10 Year Parts & Labor warranty guaranteed! Review our offers & Save! >> Read More

Skip navigation


Serving the Bozeman & Helena Areas

24/7 Emergency Service


Serving the Bozeman & Helena Areas
Get a Free Estimate!

Ambient Air Solutions Blog

How Many Mini Splits Do You Need?

Ductless Technician on Ladder

If you’ve decided on a ductless AC installation in Bozeman, MT, you’re undoubtedly excited about the precise zone control you’ll achieve throughout your home. However, that ability to customize the temperature of every room in your home is dependent on the system being properly sized for your home.

One of the most common questions we get about ductless mini splits is, “How many mini splits will I need for my new system?” The answer depends on certain factors such as how many rooms your home has, the square footage, and your home’s insulation. Let’s break it down even further and look at the factors influencing the answer to this question.

Factors Influencing the Number of Mini Splits Needed

Home Size and Layout

The first thing we’ll need to do to determine how many air handlers are needed is to assess the size and layout of your home. We’ll start by calculating the total square footage of the area you want to heat or cool. Homes with open floor plans may require fewer units, as air can circulate more freely, while homes with many individual rooms may need more units to ensure adequate coverage. We’ll also take into consideration if your home has other sources of heating such as a fireplace.


In Montana, where the winters are extreme and you rely on your heating system throughout much of the year, you need an adequate number of air handlers to make sure the rooms you spend the most time in receive enough heating power. For example, a large, combined living and dining space that is more than 500 square feet and has no other source of heating (like a fireplace) might require a more powerful mini split for that room.


One of the biggest benefits of mini splits is that they don’t require air ducts which means you won’t be losing conditioned air to ductwork. However, your home must still be well insulated. The quality of your home’s insulation plays a crucial role in determining the number of mini splits your home will need. Well-insulated homes retain temperature better, reducing the load on your new system.

British Thermal Units

BTU, or British Thermal Unit, is a measure of heat energy. The capacity of a mini split is measured in BTUs per hour, indicating how much heat the unit can add or remove from a space. 

Here is a general estimate of how many BTUs are needed for specific rooms, taking into consideration average square footage. Large rooms or spaces with high ceilings may require more powerful units, while smaller rooms can use units with lower BTU ratings. Here are some general examples.

  • Living Room (500 sq ft): 12,000 BTU
  • Kitchen (300 sq ft): 9,000 BTU
  • Bedroom 1 (250 sq ft): 9,000 BTU
  • Bedroom 2 (250 sq ft): 9,000 BTU
  • Bedroom 3 (250 sq ft): 9,000 BTU
  • Bathroom and Hallways (450 sq ft combined): 12,000 BTU

Still not sure how many mini splits you’ll need? Leave it to the NATE-certified technicians at Ambient Air Solutions! 

Contact Ambient Air Solutions today for professional ductless HVAC installation in Bozeman, MT. Simplifying Heating & Cooling!

Comments are closed.