Should an Outdoor AC Unit Be in the Shade

When the weather’s hot, standing in the shade helps you keep cool. As a homeowner, it’s only natural to wonder if using the same mechanism to shade your AC can do the same thing for your home. While shading the outdoor unit can help a bit, routine maintenance, good airflow, clearance, and home shading normally make a larger difference. By understanding how your outdoor unit works, whether shade saves energy, and some important efficiency tips, you can optimize your AC’s performance and efficiency.

What Does the Outdoor AC Unit Actually Do?

The outdoor unit contains the condenser coil, which releases heat that was pulled from inside your home. For this to happen, the unit needs open space to pull in outdoor air and push hot air away. Your unit’s performance depends heavily on whether it has adequate airflow.

Does Shade Help an Outdoor AC Unit Run Better?

Because an AC condenser works more efficiently with cooler outdoor air, shading a sufficiently large area around the unit can theoretically provide a small efficiency benefit. Direct sunshine can warm up the cabinet and the surrounding area, increasing the temperature of the air pulled into the unit.

Shading the unit alone is generally not enough to make any significant efficiency gain. You would also need to shade the surrounding area so that nearby air pulled into the unit is also cooler. In addition, shade will only help with energy efficiency if it does not block the unit’s ventilation.

The Bigger Issue: Airflow Matters More Than Shade

Ultimately, the airflow around the unit matters significantly more than how shaded it is. A shaded unit can still perform poorly if it’s boxed in by shrubs, fences, walls, or covers. The hot air in the unit must be able to escape up and away. Otherwise, the condenser may end up recirculating its own hot discharge air, resulting in a decline in cooling performance and increased strain on your AC.

When Shade Can Be Helpful

There are some situations where shade can help to cool your unit and boost your energy efficiency without negatively impacting airflow. For example, natural shade from trees or landscaping that does not affect clearance around the unit can help. A detached awning, breathable screen, or pergola can also be useful if there is plenty of open space. 

If you’re getting a new unit installed, you can also set it up on a side of the home that receives less afternoon sun. However, there are other factors that determine where an installation should go, so this placement location isn’t always the best option. 

When Shade Can Hurt Your AC

In some cases, shade can end up hurting your AC’s performance and efficiency. Solid covers that are placed directly over the unit, tight fencing, tarps, umbrellas, and makeshift covers can trap heat and limit airflow. Similarly, overgrown shrubs next to the condenser can reduce airflow and increase the likelihood that leaves get into the unit. In essence, any setup that blocks the fan or limits air movement around the coil can harm your AC.

How Much Clearance Does an Outdoor AC Unit Need?

Clearance requirements for outdoor AC units vary by manufacturer and model, although 2 to 3 feet of open space around landscaping is a common recommendation. Outdoor units rely on airflow for heat exhaust. If this airflow is lacking, it creates a strain on the unit and can reduce its performance. Because each manufacturer has specific guidance on clearance, it’s a good idea to consult with your manufacturer’s installation guidelines or talk to one of our heating, ventilation, and air conditioning (HVAC) technicians.

Signs Your Outdoor AC Unit May Be Struggling

Your AC may be struggling if you notice any of the following symptoms.

• The AC takes longer than usual to cool your home.
• Your system seems to run constantly. 
• There is an unusual humming or buzzing sound.
• The AC’s normal noises are louder than usual.
• Your energy bills have gone up without a corresponding increase in usage.
• There is warm air coming from your indoor vents during the hottest part of the day.
• The breaker keeps tripping.
• Your AC keeps shutting down during periods of peak heat.
• The outdoor unit feels unusually hot.

Better Ways To Use Shade for Cooling Savings

To improve your energy efficiency using shade, remember the following best practices.

Shade the Home, Not Just the Unit

Rather than solely shading the unit, you can reduce heat gain by shading more of your home. This can directly lower the AC’s workload. You can start by planting trees around your home or setting up awnings to decrease sun exposure on your windows and walls. In particular, focus on reducing exposure on your west- and south-facing windows.

Reduce Heat Around the Outdoor Unit

Anything that reduces airflow or increases heat can make your outdoor unit hotter. For example, you should avoid locations where nearby walls, pavement, or tight corners can cause excessive heat buildup or interfere with airflow. To ensure proper airflow, the landscaping should be regularly trimmed, and items should not be stored near the unit.

Keep the Condenser Clean

Another way to boost airflow is by regularly removing leaves, grass clippings, and debris that are near the condenser unit. The coils should be kept as clear as possible. Before summer arrives, schedule professional maintenance so that the outdoor coil can be cleaned and inspected.

Should You Move an Outdoor AC Unit Into the Shade?

Relocating a condenser unit can be costly and is rarely worth the expense for shade alone. However, you may want to move the unit if the current location has poor airflow, drainage problems, excessive heat buildup, or service-access issues. If you think your unit may need to be moved, one of our HVAC technicians can evaluate the current AC placement to help you decide.

Common AC Shade Mistakes To Avoid

To keep your AC functioning at its best, avoid making the following mistakes.

• Do not build a tight enclosure around the unit.
• Do not allow plants to grow too close to the condenser unit.
• Do not cover the top of the AC while it is running.
• Do not ignore the manufacturer’s clearance requirements.
• Do not assume that adding shade will solve an old, dirty, undersized, or badly maintained AC.

FAQs

Is it bad for an outdoor AC unit to be in direct sunlight?

Although direct sunlight generally isn’t harmful to your outdoor unit, it can increase your energy costs slightly. Your outdoor AC unit was designed to work outdoors, so it can handle the sunshine. The bigger factor is how much air is moving through the unit and helping to transfer heat.

Does shading an AC condenser lower energy bills?

Shading an AC condenser might lower energy bills slightly, but it won’t be a major difference. While the results can vary, studies have generally found that shading only results in a moderate difference. Part of this is likely because ACs draw in significantly more air than is available in the shaded area. Due to the warm, unshaded air, the impact of shading the unit is reduced.

Can I put a cover over my AC unit in summer?

In general, you should not cover an AC unit while it is operating because a cover can restrict airflow, cause the unit to overheat, and potentially damage components. Eventually, the restricted airflow can damage the compressor and lead to costly repairs.

What is the best side of the house for an outdoor AC unit?

The north or east side of the house will generally have the least sun exposure. However, you should also consider factors like airflow and clearance around the unit. The unit’s proximity to your living areas and bedrooms may also be a factor because of the noise produced.

Should shrubs be planted around an AC unit?

While shrubs should not be planted right next to the unit, they can be planted near it. To maintain proper airflow, follow the manufacturer’s clearance requirements. Many manufacturers recommend keeping shrubs roughly 2 to 3 feet away from the unit.

Is maintenance more important than shade?

Routine maintenance is essential for protecting your equipment, improving your energy efficiency, and preventing costly repairs. Routine HVAC maintenance generally has a much greater impact on long-term system performance than shading the outdoor unit.

Optimize Your AC for Summertime Comfort

Although shade can deliver marginal energy improvements, it is not a magical fix for your AC’s energy efficiency. If you want to improve your AC’s energy efficiency by shading the unit, it’s essential to maintain proper airflow and clearance around the unit. Additionally, routine maintenance and coil cleaning will help protect your AC.

Schedule routine AC maintenance and optimize your cooling efficiency by reaching out to Fox Family Heating & Air Conditioning today.