaves, and debris can accumulate around the unit, reducing its efficiency. Keeping the outdoor unit clean helps maintain optimal airflow and prevents the system from overheating, ensuring your AC runs smoothly throughout the hot Arizona summer.


Tips for Cleaning the Outdoor Unit

Here are some practical tips for cleaning your AC’s outdoor unit:

  1. Turn Off the Power: Before you start cleaning, make sure to turn off the power to the unit at the breaker box.
  2. Remove Debris: Clear away leaves, twigs, and any other debris around the unit. Trim back any vegetation at least two feet from the unit.
  3. Clean the Fins: Use a soft brush or a fin comb to gently clean the fins. Be careful not to bend them.
  4. Hose Down the Unit: Use a garden hose to wash away dirt and grime from the fins. Spray from the inside out to avoid pushing debris further into the unit.
  5. Check the Fan: Inspect the fan for any damage and ensure it spins freely.
  6. Reassemble and Restore Power: Once everything is clean and dry, reassemble any parts you removed and restore power to the unit.


Checking and Cleaning the Indoor Unit

Dusting and Vacuuming the Indoor Unit

Maintaining the indoor unit of your AC is just as important as the outdoor unit. Dust and dirt can accumulate inside the unit, affecting its efficiency and air quality. Regular cleaning ensures optimal performance and a healthier indoor environment.

  1. Turn Off the Power: Always start by turning off the power to the unit to ensure safety.
  2. Remove the Access Panel: Depending on your unit, you may need a screwdriver to remove the panel.
  3. Dust the Components: Use a soft cloth or brush to dust the components gently. Pay special attention to the evaporator coils and blower fan.
  4. Vacuum the Interior: Use a vacuum with a brush attachment to clean the interior parts, including the evaporator coils. This helps remove any accumulated dirt and dust.
  5. Check the Condensate Drain: Ensure the drain is clear to prevent water damage and mold growth.


Preventing Mold and Mildew Buildup

Mold and mildew can thrive in the moist environment of your air conditioning unit, leading to health issues and unpleasant odors. Here’s how to prevent buildup:

  1. Keep the Drain Line Clear: Regularly check and clean the condensate drain line to prevent blockages.
  2. Use a Mold Inhibitor: Apply a mold inhibitor spray on the evaporator coils to reduce the risk of mold growth.
  3. Maintain Humidity Levels: Use a dehumidifier to maintain indoor humidity levels below 60%, making it less conducive for mold and mildew growth.
  4. Ensure Proper Ventilation: Keep your home well-ventilated to reduce moisture levels.


Thermostat Settings and Optimization

Best Thermostat Settings for Arizona Summers

Setting your thermostat correctly can make a significant difference in both comfort and energy savings during the scorching Arizona summers. Here are some optimal settings to consider:

  1. Daytime Settings: Keep the thermostat set to around 78°F when you’re at home. This balance ensures comfort without overworking your air conditioning.
  2. Nighttime Settings: At night, you can lower the temperature slightly, to around 74-76°F, for comfortable sleeping conditions.
  3. Away from Home: When you’re away for extended periods, set the thermostat to 85°F to save energy while ensuring the house doesn’t get too hot.


How to Use Programmable Thermostats Effectively

Programmable thermostats are a fantastic tool for optimizing your home’s cooling system. Here’s how to use them effectively:

  1. Create a Schedule: Program your thermostat to adjust temperatures according to your daily routine. For instance, set it to cool the house before you wake up and before you return home from work.
  2. Utilize Vacation Settings: Most programmable thermostats have a vacation mode. Use this feature to maintain higher temperatures when you’re away, saving energy and costs.
  3. Take Advantage of Smart Features: Modern thermostats offer smart features like remote control via smartphone apps, energy usage reports, and learning capabilities that adjust settings based on your preferences and habits.
  4. Avoid Frequent Adjustments: Constantly changing the thermostat settings can lead to inefficiency. Stick to a consistent schedule for the best results.


Ensuring Proper Insulation

Importance of Insulation in Maintaining AC Efficiency

Proper insulation is crucial for keeping your home cool and your AC running efficiently during the hot Arizona summers. Insulation helps maintain a consistent indoor temperature, reduces the workload on your air conditioning, and lowers energy bills. Without adequate insulation, your air conditioning unit has to work harder to keep your home cool, leading to higher energy consumption and potential wear and tear.


Tips for Improving Home Insulation

Enhancing your home’s insulation can lead to significant energy savings and improved comfort. Here are some tips:

  1. Insulate Attics and Walls: Ensure your attic and walls are properly insulated to prevent heat from entering your home.
  2. Seal Gaps and Cracks: Use weatherstripping and caulk to seal gaps around windows, doors, and other openings to prevent cool air from escaping.
  3. Upgrade Windows: Consider installing double-pane or energy-efficient windows to reduce heat transfer.
  4. Use Reflective Insulation: In areas with intense sunlight, reflective insulation can help reflect heat away from your home.
  5. Insulate Ductwork: Ensure your ductwork is well-insulated to maintain cool air as it travels through your home.


Sealing and Insulating Ductwork

Identifying Leaks in Ductwork

Leaky ducts can significantly reduce the efficiency of your air conditioning system, leading to higher energy bills and uneven cooling throughout your home. Identifying and sealing leaks in your ductwork is essential for optimal performance. Here are steps to identify leaks:

  1. Visual Inspection: Look for visible gaps, disconnected joints, and damaged sections of ductwork.
  2. Listen for Air Leaks: Turn on your AC and listen for hissing or whistling sounds indicating air escaping.
  3. Check for Dust Accumulation: Excessive dust around your vents can be a sign of leaks in the ducts.
  4. Use a Smoke Test: Light a stick of incense and hold it near the ducts. If the smoke wavers, you likely have a leak.
  5. Professional Inspection: Consider hiring a professional for a thorough inspection using specialized tools and techniques.


How to Properly Seal and Insulate Ducts

Once you’ve identified leaks, it’s important to properly seal and insulate your ductwork. Follow these steps:

  1. Turn Off the AC: Ensure your system is turned off before beginning any work.
  2. Clean the Ducts: Wipe down the areas you’ll be sealing to ensure a good bond.
  3. Apply Mastic Sealant or Foil Tape: Use mastic sealant or HVAC foil tape to seal leaks. Avoid using duct tape, as it doesn’t hold up well over time.
  4. Insulate the Ducts: Wrap the ducts with duct insulation to prevent energy loss. Secure the insulation with foil tape or zip ties.
  5. Check Your Work: After sealing and insulating, turn the air conditioning back on and check for any remaining leaks.


Checking Refrigerant Levels

Signs of Low Refrigerant Levels

Low refrigerant levels can severely impact your AC’s performance, causing it to run inefficiently and struggle to cool your home. Here are some signs that your air conditioning might be low on refrigerant:

  1. Reduced Cooling Efficiency: If your air conditioning isn’t cooling as effectively as it used to, low refrigerant could be the culprit.
  2. Longer Cooling Cycles: The unit runs longer to reach the desired temperature.
  3. Ice on the Evaporator Coils: Frost or ice buildup on the coils is a common sign of low refrigerant.
  4. Hissing or Bubbling Noise: These sounds may indicate a refrigerant leak.
  5. Higher Energy Bills: An increase in energy costs without a corresponding increase in usage can signal a problem.


How to Refill Refrigerant Safely

Refilling refrigerant is a task that requires caution and precision. It’s often best left to professionals, but if you’re knowledgeable about HVAC systems, here’s a basic guide:

  1. Turn Off the AC: Ensure the system is turned off before you start.
  2. Wear Protective Gear: Use gloves and safety glasses to protect yourself.
  3. Attach the Gauges: Connect a set of manifold gauges to the air conditioning system to measure the refrigerant pressure.
  4. Check the Current Levels: Compare the pressure readings with the recommended levels for your system.
  5. Add Refrigerant: If levels are low, slowly add the appropriate refrigerant type. Follow the manufacturer’s instructions and ensure you don’t overfill.
  6. Monitor the Pressure: Keep an eye on the gauges to make sure you’re adding the correct amount.
  7. Check for Leaks: After refilling, check the system for leaks using a leak detector or soap solution.


Regular Professional Maintenance

Benefits of Scheduled Professional Maintenance

Regular professional maintenance is vital to keep your AC running smoothly, especially in the harsh Arizona climate. Here are some benefits of scheduling professional maintenance:

  1. Increased Efficiency: Professionals can optimize your system to run more efficiently, reducing energy consumption.
  2. Prolonged Lifespan: Regular checkups can extend the life of your air conditioning unit by preventing major issues.
  3. Enhanced Performance: Maintenance ensures your air conditioning performs at its best, providing consistent cooling.
  4. Reduced Repairs: Early detection of potential problems can prevent costly repairs down the line.
  5. Improved Air Quality: Regular cleaning and maintenance help keep the air in your home clean and free from allergens.


What to Expect During a Professional AC Tune-Up

A professional AC tune-up is a comprehensive service that ensures your system is ready for the demanding summer months. Here’s what to expect during a tune-up:

  1. Inspection of Components: Technicians will inspect all the major components of your air conditioning, including the compressor, evaporator coil, condenser coil, and fans.
  2. Refrigerant Check: They will check and adjust refrigerant levels, ensuring there are no leaks.
  3. Thermostat Calibration: The thermostat will be calibrated to ensure accurate temperature control.
  4. Cleaning: Both indoor and outdoor units will be cleaned to remove dirt, debris, and potential blockages.
  5. Lubrication: Moving parts will be lubricated to reduce friction and prevent wear and tear.
  6. Electrical Connections: All electrical connections will be checked and tightened to ensure safety and efficiency.
  7. Performance Test: The system will be tested to ensure it’s operating correctly and efficiently.


Using Ceiling Fans to Enhance Cooling

How Ceiling Fans Can Improve AC Efficiency

Ceiling fans can be a great asset in enhancing your AC’s efficiency, especially during the hot Arizona summer. By promoting better air circulation, ceiling fans can help distribute cool air more evenly throughout your home. This can allow you to set your thermostat a few degrees higher without sacrificing comfort, leading to significant energy savings.


Optimal Fan Settings for Summer

To maximize the cooling benefits of ceiling fans, it’s important to use them correctly:

  1. Set Fans to Rotate Counterclockwise: During the summer, your ceiling fans should rotate counterclockwise to create a wind-chill effect. This pushes cool air down and helps to evaporate sweat, making you feel cooler.
  2. Adjust the Speed: Use a higher speed setting on particularly hot days to enhance the cooling effect.
  3. Turn Off When Not in Use: Ceiling fans cool people, not rooms. Turn off fans in unoccupied rooms to save energy.
  4. Combine with AC: Use ceiling fans in conjunction with your air conditioning to maintain a comfortable environment while allowing you to raise your thermostat setting by a few degrees.


Keeping Vents Clear and Open

Importance of Unobstructed Vents

Ensuring that your air vents are clear and open is crucial for maintaining efficient airflow and cooling in your home. Blocked or closed vents can strain your air conditioning system, reduce its efficiency, and create uneven cooling throughout your house. By keeping vents unobstructed, you help your air conditioning run more effectively and improve overall comfort.


Tips for Ensuring Proper Airflow

  1. Regularly Check Vents: Make it a habit to check all vents in your home to ensure they are open and free of obstructions.
  2. Avoid Blocking Vents: Keep furniture, curtains, and other objects away from vents to allow for proper airflow.
  3. Clean Vents Regularly: Dust and debris can accumulate in vents over time. Use a vacuum or a damp cloth to clean them periodically.
  4. Adjust Louvers: Louvers can direct airflow. Ensure they are positioned to distribute air evenly throughout the room.
  5. Inspect Ductwork: Regularly check ductwork for any blockages or leaks that might impede airflow.



  1. How Often Should I Service My AC in Prescott, AZ?

    It’s recommended to service your air conditioning at least once a year, preferably before the summer season starts, to ensure optimal performance and efficiency.

  1. What are Common AC Issues in Prescott, AZ?

    Common issues include low refrigerant levels, dirty filters, blocked ducts, and malfunctioning thermostats. Regular maintenance can help prevent these problems.

  1. How Can I Improve My AC’s Efficiency in Arizona’s Climate?

    Regular maintenance, changing filters, cleaning units, and using programmable thermostats can significantly improve your AC’s efficiency.

  1. Why is My AC Freezing Up During Summer?

    This can be due to low refrigerant levels, restricted airflow from dirty filters, or a malfunctioning blower fan. It’s best to consult a professional if this occurs.

  1. Can I Perform AC Maintenance Myself?

    While you can handle basic tasks like changing filters and cleaning units, professional maintenance is recommended for a thorough inspection and handling complex issues.



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