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What is Head Pressure in HVAC

Melbourne, a city known for its unpredictable weather, experiences both scorching summers and chilly winters. HVAC systems play an important part in our day-to-day life as residents of Melbourne. We need our HVAC system running throughout the year to remain comfortable inside our homes. Whether it’s a hot summer day or a chilly winter night, the HVAC system has to operate in order to maintain the desired temperature in our homes. To ensure the optimal performance and longevity of your HVAC unit throughout these seasons, regular maintenance is essential. At DGB Refrigeration Heating & Cooling, we understand the significance of keeping your HVAC system in top shape. In this article, we will explore the importance of HVAC maintenance, common issues such as head pressure, and how our professional services can help Melbourne residents enjoy reliable and efficient cooling and heating.

Understanding Head Pressure

Head pressure is a term unfamiliar to many homeowners, yet it plays a crucial role in HVAC systems. Head pressure is generated by the gas compressor within your air conditioning unit. While it is normal for the head pressure to fluctuate within a specific range, exceeding these limits can indicate a problem. Detecting high head pressure requires the expertise of a licensed air conditioning service team, like DGB Refrigeration Heating & Cooling.

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Determining High Head Pressure

For a 410A system, the normal high side pressure ranges between 400 and 418 PSIG, while the low side pressure should be around 120-130 PSI. Any pressure exceeding these values is considered high. However, it’s important to note that head pressure can also be influenced by weather conditions and other factors.

What Are the Symptoms of High Head Pressure?

There are a number of symptoms that can indicate that your HVAC system has high head pressure, including:

  • Reduced cooling capacity
  • Increased energy consumption
  • Noisy compressor
  • Condensate dripping from the condenser coils
  • Damage to the compressor

If you notice any of these symptoms, you should contact a qualified technician to have your HVAC system checked.

Causes of High Head Pressure

Maintaining lower head pressure is essential to prevent damage to your HVAC system, particularly when combined with low suction. Several factors can contribute to high head pressure, including:

Dirty Condenser Coils: Regularly cleaning and removing debris from your coils through a simple maintenance plan can prevent high head pressure.

Faulty Fan Motor: A worn-down or malfunctioning outside fan motor is a common cause of increased head pressure. Similarly, a non-functioning or slowed condenser fan can have adverse effects.

Refrigerant Issues: Leaking refrigerant can lead to higher head pressure, indicating a problem within the HVAC’s refrigerant system.

Improper Installation: Incorrectly connecting lines during a DIY project can result in non-condensing gas and increased head pressure. It’s crucial to rely on professional repair services like DGB Refrigeration Heating & Cooling to ensure correct installation and prevent such issues.

Low ambient temperature: When the ambient temperature is low, the condenser coils will not be able to dissipate as much heat. This will cause the pressure to increase.

Oversized compressor: If the compressor is too large for the system, it will not be able to efficiently circulate the refrigerant. This will also cause the pressure to increase.

Effects of High Head Pressure

When head pressure exceeds normal limits, it can cause various symptoms. If head pressure is too high, it can cause a number of problems, including: 

  • Increased evaporator flash gas
  • Higher suction pressure
  • Fluttering pressure on the suction side
  • Noise from the system
  • Condenser piping leakage
  • Reduced cooling efficiency
  • Higher utility bills
  • Increased energy consumption
  • Damage to the compressor
  • Energy wastage

If you suspect that your HVAC system has high head pressure, you should dial 03 7038 6918 to contact DGB Refrigeration Heating & Cooling and have it checked.

How to Fix High Head Pressure?

If your HVAC system has high head pressure, there are a number of things that can be done to fix the problem, including:

  • Recharge the refrigerant: If the refrigerant level is low, it will need to be recharged.
  • Clean the condenser coils: If the condenser coils are clogged, they will need to be cleaned.
  • Install a dehumidifier: If the ambient temperature is low, a dehumidifier can be installed to help remove moisture from the air.
  • Replace the compressor: If the compressor is too large or damaged, it will need to be replaced.

The Importance of Regular Maintenance

Neglecting regular HVAC maintenance often leads to breakdowns and expensive repairs. By investing in routine maintenance, including addressing head pressure concerns, you can enjoy several benefits:

Enhanced Efficiency: Regular servicing optimizes the performance of your HVAC system, resulting in improved energy efficiency and lower utility bills.

Extended Lifespan: Well-maintained units tend to have a longer lifespan, saving you from premature replacements.

Cost Savings: Early detection and resolution of issues through maintenance can prevent major breakdowns and costly repairs.

Improved Air Quality: Cleaning or replacing filters and maintaining clean coils ensures better indoor air quality, promoting a healthier living environment.

When to Call a Professional

It is essential to seek professional assistance whenever your HVAC system requires attention. DGB Refrigeration Heating & Cooling recommends prompt action to prevent increased electricity consumption and discomfort due to an inefficient HVAC unit. We are your most reliable and reputable technicians for your HVAC repair and service. You can reach out to us by dialling 03 7038 6918 and we will be happy to serve you.


Regular HVAC maintenance is crucial for the residents of Melbourne, considering the city’s diverse climate and weather fluctuations. With DGB Refrigeration Heating & Cooling’s expert services, homeowners can ensure their HVAC units are in optimal condition throughout the year. We strive to deliver reliable cooling and heating, improved energy efficiency, and cost savings by addressing issues like head pressure and providing comprehensive maintenance. Don’t overlook the importance of routine HVAC maintenance—invest in the longevity and performance of your system today. Grab your phone today and dial 03 7038 6918 to book a call out or service for your HVAC system.

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