Ductless Mini Split Buying Guide

Ductless mini split systems are among the most efficient, flexible, and quiet ways to control the climate in your home. Whether you're tackling a renovation or overseeing a complex project, Ferguson Home provides the personalized support and top brands you need.

This guide walks you through selecting the best mini split system, combining a curated selection with expert guidance at every step.

What is a Mini Split?

A mini split, often called a mini split heat pump, is an HVAC solution that consists of an outdoor unit and one or more indoor units, connected by a small refrigerant line set—no bulky ductwork required.

Exceptional Efficiency

Mini split heating and cooling systems utilize inverter-driven compressors and advanced control algorithms. Unlike traditional systems that constantly cycle on and off, inverter technology delivers the precise amount of cooling or heating needed. This reduces waste, minimizes temperature swings, and can save 30% or more on energy bills.

Superior Comfort and Dehumidification

Variable-speed operation maintains continuous heating or cooling, virtually eliminating temperature fluctuations. Mini splits also actively remove moisture the entire time they run, enhancing overall home comfort.

Quiet Operation

With sound ratings as low as 19 dB, mini splits are quieter than a whisper—often going unnoticed.

Choosing Your System Type: Heating vs. Cooling

Before selecting equipment, determine the function you need.

Cooling Only

Cooling-only mini split air conditioner systems provide air conditioning without heating capability. They are ideal for warm climates or special applications like server rooms where heating is unnecessary.

Heat Pump

Heat pump mini split systems provide both cooling and heating by reversing the refrigerant flow. They are the most popular choice, suitable for year-round comfort in nearly any climate.

Mini split heat pumps are versatile, though performance can decline in extreme weather—both high heat and freezing cold. Proper sizing is essential to maintain efficiency during peak seasons.

Defining Your Zones: Single-Zone vs. Multi-Zone

Zoning is a key benefit of mini splits, providing flexible, independent control over different areas of your home.

Single-Zone

Single-zone mini split systems are straightforward, consisting of one outdoor unit connected to one indoor unit. They are ideal for heating and cooling unconditioned spaces such as garages or additions, or for supplementing under-served rooms. Note that single-zone systems cannot be converted to multi-zone later.

Multi-Zone

Multi-zone systems consist of a single outdoor unit with up to eight indoor units, delivering a combination of control, comfort, and efficiency that no other system on the market can match.

Selecting Indoor Mini Split Units

The type of indoor unit you choose depends on your home's layout and aesthetic preference.

• Wall-Mounted: The most common and cost-effective option.
• Ceiling Cassette: Installed flush with the ceiling for a discreet look.
• Concealed Duct: Hidden within the ceiling or walls, offering the appearance of a traditional ducted system.
• Floor-Mounted: Ideal for spaces with low wall clearance or for maximizing floor-level heating.
• Ducted Air Handler: Uses a single indoor air handler connected to a network of ducts that distribute conditioned air throughout the home or specific areas.

What Size Mini Split Do I Need?

Proper sizing is the most important step for achieving optimal results. A system that's too small will run constantly, while one that's too large will cycle on and off too frequently—reducing efficiency and dehumidification.

Sizing is determined by the BTU (British Thermal Unit) rating. The required BTU depends on the size and characteristics of each room, including insulation, windows, and ceiling height.

Tip: Use a reliable mini split sizing calculator or consult with a qualified HVAC contractor. Determine the specific BTU requirements for each individual room you plan to condition.

Mini Split Installation and Support

While mini splits are customizable and efficient, HVAC equipment installation is highly technical. Working with a qualified HVAC contractor ensures years of reliable service and maintains your manufacturer's warranty coverage.

Don't forget necessary components like line sets, condensate pumps, and controls.