Cooling Solutions

Cooling Solutions

Everything you need to know about Air Conditioners:

1. How much power do you need?

When buying air conditioners, your first consideration is likely to be how powerful the device needs to be to adequately cool your home. Air conditioner capacity is rated by BTU (British Thermal Unit) and power output in kilowatts. Buying the right size unit is very important as air conditioners that are too big will use more energy, while under-sized ones will not cool the room sufficiently. As a rough guide, 80 watts of power per square metre should be enough for bedrooms, while living rooms may require around 125 watts per square metre. So for a living room measuring 30 square metres a unit of approximately 3.75kW will be needed.

2. Types of Air Conditioners

Split System

These air conditioners are made up of two parts, with one attached to the internal wall of your home, while the other sits on the outside to exhaust heat out. These are low cost to install and with separate units for each room they provide flexibility.

Reverse System

A reverse system refers to air conditioners that provide a cooling and heating function. The obvious benefit is that they are also useful during the winter months.

 

Inverter System

Air conditioners with inverters are able to vary the temperature of the air they produce, rather than stopping and starting. They are often quieter, cheaper to run and achieve the desired room temperature more quickly – although they are more expensive.

Multi System

Multi-split air conditioners connect multiple indoor units to a single outdoor condenser. They require less ductwork, but a single control station operates the whole system, meaning individual room temperatures are not possible. For more information on how to choose air conditioning for your home.

3. What sort of extra features do you need?

Air conditioners with more features tend to be more expensive, but here is a list of common extras that are available:

  • Remote control
  • Timer
  • Sleep timer
  • Dehumidifier
  • Reverse cycle for heating
  • Slide-out chassis for easier installation
  • Mosquito traps
  • Air filter to remove odours, smoke and germs

4. Energy Efficiency

Air conditioners are rated on their energy efficiency using a ten-star scale, with more stars meaning the unit is better for the environment. For units with cooling and heating functions, separate ratings are given for each. Inverter air conditioners are more energy efficient due to their ability to regulate temperature without starting or stopping.

5. Choose a professional installer

Installing an air conditioner is very technical and involves many processes. In Malta, you will need to hire a licensed professional to install and service your new air conditioning system. These air conditioner installation experts have had relevant training and are licensed to handle refrigerants. Air conditioners often include manufacturer’s warranties, so to ensure you’re covered under the warranty if something goes wrong, professional installation is a mandatory.

What else should I look for when buying a room air conditioner?

1. Determine the room's square footage

Determining the floor square footage of the area to be cooled takes simple math.  Just use the following formulas.

9 in = .75 ft.

6 in = .5 ft.

3 in = .25 ft.

Always measure in feet, converting the inches to fractions of a foot

For example: 12 ft., 6 inches, is 12.5 ft.

Square and rectangular rooms:

Multiply the full length of the room by its width.
Square Room
Rectangle Room

Triangular rooms:

Multiply the length of the area by the width and divide by two.
Triangle Room
Triangle Room

Complex room shapes:

Sub-divide into squares, rectangles and triangles.  Then use the formulas above to determine the total square footage.
Complex Room
Complex Room

If the shape of your room is more complex, ask your sales associate where you plan to purchase your air conditioner to help you determine the square footage.

2. Find the correct cooling capacity for your room size

With the cooling capcity chart, find your room's square footage in the "Area To be Cooled (square feet)" column, then use the "Capcity Needed (BTUs per hour)" column to choose the correct cooling capacity for your room air conditioner. Cooling capacity is shown in British thermal units (BTUs) per hour.

Area To Be Cooled (square feet)Capacity Needed (BTUs per hour)
100 up to 150 5,000
150 up to 250 6,000
250 up to 300 7,000
300 up to 350 8,000
350 up to 400 9,000
400 up to 450 10,000
450 up to 550 12,000
550 up to 700 14,000
700 up to 1,000 18,000
1,000 up to 1,200 21,000
1,200 up to 1,400 23,000
1,400 up to 1,500 24,000
1,500 up to 2,000 30,000
2,000 up to 2,500 34,00