Bobby Brown
Post 2023-12-15
Choose the Right Air Conditioner: A Buyer's Guide


  • Types of Air Conditioners: Window units for temporary solutions; Split ACs offer quieter, efficient long-term performance
  • Calculating AC Capacity: Essential for efficiency; Factors include room size, ceiling height, occupants, sun exposure, and kitchen presence
  • Inverter vs. Non-Inverter AC: Inverter ACs are energy-efficient, quieter, with better temperature control, but costlier; Non-inverter ACs are less efficient but cheaper
  • Electricity Consumption of AC: Depends on wattage, usage hours, and tariff; Calculate using AC's power rating and operational time
  • AC Size and Efficiency: Choosing the right size and type (inverter/non-inverter) impacts comfort, energy efficiency, and long-term costs


What is Air Conditioning?

Air conditioning (AC), often perceived as synonymous with air cooling, actually encompasses a broader concept. While air coolers focus primarily on reducing temperature, AC systems manage both temperature and humidity within indoor spaces. Air conditioning includes refrigeration, dehumidifying, and even heating capabilities. In contrast, an air cooler typically lacks these multifunctional attributes. The more comprehensive HVAC (Heating, Ventilation, Air-conditioning, and Cooling) systems extend this functionality further by integrating heating, ventilation, humidity control, air purification, and circulation into one unified system. Therefore, while air cooling is a part of air conditioning, the latter offers a wider range of environmental control for indoor spaces


How to Choose an Air Conditioner: What are the Types?

Types of Air Conditioner

Types of Air Conditioner

When selecting an air conditioner, you're primarily looking at window air conditioners and split air conditioners. There's no absolute better choice; it all depends on your needs.

Window air conditioners are integrated units with all components (compressor, condenser, evaporator, and cooling fan) housed in a single machine. They are ideal for rental homes or temporary cooling needs due to their easy installation and removal. Generally more affordable than split systems, their downside is often the operational noise.

Split air conditioners consist of indoor units (with evaporators and fans) and outdoor units (housing compressors and condensers), requiring more complex installation with drilling and piping. They offer more efficient temperature control. Initially, the purchase and installation costs are higher than window units, but they may be more cost-effective in the long run due to lower operational costs.

Window units are suited for small spaces and temporary solutions, characterized by easy installation and lower costs. Split systems, on the other hand, cater to more permanent and extensive cooling needs, offering quieter operation and efficient long-term performance

Calculate the Right Air Conditioner (AC) Capacity for Your Space

Calculating the right air conditioner (AC) capacity for your space is essential for efficient cooling and energy usage. Here's a concise guide:

Area Calculation: Determine the room size in square feet. Multiply the room’s length by its width.

AC Capacity: Air conditioners are rated in British Thermal Units (BTUs) per hour. The general rule is 20 BTU per square foot of living space. For example, a room of 300 square feet would require an AC with a 6,000 BTU capacity.

Adjustments for Room Conditions: Modify the base capacity depending on various factors:

Ceiling Height: If your ceiling is higher than 8 feet, increase the BTU/hr by 1,000 for each additional foot.
Number of Occupants: Add 600 BTU/hr for each person if more than two regularly occupy the room.
Room Exposure to Sun: Increase capacity by 10% for sunny rooms or reduce by 10% for heavily shaded rooms.
Kitchen Presence: Add 4,000 BTU/hr if the AC unit is used in a kitchen.

Other Considerations: Factors like the type of construction material, presence of large windows, and the floor level of the room can also impact the required AC capacity.

For specific calculations, it's recommended to consult a professional or use an online calculator, such as the one provided by OmniCalculator. This will ensure that you get the most accurate estimate for your needs. Remember, choosing the right AC size is not just about comfort but also about energy efficiency and prolonging the life of your unit.

Inverter vs. Non-Inverter Air Conditioner: Which One Should I Choose?

Inverter air conditioners (ACs) are gaining popularity for their energy efficiency compared to non-inverter ACs. Here's a brief comparison to help you understand the differences and decide if switching to an inverter AC is right for you:

Energy Efficiency and Cost: Inverter ACs are more energy-efficient, adjusting the compressor's speed to match cooling requirements, which reduces power consumption. Though costlier upfront, they save on electricity bills in the long run. Non-inverter ACs, while cheaper initially, tend to have higher operating costs due to their constant on-and-off cycling.

Noise Level: Inverter ACs operate more quietly, as their compressors don't frequently turn on and off. This contrasts with non-inverter ACs, which can be noisier due to their regular starting and stopping.

Cooling Speed and Experience: Inverter ACs provide faster, more efficient cooling and maintain a stable room temperature, enhancing comfort. Non-inverter ACs, however, may experience temperature fluctuations, as they stop cooling once the set temperature is reached and restart when the temperature varies.

Maintenance and Durability: Generally, inverter ACs are lower maintenance and have a longer lifespan due to less wear and tear on the compressor. Non-inverter ACs, while often requiring less complex maintenance, may not last as long due to their constant on-off cycling.

Environmentally Friendly: Inverter ACs often use eco-friendly refrigerants and contribute to reduced environmental impact due to lower energy consumption.

In conclusion, while inverter ACs have a higher initial cost, their long-term savings, efficient operation, and environmental benefits make them a compelling choice, especially for those who use ACs extensively. On the other hand, if you're on a tight budget and require AC for shorter periods, a non-inverter AC might be more suitable.


Calculate the Electricity Consumption of AC

Calculating the electricity consumption of an air conditioner (AC) can be straightforward when you know the right formula and have the necessary information. Generally, the power consumption depends on the AC's wattage, operational hours, and the electricity tariff in your area. Here's a brief guide on how to calculate it:

Identify the Power Consumption of Your AC: The power consumption of an AC is usually given in watts (W) or kilowatts (kW). For example, a 1-ton AC might consume around 1.2 kW, while a 1.5-ton AC could use about 1.8 kW.

Calculate Hourly Consumption: To find out how much electricity your AC consumes per hour, simply use its power consumption rating. For instance, a 1-ton AC (1.2 kW) running for an hour would consume 1.2 kWh of electricity.

Estimate Daily and Monthly Usage: Multiply the hourly consumption by the number of hours you use the AC daily to get daily consumption. For monthly consumption, multiply the daily usage by the number of days in a month. For example, running a 1.5-ton AC (1.8 kW) for 5 hours a day would result in 9 kWh daily and approximately 270 kWh monthly (considering 30 days in a month).

Calculate Electricity Cost: To find out how much it costs to run your AC, multiply the total kWh consumed by your electricity rate per kWh. For example, if the electricity rate is $0.10/kWh, running a 2-ton AC for 3 hours daily would cost around $1.44 per day.

Remember, these calculations can vary based on the specific model of your AC, its energy efficiency rating (like SEER or EER), and your local electricity rates. Modern ACs, especially those with inverter technology, tend to be more energy-efficient than older models.

For precise calculations tailored to your AC model and usage pattern, you can use online calculators provided by various websites. These calculators often require you to input details like AC tonnage, SEER rating, hours of operation, and local electricity tariff to give you an accurate estimate of power consumption and cost.

For more details, please refer to these websites: Air Conditioner Power Consumption Calculator


Applications of Flow Meters and Nozzles in Air Conditioning Systems

In HVAC systems, controlling the flow of cooling or hot water is crucial to maintaining proper operating temperatures and pressures. If liquid flow is too high or too low, the system can become unbalanced, leading to reduced pressure or decreased efficiency. Therefore, liquid flow meters are used to monitor and control liquid flow, ensuring the system operates smoothly. Additionally, in HVAC systems, liquid flow meters can also be used to measure water usage, essential for water efficiency and conservation. They can monitor water consumption, prevent water wastage, and detect leaks.

Applications 1: Government Smart Energy-Efficient Community Water Monitoring

Smart energy-efficient communities monitor chiller energy and water usage with flow meters

Case: Taichung City Smart Energy-Efficient Community Subsidy Project

Situation: Taiwan Taichung City Government conducted the "Taichung City Government Smart Energy-Efficient Community Benchmarking Subsidy Project" in 2020, awarded to AU Optronics. For household water resource management, flow meters are used to monitor the energy and water usage of ice machines, enabling energy efficiency reporting and establishing a comprehensive energy management system.

Solution: FP-AS510 Patent AxleSense Paddlewheel Flow Meter
In this project, AxleSense turbine flow meters are installed behind water meters to record cumulative and instantaneous flow rates and communicate real-time data via RS485. Furthermore, the project utilizes AxleSense turbine flow meters' real-time flow velocity information to categorize various household water usages such as toilets, showers, and kitchen sinks. These flow meters seamlessly integrate with household smart energy-efficient devices, allowing precise monitoring of water consumption, leak detection, and wastewater discharge, serving as parameters for the entire energy-saving system to achieve intelligent water conservation goals.

Application 2: Smart Building Water Usage Monitoring

Santander's new corporate building in Chile

Case: Banco Santander Chile's Smart Building

Situation: Smart buildings are a global architectural trend, with Chile being at the forefront. New government buildings and local hospitals in Chile require the installation of liquid flow meters to monitor water consumption. Traditional water meters or electromagnetic flow meters were commonly used in the past. However, traditional water meters lack signal transmission capabilities and have accuracy limitations, while electromagnetic flow meters, although meeting these requirements, tend to be relatively expensive.

Solution: FP-AS510 Patent AxleSense Paddlewheel Flow Meter
Understanding the demand for flow meters in Chile, we confidently recommend the FP-AS510 AxleSense Turbine Flow Meter as the ideal alternative. The AxleSense Turbine Flow Meter features built-in communication outputs: 4-20mA analog output, Modbus RTU RS485 control signal, and optocoupler switch signal (Pulse signal), catering to various signal requirements. Its rapid update function enhances flow data frequency, enabling more precise flow monitoring at the central control console.

Application 3: Monitoring Energy Efficiency in Chilled Water Systems

Installation of Liquid Flow Meters in Chiller Systems for Monitoring Energy Efficiency

Case: Situation at a Taiwan-German Joint Venture Non-Woven Fabric Manufacturer

Situation: In line with the United Nations Sustainable Development Goals, Taiwan mandates energy users to report energy efficiency for their equipment. To comply with government regulations, the Taiwan-German joint venture non-woven fabric manufacturer needed to install liquid flow meters in their factory's chilled water systems. However, their existing chilled water systems lacked integrated flow monitoring capabilities, and the company sought a solution that could be installed without shutting down the systems.

Solution: LORRIC FU-TX310 Clamp-On Ultrasonic Flow Meter
During discussions with the client, it became apparent that the installation process for ultrasonic flow meters presented a significant challenge. The ideal measurement pipe size for the client's chilled water systems was 12 inches, and improper probe placement could affect data accuracy during installation. To address the installation difficulties of ultrasonic flow meters, LORRIC patented a metal fixture for the probes, allowing clients to easily identify the correct probe installation position, streamlining the installation process.


  1. ^ about your common HVAC issues - AC HEATING CONNECT
  2. ^ What is air conditioning? The home AC System explained - BOXT
  3. ^ Air Conditioning Size Calculator-Comfy Home
  4. ^ Air conditioners - Explainthatstuff
  5. ^ What Size Air Conditioner Do I Need? (2024 Guide) - This Old House
  6. ^ How Much Air Conditioner Capacity Do You Need For Your Home - Mclaircon
  7. ^ Air Conditioner BTU Calculator - OMNI Calculator (Kenneth Alambra)
  8. ^ What is the Difference Between Inverter and Non-Inverter AC? - TCL
  10. ^ Inverter AC Vs Non-Inverter AC, Which One is Right For You? - HOMEZENE
  11. ^ Inverter vs. Non-Inverter Air Conditioner Unit: Pros & Cons - LUCE
  12. ^ Air Conditioner Power Consumption Calculator [1, 1.5, 2 Ton AC Energy Bill Estimator - Electrical Calculators Org
  13. ^ How Much Electricity (kWh) Do Air Conditioners Use? (Calc + Chart) - LEARN METRICS HVAC
  14. ^ Calculate the power consumption of AC & Electricity usage - ELECTRICAL CLASSROOM
  15. ^ How Much Electricity Does an Air Conditioner Use? - PICKHVAC
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