Each person produces about 500 BTU/hr of heat for normal office-related activity. Volume = Width X Length X Height (cubic feet) Step 2Įstimate the number of people (N) that will usually occupy this room. This is done by measuring the length, width and height of the room in feet and multiply all the three dimensions together. Use this result to compare with the calculation done by the air conditioning contractors for your own checking purposes.įind the volume of your room in cubic feet. However, there is a simple rule of thumb that you can use to estimate the required cooling capacity for your room. The higher the listed BTU/hr, the greater the cooling capacity.Īir Conditioning Calculations - Rule Of ThumbĬalculating the cooling capacity needed for your room is a complicated process as there are many factors to consider. With better technology, some machines are able to remove 10,000 BTU/hr of heat with the same capacity. When choosing an air conditioner, usually a 1 HP (horse power) equipment is able to remove 9,000 BTU/hr of heat. 1 BTU/hr is the heat energy needed to increase 1 pound of water by 1☏. The unit used to measure heat load is BTU/hr. Study shows that this combination of temperature and RH is the most conducive for the human body. The typical design is set to 24☌ temperature and 55% Relative Humidity. The cycling on and off of the compressor will lead to shorter life span of the compressor besides having to spend more on the unit price and installation cost.Īn undersized unit will not be able to cool the room properly and more so if the weather is hot.Ĭooling capacity for a room is defined as the heat load in a room that have to be removed in order to achieve a certain room temperature and humidity. On top of that, the electricity bill will be high as the compressor turns on and off too often.Įvery time the on/off type of compressor starts to run, its power consumption is 6 times higher than when it is running steadily. This includes taping, mudding and sanding up to preparation to paint.It will also cause discomfort to the occupants as the dehumidfication of the room is not properly done. Drywall cost of Material (wall board) for a room including the walls and ceiling.Drywall to Cover a Room including the walls and ceilings.Surface Area of the Room including the walls and ceiling.

Compute the number of Decking Boards to cover the deck or floor.

Compute the Number of 4x8 Sheets to cover the Deck or Floor.

Number of 4x8 or 4x12 Sheets for a Room.

Number and Length of wall top and bottom wall plates.

Number and Length of Rafter and Collar ties.

Number of drywall sheets needed for a room.

Surface area of the interior walls and ceiling of a room.

Surface area of the interior walls of a room.

Number of gallons to paint or primer a room.

Pricing for a 5/8 inch 4x12 sheet of drywall is $20.48.

Pricing for a 1/2 inch 4x12 sheet of drywall is $18.48.

Pricing for a 5/8 inch 4x8 sheet of drywall is $14.28 USD.

Pricing for a 1/2 inch 4x8 sheet of drywall is $11.48.

The pricing per sheet used in this estimator is as follows: Note: The above does not include the area of the floor.

A = Total Surface Area of a Room including walls and ceiling.

This totals to compute the area of the interior of the room in the following equation:

The area of the ceiling, where Area = L*W.The area of two walls, where Area = W*H.The area of two walls, where Area = L*H.These areas can be determined by the dimensions of the room. The surface area of the interior of a room including the walls and ceiling is the sum of the area of the walls and the area of the ceiling. However, this can be automatically converted to other area units (e.g. Room Surface Area (A): The calculator will return the total surface area ( A) of the interior room including the walls and ceiling in square feet. INSTRUCTIONS: Choose units and enter the following: The Room Surface Area calculator computes the surface area of the interior of a rectangular room including the walls and ceiling based on the length, width and height of the room.

Room volume calculator