What is AHU Capacity?

AHU capacity refers to the amount of air an Air Handling Unit (AHU) can condition and distribute within a building. It’s essentially a measure of the AHU’s ability to handle airflow. There are two main ways to express AHU capacity:

  1. Airflow Rate: This is typically measured in Cubic Feet per Minute (CFM) or Cubic Meters per Hour (CMH). It represents the volume of air the AHU can move within a given timeframe. Higher CFM or CMH indicates a greater capacity to circulate air.

  2. Cooling Capacity: This is measured in tons of refrigeration (TR) or kilowatts (kW) of cooling. It reflects the AHU’s ability to remove heat from the air it processes. A higher TR or kW rating signifies a greater capacity for cooling the conditioned air.

Choosing the right AHU capacity depends on several factors:

  • Building size and layout: Larger buildings or those with complex layouts will require AHUs with higher airflow rates.
  • Occupancy level: Buildings with more occupants will generate more heat, requiring AHUs with greater cooling capacity.
  • Desired indoor temperature and humidity: Maintaining lower temperatures or more controlled humidity levels might necessitate a higher capacity AHU.
  • Fresh air requirements: If a significant amount of fresh air needs to be introduced, the AHU will need sufficient capacity to handle that additional airflow.

Here are some additional points to consider regarding AHU capacity:

  • Static pressure: This refers to the air pressure required to overcome resistance within the ductwork system. AHUs are also rated for their available static pressure, which should be sufficient to overcome the pressure drop in the specific duct system design.
  • AHU selection process: Selecting the right AHU capacity involves careful calculations considering all the factors mentioned above. Consulting with an HVAC engineer is recommended to ensure you choose an AHU that meets your building’s specific needs efficiently.

What are the four 4 main types of HVAC Systems?

The four main types of HVAC systems are:

  1. Split Systems: These are the most common type of residential HVAC system. They consist of two main units:

    • Outdoor unit (condenser): Located outside the building, it houses the compressor that pressurizes the refrigerant and the condenser coil that releases heat to the outdoors.
    • Indoor unit (air handler): Located inside the building, it houses the evaporator coil that absorbs heat from the air and a blower fan that circulates conditioned air throughout the building. Split systems can be either heat pump systems (providing both heating and cooling) or air conditioning only systems.
  2. Hybrid Split Systems: These systems combine a gas furnace with an electric air conditioner. They offer the efficiency of electric cooling in moderate temperatures and the reliability of gas heat during colder periods. The system automatically switches between the electric and gas components based on efficiency and outdoor temperature.

  3. Ductless Mini-Split Systems: These systems are similar to split systems but eliminate the need for ductwork. They consist of an outdoor unit connected to one or more indoor units mounted on walls or ceilings. This makes them ideal for renovations or buildings without existing ductwork.

  4. Packaged Heating and Air Conditioning Systems: These systems combine all the necessary components (compressor, condenser coil, evaporator coil, and blower fan) into a single unit located outside the building. These systems are typically used for smaller buildings or those without space for separate indoor and outdoor units. They can be gas-fired or electric-powered.

Here’s a table summarizing the key characteristics of each type:

Type of System Description Advantages Disadvantages
Split System Most common type, separate indoor and outdoor units Efficient, good for various climates (depending on type) Requires ductwork, installation can be complex
Hybrid Split System Combines electric AC with gas furnace Efficient in both heating and cooling seasons More complex than standard split systems
Ductless Mini-Split System No ductwork needed, good for renovations Flexible installation, efficient Higher upfront cost compared to some ducted systems
Packaged Heating and Air Conditioning All components in one outdoor unit Saves space, simpler installation Limited capacity, less efficient than some split systems


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What is the Common Problem in Split AC?

Several common problems can arise with split AC units, affecting their performance and comfort level. Here are some of the most frequent issues:

1. Lack of Cooling:

  • This is often the most reported issue and can be caused by several factors:
    • Dirty air filter: A clogged filter restricts airflow, reducing the AC’s ability to cool effectively.
    • Low refrigerant level: Leaking refrigerant decreases the system’s cooling capacity.
    • Faulty compressor: The compressor is the heart of the AC and its malfunctioning can significantly impact cooling.
    • Blocked condensate drain: A clogged drain prevents the removal of condensate water, leading to reduced cooling efficiency and potential water leaks.

2. Unusual Noises:

  • Split ACs shouldn’t generate excessive noise during operation. Unusual noises can indicate various problems:
    • Loose parts: Components within the unit might become loose and vibrate, causing noise.
    • Worn-out fan motor: A failing fan motor can produce grinding or rattling noises.
    • Refrigerant leaks: Leaking refrigerant can sometimes create hissing sounds.

3. Ice Buildup on Indoor Coil:

  • This can occur due to:
    • Low refrigerant level: Insufficient refrigerant can cause the evaporator coil to become too cold, leading to ice formation.
    • Dirty air filter: Restricted airflow can also contribute to ice buildup.
    • Defective thermostat: A malfunctioning thermostat might not regulate temperature properly, causing the coil to overcool and freeze.

4. Water Leaks:

  • Leaks can originate from various sources:
    • Clogged condensate drain: As mentioned earlier, a blocked drain can lead to water accumulation and leakage.
    • Loose connections: Leaky pipes or connections within the unit can cause water dripping.
    • Damaged drain pan: A cracked or damaged drain pan might not hold the condensate water properly, leading to leak.

5. Malfunctioning Thermostat:

  • A faulty thermostat can cause several problems:
    • Inconsistent temperature: The AC might not maintain the desired temperature settings.
    • Short cycling: The AC unit might frequently turn on and off, reducing efficiency and comfort.
    • Lack of response: The AC might not respond to adjustments on the thermostat.

It’s important to note that attempting to diagnose and repair complex AC issues yourself is not recommended. If you experience any of these problems, it’s crucial to consult a qualified HVAC professional for accurate diagnosis and safe repairs to ensure your AC functions optimally and avoid further complications.

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Do split AC need maintenance?

Yes, split AC units absolutely require regular maintenance to ensure optimal performance, efficiency, and lifespan. Here’s why:

Importance of Maintenance:

  • Improved Performance: Regular cleaning of filters and other components helps maintain efficient airflow and cooling capacity. A neglected AC unit can lose efficiency and struggle to maintain the desired temperature, leading to discomfort and higher energy consumption.
  • Extended Lifespan: Proper maintenance reduces wear and tear on the components, extending the lifespan of your AC unit and potentially saving you money in the long run.
  • Prevents Breakdowns: Regular inspections can help identify and address potential issues early on, preventing costly breakdowns and repairs.
  • Improved Air Quality: Cleaning filters and maintaining the unit helps prevent dust, allergens, and mold growth, contributing to better air quality in your home.


Maintaining Your Air Conditioner


Recommended Maintenance Routine:

  • Clean the air filters: This is crucial and should be done every 2-4 weeks depending on usage and dust levels. Wash or vacuum the filters and replace them when necessary.
  • Clean the outdoor unit: Twice a year, gently remove leaves, debris, and dirt from the outdoor unit’s condenser coil using a soft brush or garden hose. Be careful not to bend the fins.
  • Schedule professional service: Every 2-3 years, schedule a professional technician to inspect the entire unit, clean internal components, and perform routine maintenance tasks.

Additional Tips:

  • Consult the owner’s manual: Refer to your AC unit’s manual for specific cleaning instructions and maintenance recommendations.
  • Replace worn-out parts: If any parts like belts or filters become worn out, replace them promptly to maintain optimal performance.
  • Monitor performance: Be mindful of any changes in performance, such as decreased cooling efficiency, unusual noises, or leaks. Address any issues promptly to avoid further problems.


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Can Split AC run 24 hours?

Yes, a well-maintained split AC can technically run 24 hours a day. They are designed to operate continuously and have built-in mechanisms to regulate cycles and prevent overheating. However, running it constantly might not be the best practice for several reasons:

1. Increased energy consumption: While split ACs are generally more efficient than window ACs, running them continuously will still consume a significant amount of energy, resulting in higher electricity bills.

2. Increased wear and tear: Constant operation puts more strain on the AC unit’s components, leading to faster wear and tear and potentially shortening its lifespan. Regular on/off cycles allow the unit to rest and cool down, extending its longevity.

3. Reduced efficiency: Over time, running the AC continuously can reduce its efficiency. Dust and dirt buildup can become more significant, impacting performance and requiring more energy to maintain the desired temperature.

4. Potential for discomfort: Continuously running the AC can over-cool your space, leading to dryness and discomfort, especially in colder months. Maintaining a reasonable temperature setting and allowing the unit to cycle on and off can help maintain a comfortable environment.

Therefore, while a split AC can run 24 hours, it’s generally not recommended for continuous operation. Here are some alternatives for maintaining comfort without constant AC use:

  • Set a timer or use an auto mode: Set the AC to turn on and off automatically at desired times to maintain a comfortable temperature while you’re asleep or not at home.
  • Adjust the thermostat: Experiment with slightly higher thermostat settings to find a balance between comfort and energy efficiency.
  • Utilize ceiling fans: Ceiling fans can help circulate cool air more effectively, allowing you to raise the thermostat setting slightly.
  • Invest in regular maintenance: Schedule regular cleaning and professional maintenance to ensure your AC operates efficiently and minimizes the wear and tear from occasional longer running times.
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What is the Life of Split AC?

The average lifespan of a split AC unit can vary depending on several factors, but typically they last anywhere from 10 to 15 years with proper care and maintenance. Here are some key factors that can affect the lifespan of your split AC:

  • Brand quality: Reputable brands often use higher-quality materials and components, leading to a longer lifespan compared to budget brands.
  • Maintenance: Regularly cleaning filters, scheduling professional inspections, and addressing any issues promptly can significantly extend the life of your AC.
  • Usage patterns: Frequent use, especially in extreme temperatures, can put additional strain on the unit and potentially shorten its lifespan.
  • Climate: Harsh conditions like extreme heat, humidity, or dust can wear down the components faster than moderate climates.
  • Installation: Proper installation by a qualified professional ensures the AC functions efficiently and avoids potential issues that could shorten its lifespan.



Here are some additional points to consider:

  • Inverter technology: Inverter ACs can potentially last longer than non-inverter ACs due to their smoother operation and reduced wear and tear on the compressor.
  • Advancements in technology: Newer AC models may incorporate features and materials that contribute to improved durability and lifespan.


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Which AC is Best For Daily Use?

Choosing the “best” AC for daily use in Surat, Gujarat, India, depends on several factors, including:

Room size:

  • Small room (up to 150 sq. ft.): A window AC might be sufficient, especially if budget is a major concern.
  • Larger room (above 150 sq. ft.): A split AC is generally recommended for efficient cooling and better comfort.


  • Window ACs are generally cheaper upfront than split ACs.
  • Split ACs can be more cost-effective in the long run due to their energy efficiency, but they also involve installation costs.


Other factors:

  • Noise level: If noise is a concern, inverter split ACs are significantly quieter than window ACs and non-inverter split ACs.
  • Energy efficiency: For long-term savings and environmental consciousness, inverter split ACs are the most energy-efficient option.
  • Desired features: Consider features like remote control, sleep mode, and air filtration based on your preferences.

Considering these factors, here are some recommendations for daily use in Surat:

For small rooms and budget constraints:

  • window AC might be a suitable option, but keep in mind its limitations like noise and lower efficiency.

For larger rooms and a focus on long-term value:

  • An inverter split AC is likely the best choice. It offers efficient cooling, quieter operation, and potential cost savings over time. You can explore single split ACs for a single room or multi-split ACs if you need to cool multiple rooms.

Additional tips for daily use:

  • Regular maintenance: Schedule regular cleaning and maintenance of your AC unit to ensure optimal performance and lifespan.
  • Set the right temperature: Don’t overcool your space. Setting your thermostat 2-3 degrees higher can significantly reduce energy consumption.
  • Use ceiling fans: Ceiling fans can help circulate cool air more effectively, allowing you to raise the thermostat setting slightly for additional savings.
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Can a Split AC be used for 2 rooms?


A standard single split AC unit is typically designed to cool just one room effectively. However, there are two ways you can use a split AC system to cool multiple rooms:

1. Multi-Split AC System:

  • This type of system consists of one outdoor unit connected to multiple indoor units. Each indoor unit can be independently controlled, allowing you to set different temperatures for different rooms.
  • Multi-split ACs are a more expensive option than single split units, but they offer the advantage of true zone control and can efficiently cool multiple rooms (typically up to 5).

2. Cooling Adjacent Rooms with a Single Split AC (Not Recommended):

  • In certain situations, you might be able to use a single split AC unit to partially cool two adjacent roomsespecially if they are small and have an open layout.
  • However, this is not recommended as the effectiveness will be limited due to several factors:
    • Uneven cooling: The room where the indoor unit is located will be significantly cooler than the adjacent room.
    • Reduced efficiency: The AC unit might struggle to maintain the desired temperature in both rooms, leading to increased energy consumption.
    • Strain on the unit: Overworking the AC unit to cool two rooms can put additional stress on its components and potentially shorten its lifespan.

Therefore, for effectively cooling multiple rooms, a multi-split AC system is the recommended solution. If you only need to cool partially cool two small, adjacent rooms, using a single split AC might be a temporary option, but it’s important to be aware of the limitations and potential drawbacks.

It’s crucial to remember that improper cooling solutions can lead to increased energy costs, discomfort, and potential damage to your AC unit. Consulting with a qualified HVAC professional is always recommended to discuss the best options for your specific needs and ensure proper installation and operation.

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Difference Between Inverter AC and Non Inverter AC?

The key difference between Inverter ACs and Non-Inverter ACs lies in their compressor technology:

1. Compressor Technology:

  • Inverter AC: Utilizes a variable-speed compressor. This allows the compressor to adjust its speed to gradually reach and maintain the desired temperature. It’s like using the gas pedal in a car to control speed instead of constantly stopping and starting.
  • Non-Inverter AC: Employs a fixed-speed compressor. It operates at full power until the desired temperature is achieved, then completely shuts off. This process repeats, leading to temperature fluctuations and higher energy consumption.

2. Key Differences:

Here’s a table summarizing the key differences:

Feature Inverter AC Non-Inverter AC
Compressor Speed Variable Fixed
Temperature Control More precise, less fluctuation Less precise, more fluctuation
Energy Efficiency More efficient,saves up to 30% energy Less efficient, higher energy consumption
Noise Level Quieter operation Can be noisy, especially during start-up and shut-down cycles
Durability May have a longer lifespan due to reduced wear and tear May have a shorter lifespan due to frequent on/off cycles
Cost Higher initial cost Lower initial cost

3. Additional Considerations:

  • Comfort: Inverter ACs offer a more comfortable experience due to their ability to maintain a consistent temperature.
  • Environment: Inverter ACs are generally considered more environmentally friendly due to their lower energy consumption.
  • Payback Period: While the initial cost of an inverter AC is higher, the energy savings over time can offset the difference in a few years.


Inverter ACs offer significant advantages in terms of energy efficiency, noise level, comfort, and potentially, long-term value. However, they come with a higher initial cost. Non-Inverter ACs are a more affordable option but may not be as efficient or comfortable in the long run. Ultimately, the best choice depends on your budget, priorities, and usage patterns.

Inverter vs Non Inverter AC


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what is Split ac ?

A split air conditioner, also known as a split AC, is an air conditioning system that consists of two main units: an outdoor unit and an indoor unit.

  • Outdoor unit: The outdoor unit, also called the condenser unit, houses the compressor, condenser coil, and expansion valve. It is typically located outside the home, on a patio or deck. The outdoor unit is responsible for removing heat from the refrigerant and releasing it into the outside air.
    Image of Split AC outdoor unit
  • Indoor unit: The indoor unit, also called the evaporator unit, houses the evaporator coil, blower fan, and air filter. It is typically located inside the home, on a wall. The indoor unit is responsible for circulating cool air throughout the room.
    Image of Split AC indoor unit

Split ACs are a popular choice for homes and businesses because they are more efficient than window ACs. They are also quieter, as the noisy compressor is located outside the home. Additionally, split ACs can be more flexible than window ACs, as they can be installed in a variety of locations.

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