For example, if your room is around 2,000 square feet, you’d require a system with a BTU rating of 4.3 out of 5. HVAC contractors use a rule of thumb to allocate 20 BTUS to every square foot of space inside your home. Evaluate your sun exposure and how much coverage you receive from trees and surrounding components. Check the home’s insulation to ensure that everything is in excellent condition. Alternatively, conduct the measurements yourself by multiplying width and length for all rectangles within the home.Īdd those totals to have a figure.
You can find this information on a blueprint or closing documents. Once you do that, you’d need the square footage of your property.
Southern states are more prone to humidity and would have to factor this into their calculation. The first step to an efficient, powerful air conditioner is identifying the region’s climate. Usually, room units require 120 Volt or 240 Volt circuits, while standard equipment requires 12 Volt outputs. Room height, windows, shade, and insulation are other factors that dictate what BTU rating you require for your home.Īdditionally, the home’s electrical system must meet the system requirements.
If you had to calculate the size of the HVAC system on the size of the space, you’d have to assign around 20 BTU per square foot of living area. A true calculation of the load of the home goes beyond the size and factors in other elements such as location and position in relation to the sun, amongst others. Professionals refer to this as the load of the home. To gain a clearer picture of how big or small a system you require, a technician must calculate the cooling or heating capacity to ensure proper comfort levels of the occupants. Secondly, when the system starts overcompensating for its lack of BTUs, it will drive your energy bill up and cause several parts to malfunction ahead of time. The first issue is your house will never be at the optimum temperature simply because the system doesn’t have the capacity. HVAC technicians refer to this issue as short-cycling, which causes excessive wear and tear on the equipment.Ĭonversely, acquiring an air conditioner that’s too small for a space can lead to other problems. Since the system decreases the indoor temperature faster than usual, the air conditioner will continuously start and stop to keep the air at an ideal temperature. A cooling unit that’s too large for the space will result in a waste of energy. HVAC systems, particularly air conditioners, come with different BTU ratings, which means they have varying capabilities. What Happens With the Incorrect Size System However, it’s critical to understand that installing a larger system for a small room isn’t necessarily a positive. The higher the BTU rating your system has, the more powerful it is during operation. In terms of air conditioners, the BTU rating determines how much heat the system will remove from the air in a room per hour. When shopping for a new air conditioner, you need to ask relevant questions such as, ‘how many BTU per square foot do I need?’. To further define BTU, it refers to the amount of thermal energy that’s required to either cool or heat the temperature of one pound of water by a single degree Fahrenheit. Its definition is British Thermal Unit that ultimately measures the effectiveness of the HVAC system. Whenever there’s a conversation about air conditioning or heating, you would have heard people refer to BTU.
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