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What Size System Do I Need?

As a home or business owner, you know that choosing the right heating and cooling system ensures your comfort. If you're shopping for a new system or need to find a replacement unit for your current system, you're likely juggling many questions. It can be difficult to pick a unit that meets your needs without exceeding your budget. In order to have a successful shopping experience, remember to pay close attention to details such as unit size and energy ratings.

Choosing The Right HVAC System for Your Needs

Every home and business owner has different heating and cooling needs. Before you begin shopping for a new air conditioner, take some time to jot down what you're looking for in a cooling system. As a first step, identify the type of system that you'd like to use. Do you want to install a central air system with ductwork? Do you prefer to avoid ductwork and use a high-efficiency ductless system? Making these basic decisions will ensure that you have a successful, low-stress shopping experience. Remember that working with a licensed HVAC dealer is the best way to find the system that will provide total comfort in your home or business.

Is Ductless Air Conditioner Sizing Important?

Many shoppers overlook the importance of air conditioner sizing when purchasing a new unit. However, the size of the unit that you need should be one of the first things that you consider when shopping for HVAC equipment. A correctly sized unit will provide excellent heating or cooling for your space while providing efficient performance. If you neglect sizing and choose a unit that is too large, you may find that you're always cold and that you're stuck paying a very high electricity bill. If you choose a unit that is too small, you may find that you're always sweating and that you must run your AC around the clock to feel cool at all.

Calculating Your Cooling Needs

The first step in determining the size of unit that you need is to determine the square footage of the area that you are going to cool. If you're choosing a unit for your whole home or business, you can simply use the total square footage of your space. If you want to heat or cool only one room, calculate the square footage for that space by multiplying the length of the room by the width of the room. Home and business owners whose ceilings are more than eight feet high should ask an HVAC professional to complete load calculations on their behalf. Cooling demands in spaces with high ceilings are generally different than demands in spaces with low or regular-height ceilings.

Understanding System Sizing

The cooling capacity of all types of air conditioners and heat pumps is described according to British Thermal Units (BTUs). Once you've calculated the total square footage of the area that you need to cool, you'll be able to convert your cooling demands into BTUs. Choosing a unit with the BTUs needed to efficiently cool your space will provide for total comfort while helping you control energy bills.

What Size Mini Split Do I Need?

The chart below describes how many square feet of cooling power units with different BTU ratings offer. Use this chart as a guide when shopping for your new unit.

  • 5,000 BTUs will cool up to 150 square feet.
  • 6,000 BTUs will cool up to 250 square feet.
  • 7,000 BTUs will cool up to 300 square feet.
  • 8,000 BTUs will cool up to 350 square feet.
  • 9,000 BTUs will cool up to 400 square feet.
  • 10,000 BTUs will cool up to 450 square feet.
  • 12,000 BTUs will cool up to 550 square feet.
  • 14,000 BTUs will cool up to 700 square feet.
  • 18,000 BTUs will cool up to 1,000 square feet.
  • 21,000 BTUs will cool up to 1,200 square feet.

Remember that it's important to buy a unit that is rated for at least the amount of space that you need to cool. For example, if you need to cool 600 square feet, choose a 14,000 BTU unit instead of a 12,000 BTU unit. Remember that the best ductless air conditioning systems only provide optimal efficiency when properly sized.

Ductless Heat Pump Sizing

Ductless heat pumps are sized in exactly the same way as all other Mitsubishi Electric ductless air conditioning systems. Refer to the above BTU chart to determine what size heat pump you need. You can use the chart to size a heat pump that you will use for both heating and cooling.

Working with Ductless Split System Installation Specialists

Working with your local Mitsubishi Electric Diamond Contractor is the best way to ensure that you find the air conditioning system to meet your needs. Your local dealer will be happy to walk you through your options and assist you with sizing.