
Aircon Hp Per Sqm Calculator: What AC Size Do I Need?
Aircon Hp Per Sqm Calculator: What AC Size Do I Need?
Choosing the right air conditioner unit is not just about the sqm measurements – that is just the baseline. You need to consider the ceiling height, room insulation, appliances in the room, and number of regular occupants.
The Aircon HP per square meter calculator below can guide you to the perfect AC unit choice. Still, it helps to understand how certain factors affect indoor temperature.
A unit with lower HP than what is needed will work excessively to cool larger spaces, wasting energy and straining the engine. Conversely, an air conditioner that is excessively higher than the needed HP will consume more energy, remove less humidity, and break down more quickly than an AC unit that is the proper size.
Room size impacts the type of air conditioner needed, yes, but windows and sunlight also play a role, as well as a few more factors. Use these details with our calculator for an accurate selection.

How to Choose the Right Air Conditioner
1. Room size (floor area and ceiling height)
2. Number of Regular Room Occupants
3. Appliances in the Room
4. Sunlight Exposure
5. Insulation of the Room
How to Increase Your AC Cooling Capacity Efficiency
1. Cleaning and Maintenance
2. Cover Windows with UV Films/Curtains
3. Roof and Wall Insulation
Key Takeaways
- The Aircon HP per Sqm Calculator helps pick the right air conditioner by looking at room size, appliances in it, people count, and sunlight.
- Keeping AC units clean and using curtains or UV films can make them cool better.
- Insulating under the roof helps keep rooms cooler and cuts down on AC work.
- Before buying an aircon unit, it’s smart to talk to experts for a proper room check.
- Even though the calculator is useful, seeking AC professionals can help you decide on the right AC unit.
What is an Aircon HP Per Sqm Calculator?
An Aircon HP Per Sqm Calculator helps you find the right air conditioning unit based on your room’s size. You enter the dimensions in meters. The calculator works for different spaces such as homes, offices, and theaters.
It uses the information you provide to recommend the necessary horsepower (HP) for your air conditioner.
This tool matches your room size and its use with the needed cooling capacity. This ensures energy efficiency and meets cooling requirements. Next, we guide you on selecting the ideal air conditioner based on these insights.

How to Choose the Right Air Conditioner
In selecting the appropriate air conditioner, a number of factors should be considered including: Room size (the floor area and ceiling height), number of regular room occupants, appliances in the room; sunlight exposure, and insulation.
When you are looking at different units, also consider the energy efficiency ratio (EER) and seasonal energy efficiency ratio (SEER) measurements.
Room Size
The room size is the first basis for selecting the AC capacity.
Floor Area
Calculating the dimensions of the room helps you choose an air conditioning unit accordingly. This approach avoids energy waste with a too-large unit or insufficient cooling with a small one.
According to Meralco, this is the recommended HP for the corresponding room size:
Room Size | Aircon Horsepower (HP) |
6 to 11 sq. m | 0.5 HP |
12 to 17 sq. m | 0.75 HP |
18 to 22 sq. m | 1.0 HP |
23 to 27 sq. m | 1.5 HP |
28 to 40 sq. m | 2.0 HP |
41 to 54 sq. m | 2.5 HP |
Please remember that room size is just the baseline with a standard ceiling height of 8 feet. Other factors include: whether the room is on a sunny side or has big windows, the number of regular occupants, and the type and number of appliances.
Next up, the height of the ceiling.
Ceiling Height

Ceiling height affects air conditioner size. Add 20% BTU for each foot above 8 feet. You need to select the right unit for your room size and ceiling height or risk using too much power within and failing to get humidity out.
Proper sizing ensures efficiency.
Oversized units lead to increased energy usage. They also remove humidity poorly. Consulting accredited installers provides accurate cooling needs assessment based on ceiling height.
Number of Regular Occupants
The number of people in a room gives cooling loads. Typically, the range is from 1 to 6 people in a space. This affects heat generation and the capability of an air conditioner system to keep comfortable temperatures.
More people translates as more body heat, causing the temperature in the room to rise and increasing the demand on the air conditioning system. Typically, the count is 2 per room, any additional person means 600 BTU per person.
Counting every individual in an enclosed area has a lot to do with keeping a comfortable room temperature. Accurately assessing this factor is crucial when determining suitable aircon installation for optimal energy efficiency and indoor comfort levels, especially during peak occupancy periods.
Appliances in the Room

Look at the appliances/devices that emit heat in the room where you will install your air conditioner – PC or laptop, TV, refrigerator, stove, or microwave. New devices add total heat in the space, resulting in a higher stagnation heat load to the AC, which decreases the efficiency of the AC unit.
Therefore, it is necessary to take them into consideration while using the air conditioning calculation formula, as well as choose the appropriate type of air conditioning for your room size.
Every appliance like TV sound system, or PC adds additional 500 BTU per appliance. For major kitchen appliances like a stove or refrigerator, the requirements are higher and is factored into our calculator below.
Sunlight Exposure
The amount of sunlight received is an important metric in determining the cooling needs of a space. Sunlight can raise the temperature on the inside, and the air conditioning system has to work harder.
That being said, it helps to know that your house/room orientation also affects load on AC. East-facing rooms get less intense sunlight, while west-facing house or room gets warmer, more intense sunlight.
Consider using curtains or UV window films to reduce the impact of direct sunlight on room temperature.
Shaded Room
Shades on windows allow less direct sunlight into the room, which is a major cause of heat gain. This subsequently reduces the burden on the air conditioning unit which can save energy and improve cooling quality.
This effect is magnified by the need for adequate insulation which helps maintain a stable in-house temperature, thus reducing the amount of work your AC unit does. Not only do shaded rooms promote a more comfortable environment, they also aid energy consumption and cost-efficiency.
With these aspects taken into account and integrating shaded window and insulation characteristics into an air conditioning capacity calculator, one could able to get more accurate room-wise cooling capacity calculation.
Considering all of these factors helps people make informed decisions about the best air conditioning unit for a room and so optimize energy use and the comfort level of their home or work place.

Sunny Room
The requirement for cooling can heavily rely on how much sunlight the room gets. Rooms exposed to the sun absorb light and heat, leaving rooms warmer, which means the AC has a lot of work to do to cool things down.
Direct sunlight increases the cooling load by 10%. Rooms with direct sunlight may require a higher capacity air conditioner.
When calculating the air conditioning unit’s horsepower per square meter, check if the room is in the sun all day or only at certain hours. This will help determine the requisite horsepower for adequate cooling, particularly depending on how much direct sunlight the room receives.
Insulation of the Room
Insulation is an important factor in deciding aircon size for your room. It influences how much heat gets in or out of the room. Good insulation will make it easier for your aircon to cool the room, lowering your energy bill.
Proper room insulation helps in maintaining a consistent temperature and ease out strain on your AC. Without it, you might require a bigger, more powerful setup to deal with the temperature swings due to inadequate insulation.
Insulation includes details like whether you have more or bigger windows,
This drives up both initial installation costs and long-term energy bills.
A well-insulated home will not require such a big AC unit to cool it down efficiently, which will save you money in the long run. Being aware of how important room insulation is can help you decide on the right on the right sized air conditioner for you space.
How to Increase Your AC Cooling Capacity and Efficiency
To boost your AC’s cooling effectiveness, keep the unit clean and well-maintained regularly, use curtains or UV window films to limit heat entry, and insulate the ceiling and walls to better control temperatures.
Learn everything you need to know about air conditioning system optimization.
Regular Cleaning and Maintenance Check
Ongoing upkeep enhances efficiency and makes it last. The following tasks need to be carried out:
- Check and clean or replace air filters every 1-3 months.
- Check and straighten coil fins.
- Clear debris around the outdoor unit.
- Remove dirt from evaporator and condenser coils.
- Straighten coil fins using a fin comb if necessary.
- Line the perimeter around the outdoor unit to be clear of debris.
- Get it inspected and serviced by professionals at least once a year (or more, depending on use and location) to keep the car in good condition.
This type of regular maintenance keeps your AC system performing at its best, avoiding more significant issues down the road.
Check the AC maintenance and repair specialists in your area.

Cover Windows with UV Window Films or Curtains
Also, having better insulation under the roof or walls is very important. It keeps indoors cooler and helps lighten your AC unit’s load. Using UV window films or curtains are also another effective step to block out sunlight and keep excess heat from entering your house.
Doing so will greatly increase your unit’s efficiency, lowering your energy usage and making your home feel even better.
A UV window film can block up to 99% of UV rays and 80% of solar heat generated by its infrared rays. Such a simple adjustment can help keep your home a bit more comfortable without placing too much stress on your air conditioning system, which helps promote energy efficiency and savings in the long run.
Check out the window film installation specialists.
Curtains help block the sun’s heat, too, though not as much as UV window films.

Have Roof and Wall Insulation
Insulation helps retain cool air inside, reducing the workload of your air conditioners. Good insulation means it takes less energy to keep a room cool. This is affordable and good for a better living – which is the reason why 25 – 30% of cooled air is lost through poorly insulated roofs. For those with concrete roofs, or those in condominiums, this means lesser strain on your AC.
Installing insulated roofing sheets or sheets with reflective coatings help reduce indoor temperature. Applying heat reflective roof paints will also help. Alternatively, insulation foam will also help keep indoor temperatures consistent, which will lead to less strain on your AC unit.
Any of these roof insulation methods prolongs its life span and shrinks the maintenance cost. Even outdoor noise cannot get into your space with good insulation; thus enhancing your comfort.
Check the roofing specialists here if you want to add roof insulation.
For walls, there are insulated wall panels or even spray foam insulation to further reduce heat.
Also, sealing any gaps or leaks in the roof prevents hot outdoor air from seeping into the interior space.
Now you can apply these in combination to make your HVAC system as efficient as possible while promoting optimal indoor comfort and sustainability for years to come.

The Aircon HP Calculator
Since in the Philippines we are more used to measuring rooms by square meters, input your room size in sqm. We need to convert this to sq ft because the unit to calculate the AC needed is in British Thermal Unit/Hr per sq ft.
Please note that this is just an estimate and it is best to consult an aircon installation professional in our directory.
Want to save on your electricity bill while enjoying your AC? Visit our post on solar panels to see if it is a worthy investment.
The Aircon HP Calculator helps to easily find out the correct air conditioner size required. It assesses the cooling capacity needed for a room based on factors like room size, occupant load, sun exposure, and shaded windows.
Be entering these variables, the tool will output the recommended cooling capacity in horsepower (HP). Please remember to have an area survey performed by certified professionals before buying an air conditioner.
This calculator is intended to help users make choices about ducted or split system air-conditioning. It aids in determining the energy-efficient options of cooling tailored to each scenario according to heat load as well as room specification.
It is designed to be intuitive while providing essential information for efficient aircon installation and improved management of energy consumption within indoor spaces.
Conclusion
The Aircon Hp Per Sqm Calculator is a useful tool for choosing the right air conditioner. This calculator considers room size, sunlight exposure, and other factors to select an ideal unit.
It uses scientific principles to ensure that homes stay comfortable. using this calculator before installing an aircon unit helps save money and energy while maintaining cool indoor temperatures and prolonging the life of your ac unit.
However, while the calculator is helpful, it is best to consult AC installation professionals.
Check AC installation specialists in your area here.
FAQs
1. What is an aircon hp per sqm calculator?
Using an aircon hp per sqm calculator helps you determine what size room you need based on its dimensions. Based on factors such as energy efficiency and the square footage of the room that needs cooling, it suggests the correct air conditioning unit. With the correct airconditioning unit plus regular maintenance, it prolongs your AC unit’s life.
2. What does this calculator do for the performance of my air conditioning system?
It can guide you to choose the right air conditioning units with required horsepower (hp) by calculating the specific cooling needs of your room. Seek professional advice of airconditioning specialists to ensure energy efficiency and indoor air quality
3. Is this tool for any type of room or just specific sizes?
Use this tool for any room size! Whether you will create new ductwork or have placed room air conditioners, the number of watts based on British Thermal Units (BTU) required will give you maximum cooling efficiency.
4. Does using an appropriate sized AC unit have any other benefits aside from proper cooling?
Absolutely! In maintaining comfortable temperatures, selecting the proper size AC unit also allows for a better overall indoor air quality, important for fitness and well-being.
5. Does the horsepower of my AC unit affect my electric bill?
Yes, these two things are very much linked. An excessively high or low hp AC might use far more energy than necessary, thus costing you more. Hence using an Aircon Hp Per Sqm Calculator aids in selecting a suitably powered unit reducing unnecessary expenses.