![]() You don’t want everytime your system turns on your return grill starts whistling, or one room in your house is always to cold while another room is always to hot. The equipment that was selected will provide a certain amount of BTUs and move certain amount of air and it’s the job of the ductwork to distribute those that air to where it’s needed at different amounts per room all while doing so with as little restrictions as possible and as quietly and unnoticed as possible. Good duct design is probably the hardest part to get right. Now that equipment has been selected based on its rated capacity, it’s time for ACCA Manual D, duct design. If you live in Texas and have temps as high 105F that effects the rated capacity of the unit and has to be factored in. Example a 3 ton unit may have a capacity of 38,000 BTUs 75F, 36,000 BTUs 80F, 34,000 BTUs 85. Equipment manufacturers rate thier equipment to have a certain capacity at a certain design condition (I’m not going to go to in depth on this). After load calculations then on to ACCA Manual S for equipment selection. This will calculate the heat losses and gains of each room in the house and how many BTUs/hr of cooling and heating are needed to meet the demands/loads. ![]() For example, you could take 2 identical built houses and face one of them a different direction and it will change load calculations and possibly the system size by a 1/2 ton or more.Ī brief overview of system sizing starts with load calculations following ACCA Manual J. The doors, windows, insulation, air tightness, direction it faces, climate zone, and many other factors all effect the heat loss and heat gains. There are many factors that go into a load calculation. It sounds like the contractors built an efficient house and sized the hvac system appropriate for your home.Įvery building is unique and each one requires load calculations to properly size the hvac system to match it. Sizing an HVAC system by square footage is a very crude general rule of thumb. If you have any questions, you can pose them in the comments below. 5-Zone Mini Split ACs: About 4 Tons or 48,000 BTU.4-Zone Mini Split ACs: About 3 Tons or 36,000 BTU.3-Zone Mini Split ACs: About 3 Tons or 36,000 BTU.Dual Zone Mini Split ACs: About 2 Tons or 24,000 BTU.Single Zone Mini Split ACs: 1 Ton or 12,000 BTU.When you calculate the tonnage, you can check out several 1-4 ton mini-split air conditioners here: You can insert the area and calculate how many tons of AC you need per certain square footage. Here is the formula:ĪC Capacity (Tonnage) = (INSERT AREA IN SQ FT) * 0.0016 tons/sq ft You can use the ‘tonnage per square foot’ formula to calculate how many tons of AC you need. In general, for every 600 sq ft, you need 1 ton of AC. In short, if you’re looking to cool down a 600 sq ft area, you would need:ĪC Capacity = 600 sq ft * 0.0016 tons/sq ft = 1 Ton Simple answer: You need 0.0016 tons of AC per square foot. Here is the most frequently asked question about tonnage, BTU, and area (square footage): How Many Tons Of AC Per Square Foot? (Tonnage Per Square Foot) You can check which of these 12,000 BTU mini splits are the best to use here. You can check the best central air conditioners with prices of 2, 3, 4, 5, 6 ton AC units here.Įxample 3: 1 ton AC covers how many square feet?ġ ton AC covers 600 square feet. If you apply the 20 BTU per sq ft rule of thumb, you can see that a 3-ton air conditioner cools about 1,800 square feet spaces. How many square feet does a 3-ton air conditioner cover is quite easy to answer as well. A 1.5-ton AC unit covers 900 square feet of living space.Įxample 2: How many square feet does a 3-ton air conditioner cool? Example 1: 1.5 ton AC covers how many square feet?
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