About Mbombela Airconditioning Nelspruit

Hi Wall Air Conditioner

To begin with we offer the flexibility to choose which room to heat or cool at any given time.

A Split System air conditioner allows you to section off the areas of the house where you would like the cooling or heating to run.

Therefore constantly saving on electricity by heating and cooling only the rooms that you are using. 

The outdoor section/ compressor can be mounted on a flat roof, on the ground or on a wall bracket outside.

Which minimises the noise inside your home/office.

Air Conditioning

Inverter Cassette Units

Intelligent inverter technology works the same way as wall mounted split systems.

But drawing air in and out at roof level instead.

Being designed so they are installed flush with the roof level.

Gives a clean outlook and also ensure precise power control.

While flexible installation with a space-saving outdoor unit making this range an easy way to heat and cool your home.

Air Conditioning

Ducted Split Units

An inverter reverse cycle Ducted Air Conditioner is designed to enable each room in your home to be cooled or heated by one system.

Ducted Systems are also relatively unobtrusive as the conditioned air is distributed through ducts hidden in your roof space to outlets in the ceiling of each room.

The primary components of your Ducted System consist of the indoor unit, outdoor unit and controller.

Air Conditioning

What size Air Conditioning Unit do you need?

For a room of approximately: Air conditioner size required:
10 to 15 m² 9 000 BTU
16 to 20 m² 12 000 BTU
21 to 30 m² 18 000 BTU
31 to 40 m² 24 000 BTU
41 to 50 m² 30 000 BTU

The BTU, what you need to know about cooling and heating your home with an Air Conditioning Unit from Mbombela Air Conditioners


The British Thermal Unit, or BTU, is an energy unit.

It is approximately the energy needed to heat one pound of water by 1 degree Fahrenheit.

1 BTU = 1,055 joules, 252 calories, 0.293 watt-hour or the energy released by burning one match. 1 watt is approximately 3.412 BTU per hour.

Also BTU is often used as a point of reference for comparing different fuels.

Even though they’re physical commodities and quantified accordingly, such as by volume or barrels.

They can be converted to BTUs depending on the energy or heat content inherent in each quantity.

BTU as a unit of measurement is more useful than physical quantity because of fuel’s intrinsic value as an energy source.

This allows many different commodities with intrinsic energy properties to be compared and contrasted.

For instance, one of the most popular is natural gas to oil.

BTU can also be used pragmatically as a point of reference for the amount of heat that an appliance generates.

The higher the BTU rating of an appliance, the greater the heating capacity.

As for air conditioning in homes, even though ACs are meant to cool homes.

BTUs on the technical label refer to how much heat the air conditioner can remove from their respective surrounding air.

Room/House Width, Length, and Ceiling Height

Obviously, a smaller area room or house with shorter lengths and widths require fewer BTUs to cool/heat.

However, volume is a more accurate measurement than area for determining BTU usage because ceiling height is factored into the equation.

Each three-dimensional cubic square foot of space will require a certain amount of BTU usage to cool/heat accordingly.

The smaller the volume, the fewer BTUs are required to cool or heat.

Insulation Condition

To begin with the thermal insulation is defined as the reduction of heat transfer between objects in thermal contact or in range of radiative influence.

The importance of insulation lies in its ability to lower BTU usage by managing as much as possible.

The inefficient wasting of it due to the entropic nature of heat.

It tends to flow from warmer to cooler until there are no longer temperature differences.

Generally, newer homes have better insulating ability than older homes due to technological advances as well as stricter building code.

Owners of older homes with dated insulation that decide to upgrade.

This will not only improve on the ability for the home to insulate (resulting in friendlier utility bills and warmer winters).

But also have the value appreciation of their homes.

The R-value is the commonly used measure of thermal resistance, or ability of heat to transfer from hot too cold through materials and their assembly.

The higher the R-value of a certain material, the more it is resistant to the heat transfer. In other words, when shopping for home insulation.

Higher R-value products are better at insulating, though they’re usually more expensive.

When deciding on the proper input of insulation condition into the calculator, use generalized assumptions.

A beach bungalow built in the 1900s with no renovations should probably be classified as poor.

A 3-year-old home inside a newly developed community most likely deserves a good rating.

Windows normally has poorer thermal resistance than walls.

Therefore, a room with lots of windows normally means poor insulation.

When possible try to install double glazed windows to improve insulation.

Desired Temperature Increase or Decrease with your Air Conditioning

To find the desired change in temperature to input into the calculator, find the difference between the unaltered outdoor temperature and the desired temperature.

As a general rule of thumb, a temperature between 70 and 80°F is a comfortable temperature for most people.

For example, a house in Mbombela/Nelspruit might want to determine the BTU usage during winter.

Atlanta winters tend to hover around 12°C with chances to reach -3°C occasionally.

The desired temperature of the dwellers is 24°C.

Therefore, the desired temperature increase would be between 12°c – 24°c to keep the home at a constant temperature

Homes in more extreme climates will obviously require more radical changes in temperature, resulting in more BTU usage.

For instance, heating a home in Lowveld winter or cooling a home during a Northern Cape summer will require more BTUs than heating or cooling a home in a more climate stable region.

Other Factors of Air Conditioning

Obviously, size and space of house or room, ceiling height, and insulation conditions are very important.

When determining the amount of BTUs required to heat or cool a house.

But there are other factors to keep in mind:

  • The number of dwellers residing inside the living spaces.

A person’s body dissipates heat into the surrounding atmosphere, requiring more BTUs to cool and fewer BTUs to warm the room.

  • Try to place the air conditioner condenser on the shadiest side of the house, which will usually be north or east of it.

The more the condenser is exposed to direct sunlight, the harder it must work due to the higher surrounding air temperature, which consumes more BTUs.

Not only will placing it in a shadier area result in greater efficiency, but it will extend the life of the equipment.

It is possible to try and place shady trees around the condenser.

But keep in mind that condensers also require good surrounding airflow for best efficiency.

Make sure neighboring vegetation does not interfere with the condenser, blocking air flow into the unit and choking it.

  • Size of air conditioning condenser.

Units too big cool homes too rapidly.

Therefore, they don’t go through the intended cycles, which were intentionally designed for out of the factory.

This may shorten the lifespan of the air conditioner.

On the other hand, if the unit is too small, it will run too often throughout the day.

Also overworking itself to exhaustion because it isn’t being used efficiently as intended.

  • Ceiling fans can assist in lowering BTU usage by improving air circulation.

Any home or room can be a victim of dead spots, or specific areas of improper airflow.

This can be the back corner of the living room behind a couch, the bathroom with no vent and a big window, or the laundry room.

Thermostats placed in dead spots can inaccurately manage the temperatures of homes.

Running fans can help to distribute temperatures evenly across the whole room or house.

  • The color of roofs can affect BTU usage.

Darker surface absorbs more radiant energy than a lighter one.

Even dirty white roofs (with noticeably darker shades) compared to newer, cleaner surfaces resulted in noticeable differences.

  • Efficiency decrease of the heater or air conditioner with time.

Like most appliance, the efficiency of the heater or air conditioner decrease with usage.

It is not uncommon for an air conditioner to loss 50% or more of its efficiency when running with insufficient liquid refrigerant.

  • Shape of the home.

A long narrow house has more wall than a square house with the same square footage, which means heat loss.

View more products here • Contact us for more • Like us on Facebook