You've decided to add a mini split air conditioner to your small home, and now you need to determine what size unit is right for the job. As a general rule of thumb, you'll want a unit that can properly condition the entire area of your home for maximum comfort and efficiency. For a space of around 750 sq ft, a smaller mini split, typically in the 9,000 to 12,000 Btu range, should work well for most zones and layouts. However, there are a few factors to consider before settling on a particular size.
How Much BTU Do I Need for 750 sq ft?
To properly size a mini split for 750 square feet, you will need to determine the appropriate BTU rating. BTU stands for British Thermal Unit and measures the amount of energy required to heat or cool one pound of water by one degree Fahrenheit.
For 750 square feet, you will want a unit with at least 9,000 BTUs to effectively cool the space. However, there are a few factors to consider:
Room Layout and Insulation: An open floor plan with vaulted ceilings will require more BTUs than a space divided into multiple rooms. The level of insulation also impacts the required BTU. More insulation means fewer BTUs are needed.
Number of Windows or Doors: More windows and doors result in greater heat/cool loss, necessitating a higher BTU unit.
Occupancy: The more people occupying the space regularly, the higher the BTU should be. Body heat and activity generate warmth requiring greater cooling capacity.
Local Climate: Spaces in hotter climates will require more BTUs for cooling than spaces in milder weather.
Usage: Spaces used often as living rooms or bedrooms will require higher BTU than spaces used occasionally like storage rooms.
- Use a Mini-Split Sizing Calculator: Consider using a mini-split sizing calculator to find the perfect size mini-split for your needs!
Recommended Mini Split Sizes for 750 Sq Ft Homes
For a 750-square-foot home, we recommend a mini-split system with a capacity between 18,000 to 24,000 BTU for optimal heating and cooling.
A 1.5-ton (18,000 BTU) or 2-ton (24,000 BTU) unit should suit a small home of this size well. A 1-ton (12,000 BTU) mini split may struggle to maintain the desired temperature during extreme weather, while a 3-ton (36,000 BTU) system is too large and will short cycle, reducing efficiency and possibly humidity control.
The number of rooms and layout of your home also plays a role in choosing the right size. A mini split with multiple air handlers, called a multi-zone system, may be needed for a two-story house or one with an open floor plan. For the best coverage, place the outdoor unit in a central location, near the middle of the house. The air handlers should be in the rooms where you spend the most time.
In addition to capacity, consider the mini split's energy efficiency rating, like the Seasonal Energy Efficiency Ratio (SEER). A higher SEER, such as 18 or more, means lower energy usage and bills. An ENERGY STAR® rated unit meets strict efficiency guidelines set by the EPA.
Single Zone vs Multi Zone Mini Splits: Which Is Better for 750 Sq Ft?
For a space of 750 square feet, you have two good options for a mini-split system: a single-zone or a multi-zone system. Each has its pros and cons to consider based on your needs.
A single zone mini split system utilizes one outdoor unit connected to one indoor unit to control the temperature in your entire 750 sq ft space. This is typically the more affordable and energy-efficient option for smaller areas. However, it may not provide the level of control or flexibility you desire. A single temperature setting will be applied to the entirety of your space.
On the other hand, a multi-zone mini-split system uses one outdoor unit connected to multiple indoor units, each controlling the temperature of its zone. This allows you to set different temperatures for separate areas of your space for maximum comfort. For example, you may want it cooler in your bedroom and warmer in your living room. Multi-zone systems do tend to cost more upfront and use slightly more energy.
For a 750-square-foot space, a two-zone or three-zone multi-split system would work well to divide the area into separate temperature-controlled zones. A two-zone system could separate the space into a bedroom zone and a living area zone. A three-zone system could further split the living area into two zones, for example, a living room zone and a dining/kitchen zone.
Ductless Mini Split Brands and Models for Small Homes
Cooling and Heating Capacity
For a home of this size, a ductless mini split with a 12,000 to 18,000 BTU cooling capacity and a 10,000 to 15,000 BTU heating capacity should be sufficient for most small homes. Models in this range can typically cool or heat 350 to 700 square feet. Check the specifications of any models you’re interested in to ensure the capacity will properly meet the needs of your specific home.
Number of Zones
A single-zone ductless mini split with one indoor unit should adequately heat and cool a small home. However, multiple zones with two or more indoor units may provide more even temperature control throughout the home. Multiple zones also allow you to control the temperature in each zone separately.
Look for ductless mini splits with a high seasonal energy efficiency ratio (SEER) of 18 or above and a high heating seasonal performance factor (HSPF) of 10 or above. More efficient units will have lower operating costs over time. Energy Star-certified models must meet efficiency standards and can save between 10 to 50 percent on energy costs versus standard equipment.
Installation and Operating Costs of Mini Splits for 750 Sq Ft
The initial purchase and installation of a mini-split system for a 750-square-foot space will vary depending on the brand, model, and contractor. On average, a unit sized appropriately for a 750-square-foot area will cost between $1,500 to $4,000. Professional installation will add another $500 to $2,000 to the total cost.
Operating a mini split to heat and cool a 750-square-foot area will cost between $30 to $150 per month, depending on your climate and energy rates. Mini-splits are very energy efficient since they only heat or cool the rooms you want. Units with a higher SEER (Seasonal Energy Efficiency Ratio) and HSPF (Heating Seasonal Performance Factor) rating will be more efficient, resulting in lower operating costs.
It’s a good idea to compare the initial cost versus long-term energy savings to determine the best system for your needs. Often spending slightly more upfront for a higher efficiency unit will save you money over the lifetime of the system. Look for Energy Star-rated units with a SEER of at least 15 and HSPF of 8.5 or higher for the best efficiency.
The operating costs can also be lowered by properly insulating your space, keeping filters clean, setting the thermostat to an efficient temperature, and choosing the appropriate size unit for your square footage. Oversizing a unit will cause it to cycle on and off frequently, reducing efficiency. Consider a multi-zone system to maximize comfort and energy savings.
So, What Size Mini Split For 750 Sq Ft?
As you have learned, determining the right size mini-split for your 750-square-foot space involves considering several factors. The most important is choosing a unit with enough BTUs to properly heat and cool the area, selecting a model with multiple fan speeds so you can adjust the airflow, and picking a unit with a sufficient SEER rating to maximize energy efficiency and lower utility bills. While it may seem complicated, taking the time to assess how you use the space and your local climate conditions will ensure you end up with a mini split that suits your needs and provides comfortable temperature control for years to come. With some research and planning on the front end, you can enjoy the benefits of mini-split technology tailored to your specific requirements.