What Size Mini Split for 300 Sq Ft

Jon Hubal
11/09/2023 2:51pm 5 minute read

So you’ve got a 300 sq ft space you want to heat and cool, but a full HVAC system seems like overkill. Buying a mini-split system is a perfect solution for a smaller area like yours. But with so many BTU ratings and features options, how do you choose the right size and model? Don’t worry; The Trade Table has you covered. In this article, we’ll walk you through determining the proper mini-split size for a 300-square-foot room based on your local climate conditions.

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Calculating the Right Mini Split Size for a 300 Sq Ft Room

Before buying a mini split for a 300 sq ft room, you'll want to consider a few factors.

Cooling Capacity

For cooling, you'll want a unit rated around 9,000 to 12,000 BTU. A 9k BTU unit can cool around 300 sq ft, while a 12k BTU unit gives you a bit more power for really hot days or rooms with lots of windows. Look for a unit that offers multiple fan speeds so you can adjust the cooling to your needs.

Heating Capacity

If you need heating, choose a unit rated at least 9,000 BTU since smaller units may struggle to heat efficiently. A 12k BTU unit is a good size for heating 300 sq ft. Look for a unit with an inverter compressor and variable heating capacities for the best temperature control.

Installation Considerations

A mini split this size will have an indoor unit about the size of a small painting. The outdoor compressor unit will be around 2 to 3 feet high. You'll want to place the indoor unit high on a wall, ideally near the center of the room you want to heat and cool for the best circulation. The outdoor unit can sit on the ground outside but should be placed in a spot with plenty of airflow and access to power.

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Recommended BTU Output for a 300 Sq Ft Room

For a 300 sq ft room, you'll want a mini split with an output of at least 9,000 BTU to effectively heat and cool the space.

A 9,000 to 12,000 BTU unit should do nicely for a room this size. Anything less won’t have enough power, and anything more will be overkill and less energy efficient.
Consider the room’s insulation and how much sunlight it gets. If it’s an attic or basement space without much insulation or lots of windows, go for a unit with 10,000 BTU or higher. For a well-insulated interior room, 9,000 BTU should suffice.
Think about how you use the room. If it’s an office or bedroom only occupied a few hours a day, a smaller unit can work. But for a living room or kitchen in frequent use, opt for more power to keep conditions comfortable.
Look for a unit with an inverter, which allows it to adjust the temperature precisely. Non-inverter units turn on and off frequently, which can lead to temperature swings. Inverter models provide consistent cooling and heating for the best comfort.
Consider additional features like a timer, multiple fan speeds, auto mode, and a remote control for convenience. Some units also have built-in air filters and ionizers for better air quality.

Best Mini Split Options for 300 Sq Ft Based on Budget

For a 300-square-foot space, you have several good mini-split options to choose from based on your budget.

If cost is a concern, a 9,000 to 12,000 BTU unit should work well for a room this size and won’t break the bank. Popular, affordable brands are Midea, Pioneer, and Friedrich. A basic 9,000 BTU model from one of these brands will typically run between $600 to $1,000. While not the most energy-efficient, it will get the job done on a budget.

For the best value, look for an inverter-driven mini split in the 12,000 to 18,000 BTU range from brands like Daikin, LG or Bosch. Models in this range offer good energy efficiency and performance for the money. Expect to pay $1,200 to $2,000 for a unit of this size and quality. An inverter model is more efficient and responsive, so you’ll get faster heating and cooling when you need it.

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Premium High-Efficiency Mini Splits: Daikin, Mitsubishi, Fujitsu

If you want a premium, high-efficiency mini split for the best performance, choose an 18,000 to 24,000 BTU unit from Daikin, Mitsubishi, or Fujitsu. These brands are leaders in mini-split technology and quality. Their inverter-driven units can cost $2,500 to $4,000 for a 300 sq ft space, but you’ll get powerful, whisper-quiet cooling and heating with maximum energy efficiency.

In the end, the mini-split you choose comes down to how much you're willing to spend for the level of performance and efficiency you want. But for most 300 sq ft rooms, an efficient inverter-driven mini split in the 12,000 to 18,000 BTU range should offer an ideal balance of value and comfort.

GREE Vireo Gen3 12K BTU 25 SEER Wall Mount Mini-Split Single Zone Heat Pump - 3VIR12HP115V1A

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