How does a mini-split work?

A mini-split transfers heat between an outdoor compressor and indoor air handlers using refrigerant lines. In cooling mode, it absorbs heat from inside and releases it outside. In heating mode, it absorbs heat from outside air (even in cold weather) and releases it inside. The system uses inverter-driven compressors that ramp up and down to maintain a consistent temperature, more efficient than the on/off cycling of traditional HVAC.

How long do mini-splits last?

With proper maintenance, a mini-split lasts 15–20 years. Regular filter cleaning (monthly during heavy use), annual professional servicing, and keeping the outdoor unit clear of debris all extend system life. Mitsubishi systems we install come with 12-year warranty options covering compressor and parts.

Are mini-splits noisy?

No. Mini-split indoor units operate at 19–30 decibels, comparable to a whisper or rustling leaves. The compressor sits outside, so the loudest component is away from your living space. This makes mini-splits significantly quieter than window units (50+ dB) and most central air systems (40–50 dB).

Are all mini-splits ductless?

No. The term mini-split refers to the compact split design: an outdoor compressor paired with indoor air handlers. Most are ductless wall-mount units, but ducted mini-splits use short duct runs from a concealed air handler in a closet or attic. You can even mix ductless and ducted heads on the same outdoor unit.

What is the best brand for mini-split systems?

Mitsubishi Electric is widely considered the industry leader in mini-split technology. They pioneered cold-climate ductless systems and hold more patents in mini-split technology than any other manufacturer. UniColorado is a Mitsubishi Diamond Contractor (the highest dealer tier), which gives our customers access to extended 12-year warranties and priority technical support.

What is a cooling-only mini-split?

A cooling-only mini-split is a ductless air conditioner without heating capability. These AC-only units cost $500–$1,500 less per zone than heat pump models and are ideal for Denver homes that already have a furnace but need targeted cooling in specific rooms. Perfect for garages, sunrooms, bonus rooms, or server rooms.

Are cooling-only mini-splits cheaper than heat pump models?

Yes at list price—cooling-only mini-splits cost $500–$1,500 less per zone than heat pump models. A single-zone cooling-only system runs $4,500–$8,500 installed vs $5,000–$10,000 for a heat pump. However, heat pump models qualify for Xcel Energy rebates that can make them cheaper out-of-pocket than cooling-only. Cooling-only makes sense only when Xcel rebates don't apply (e.g., ineligible area).

Do cooling-only mini-splits qualify for rebates?

Cooling-only mini-splits qualify for fewer rebates than heat pump models. They don't qualify for Xcel Energy heat pump rebates or the (now-expired) federal 25C tax credit. However, they may qualify for smaller efficiency incentives. The trade-off is lower upfront cost. Even without rebates, cooling-only units often cost less out-of-pocket than rebated heat pump models.

How much does mini-split installation cost in Denver?

Mini-split installation in Denver costs $5,000-$10,000 for a single-zone system and $9,000-$15,000 for multi-zone systems. Price depends on the number of indoor units, system capacity, and installation complexity. As a Mitsubishi Diamond Contractor, we offer systems with 12-year warranties. Rebates and incentives can help offset the initial cost.

How much does a mini split cost in Denver?

A single-zone mini split (one indoor unit + outdoor condenser) costs $5,000-$10,000 installed in Denver. Multi-zone systems (2-4 indoor units) cost $9,000-$18,000. Heat pump models (heating+cooling) cost $500-$1,500 more per zone than cooling-only units. Price includes equipment, installation, permits, and refrigerant lines. Heat pump mini splits qualify for Xcel Energy and federal rebates; cooling-only models do not.

Can a mini split heat a whole house?

Yes, but layout matters. Multi-zone mini splits can heat a whole house if rooms are open-plan or connected. A 2,000 sq ft home typically needs 3-4 indoor units (one per major zone: master bedroom, living area, secondary bedrooms). Closed-off rooms with doors make whole-home coverage harder. Most Denver homeowners use mini splits for primary living areas (bedrooms, office, living room) and keep existing furnace for backup or rarely-used spaces.

Mini-split vs central AC: which is better for my home?

Mini-splits are better for homes without existing ductwork, room additions, or targeted zone control. Central AC is better if you already have ductwork and want whole-home cooling. Mini-splits are 15-30% more energy efficient than central systems because they eliminate duct losses. They're also quieter (19-30 decibels) and allow independent temperature control for each room.

Do mini-splits work for heating in Colorado winters?

Yes. Cold-climate mini-split heat pumps work efficiently down to -13°F. Models like the Mitsubishi Hyper-Heat provide reliable heating throughout Colorado winters. They use inverter-driven compressors to maintain heating capacity even in extreme cold. Many homeowners use mini-splits as their primary heating and cooling system, eliminating the need for a furnace.

How many mini-splits do I need for my home?

For targeted comfort, one mini-split per room or zone is typical. Most homeowners install units in bedrooms and main living areas (2-4 units total). For whole-home coverage in a 2,000 sq ft house, you'd typically need 3-4 indoor units connected to one outdoor condenser. We assess your home's layout during a free estimate to recommend the right configuration.

Are mini-splits energy efficient compared to traditional HVAC?

Yes. Mini-splits achieve SEER ratings of 18-30, compared to 14-18 for traditional central AC. They eliminate 25-30% energy loss from ductwork and use variable-speed compressors that adjust output based on demand. This results in 15-30% lower energy costs compared to traditional HVAC systems. Mini-splits also provide both heating and cooling in one system.

Can mini-split heat pumps work in cold climates?

Yes. Cold climate mini-split heat pumps like the Mitsubishi Hyper-Heat series maintain full heating capacity down to -13°F using enhanced inverter compressors and vapor injection technology. In Denver, where winter design temperatures hit 5°F and overnight lows regularly reach the teens, cold climate models provide reliable primary heating without backup. Standard models lose significant capacity below 30°F. For Colorado installations where heating is the goal, cold climate certification is essential.

Can I use a mini-split to supplement my existing heating system?

Absolutely. Adding a mini-split to supplement your furnace or boiler is one of the most cost-effective comfort upgrades for Denver homes. Common scenarios: adding cooling to a home with only a furnace, conditioning a room addition or finished basement, or boosting comfort in a master bedroom or home office that runs hot or cold. A single-zone mini-split ($5,000–$10,000) handles most supplemental applications. The mini-split and your existing system operate independently, no integration required.

Can I replace my boiler with a mini-split?

Yes, and it's one of the best applications for ductless mini-splits. Older Denver homes with boiler/radiator systems have no ductwork, making mini-splits the most practical replacement path. A 3-zone cold climate system ($13,000–$20,000) covers the main living areas with both heating and cooling, an upgrade over boilers, which only heat. The installation is non-invasive: small 3-inch wall penetrations for refrigerant lines, no demolition or ductwork construction. You also gain zone control, air filtration, and eligibility for electrification rebates.

What size mini-split do I need?

Mini-split sizing depends on room square footage, insulation quality, and Colorado's heating climate. A rule of thumb: 30 BTU per square foot for heating in average-insulation Denver homes. A 200 sq ft bedroom needs a 6,000 BTU head; a 400 sq ft living room needs a 12,000 BTU head. But altitude (5,280 ft), window exposure, and ceiling height all affect the calculation. Use our zone planner tool above for room-by-room estimates, or schedule a free in-home assessment where we do a professional load calculation for your specific home.

For Homes With No Ductwork

Ductless Mini-Split Installation

Whether you need ductless cooling for a room addition, whole-home heating and cooling, or just AC for spaces without ductwork, ductless mini split systems are the perfect choice. UniColorado offers both heat pump and cooling-only models with 12-year warranties.

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Ductless Mini-Split Installation

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Ductless MiniSplit Installation

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The basics

What is a MiniSplit?

A mini-split is a split system with a compact outdoor unit. It can be ductless (wall-mounted, floor-mounted, or ceiling cassette units) or ducted (air handlers connected to ductwork). Ductless mini-splits deliver conditioned air directly into specific zones with no ductwork, ideal for homes without ducts, additions, or targeted comfort. Ducted mini-splits use standard air handlers connected to ductwork, just like traditional HVAC. The 'mini' refers to the outdoor unit size, not the indoor equipment.

The smartInvestment

Why a Mini-Split is the Right Choice for Your Home

Perfect for Any Space

No ductwork needed. Ductless mini splits connect indoor and outdoor units with a small conduit, making them ideal for older homes, additions, or rooms without existing ducts. Flexible placement with wall-mounted, floor-mounted, or ceiling-cassette options.

Zoned Comfort & Whisper-Quiet Operation

Independent temperature control for each room. Cool or heat only the rooms you need, no more paying to condition empty spaces. Ultra-low noise levels with the compressor located outside and advanced fan technology inside.

Energy Efficiency & Savings

No duct losses. Traditional HVAC systems can lose significant energy through duct leaks. Ductless mini splits eliminate this issue, delivering conditioned air directly to each room. Most models use variable-speed compressors, adjusting output to maintain a consistent indoor climate.

Low Maintenance & Healthier Air

Minimal upkeep without ducts to clean. Regular maintenance is as simple as changing or washing filters, plus occasional professional servicing. Advanced filtration systems capture dust, pollen, and other allergens, helping you breathe easier.

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CompareModels

Mini-Split Models We Install

Mitsubishi Electric systems with 12-year warranties. All models include professional installation, permits, and refrigerant line sets.

Mitsubishi MSZ-GX

Standard efficiency wall-mount
Up to 18 SEER2
Heating to ~30°F
Best for cooling-focused applications
Quiet: 19 dB indoor unit

Mitsubishi MSZ-FX Hyper-Heat

Cold climate wall-mount
Up to 30+ SEER2 / 13+ HSPF2
Full heating to -13°F
Best for Colorado year-round use
3D i-see Sensor for targeted comfort

Mitsubishi MXZ Multi-Zone

2–8 indoor heads per outdoor unit
Mix wall-mount, ducted, cassette heads
Cold climate Hyper-Heat available
Best for whole-home coverage
Individual room temperature control

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What People Wonder About MiniSplits

Common questions about ductless mini-split systems in Denver. Can't find what you're looking for? We're a phone call away.

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Google Reviews (138)

Kent D.

We recently built an ADU and UniColorado installed our heatpump unit and we couldn't be happier with the process. They also helped us with the tax rebates/credits available and still offered a very competitive price compared to the other companies we vetted out. Would highly recommend.

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Jeff M.

Installed Bosch Heat pump and found UniColorado personnel to be very knowledgeable and professional in sales and installation. Fairly priced and efficient in installation with excellent communication through the process.

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Patrick B.

UniColorado did a great job replacing our old furnace with a new heat pump + backup furnace system. We've had it for a couple months and it's been working flawlessly. They had great communication and were very easy to work with. They also had the best pricing of all the companies I quoted.

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Frances C.

I could not have asked for a better company: all communication was respectful, understanding and full of detailed information in response to specific questions. I was given on site photos, names and brands of products to research,, even links to apply for rebates, as well as payment options. Every part of the project was explained to me. The onsite project manner made a point of assuring me the exact placement I requested for cold climateheat pumps was guaranteed. I could go on and on. Suffice it to say: I highly recommend this exceptional state of the art company. Thank you.

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Dave P.

These guys are fantastic! I found them after being turned off by the hard sell from another company. Professional--they listened, worked with me to meet my needs and ended up saving us a lot of money on a whole heat pump system. Quick, clean install... I'll be calling them from now on for anything heat related. I've already recommended them to a friend and its only been a week.

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Why UniColorado?

Mini-splits solve problems ducted systems can't: additions without ductwork, rooms the main system misses, garages, basements. We've installed thousands of Mitsubishi hyper-heat units across the Denver metro, and they're our go-to recommendation for targeted heating and cooling. Each system is sized to the room, not the house, so you're not paying to condition space you don't use. We handle rebate paperwork upfront. You see the savings at signing.

2013

Our first hyper-heat install

2016

Early Lennox cold-climate adoption

2024

Bosch IDS Ultra install

2026

Latest cold-climate tech

30+

Municipalities

Master

Licensed & Certified

1000s+

Happy Homeowners

Mini-Split Certified

Technicians

100% Satisfaction

Guarantee

Up Front Pricing

No hidden fees

$5M+

Saved for homeowners in 2025

$9,250

Average savings

5,000+

Rebate applications submitted

Perfect for any space

Is a MiniSplit the right choice for your home?

Ductless mini splits connect indoor and outdoor units with a small conduit, making them ideal for older homes, additions, or rooms without existing ducts. Indoor air handlers can be wall-mounted, floor-mounted, or ceiling-cassette style, giving you options to fit any room layout. Cool (or heat, if you choose a model with heating) only the rooms you need. No more paying to condition empty spaces. With the compressor located outside and advanced fan technology inside, ductless mini splits help maintain a calm, comfortable atmosphere.

Know your options

Types of Mini-Split Systems

Mini-splits come in several form factors, and you can mix different types on the same outdoor unit. Ductless wall-mount units are the most common and affordable. They mount high on an interior wall and deliver air directly into the room. Ceiling cassettes flush-mount into a drop ceiling for a clean, commercial look. Floor-mount units sit at baseboard height, a good fit for rooms with large windows or limited wall space. Ducted mini-splits hide the air handler in a closet or attic and connect to short duct runs. You get the efficiency of a mini-split with no visible indoor unit. Hybrid systems combine multiple types on one outdoor condenser: ducted heads in the hallway, wall-mounts in the bedrooms, a cassette in the kitchen. Not sure which combination works for your home? Our comfort advisors assess every room during a free estimate and recommend the best fit. For a deeper dive into room-by-room sizing, see our mini-split sizing guide.

Mitsubishi Hyper-Heat H2i cold climate mini-split overview

Colorado climate matters

Standard vs Cold Climate Mini-Splits

Standard mini-split heat pumps operate efficiently down to about 30°F. Below that, their heating capacity drops and they rely on electric backup heat, which costs 2–3x more to run. Cold climate mini-splits (like Mitsubishi Hyper-Heat) maintain full heating capacity to -13°F using enhanced inverter compressors and vapor injection technology. In Denver, where winter design temperatures hit 5°F and overnight lows regularly dip into the teens, cold climate is the right choice for any heat-pump-only installation. Standard models still make sense for cooling-only applications or homes with a gas furnace for backup. Cold climate models also qualify for larger rebates: Xcel Energy's per-ton incentives require cold climate certification. The price difference is $500–$1,000 per zone, a small premium for all-winter reliability and bigger rebate checks.

Floor-mount mini-split unit replacing a boiler system

No ductwork required

Replacing Your Boiler with a Mini-Split

Many older Denver homes, especially in Capitol Hill, Park Hill, and Wash Park, have hot water boiler systems with radiators. When the boiler ages out, homeowners face a decision: replace with another boiler ($8,000–$15,000), add ductwork for a traditional furnace+AC ($15,000–$25,000), or switch to ductless mini-splits. Mini-splits are the natural fit for boiler homes because there's no ductwork to install. A 3-zone cold climate system covers the main living areas for $13,000–$20,000, delivers both heating and cooling (boilers only heat), and qualifies for electrification incentives from Xcel Energy and the state of Colorado. Zoned comfort is an upgrade over radiators: individual temperature control room by room, quiet operation, and built-in air filtration. The conversion is straightforward. We mount indoor heads on walls, run refrigerant lines through small 3-inch penetrations, and set the outdoor condenser on a pad outside.

Cooling-only ductless mini-split AC unit

AC without the ductwork

Cooling-Only Mini-Splits

Not all mini-splits are heat pumps. Cooling-only mini-split systems provide ductless air conditioning without heating capability. These AC-only units cost $500-$1,500 less per zone than heat pump models, making them an economical choice for Denver homes that already have a furnace. Perfect for adding cooling to garages, sunrooms, bonus rooms, or server rooms where you don't need heating. Since they only cool, there's no need for a cold-climate rating: they're optimized purely for summer comfort. In Colorado's dry climate with a shorter cooling season (June-September), cooling-only models make practical sense if you're satisfied with your existing furnace.

Cooling-only vs heat pump mini-split comparison

Making the right choice

When to Choose Cooling-Only vs Heat Pump Mini-Split

Choose a cooling-only mini-split only when Xcel Energy rebates don't apply to you (e.g., ineligible area or rebates already used) and you have a functioning furnace with no need for heating. Cooling-only units cost less at list price, but heat pump models with Xcel rebates can be cheaper out-of-pocket. Choose a heat pump mini-split if you're replacing your furnace too, want year-round comfort from one system, or want to maximize rebate opportunities: heat pump models qualify for larger incentives from Xcel Energy. For Denver homes with existing gas or electric heat, adding cooling-only mini-splits to strategic zones (master bedroom, home office, bonus room) provides targeted comfort without the expense of whole-home ductwork, but only when rebates don't apply. Heat pump models make more sense for new construction, major renovations, or replacing an aging furnace and AC simultaneously.

AnsweringYour Questions

Frequently Asked Questions

Common questions about ductless mini-split systems in Denver. Can't find what you're looking for? We're a phone call away.

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Ductless Mini-Split Installation

Ductless Mini-Split Installation

Ductless MiniSplit Installation

Ductless Mini-Split Installation

How It Works

What is a MiniSplit?

Why a Mini-Split is the Right Choice for Your Home

Perfect for Any Space

Zoned Comfort & Whisper-Quiet Operation

Energy Efficiency & Savings

Low Maintenance & Healthier Air

Plan Your Mini-Split Zones

Mini-Split Models We Install

Mitsubishi MSZ-GX

Mitsubishi MSZ-FX Hyper-Heat

Mitsubishi MXZ Multi-Zone

What People Wonder About MiniSplits

Why UniColorado?

Is a MiniSplit the right choice for your home?

Types of Mini-Split Systems

Standard vs Cold Climate Mini-Splits

Replacing Your Boiler with a Mini-Split

Cooling-Only Mini-Splits

When to Choose Cooling-Only vs Heat Pump Mini-Split

Frequently Asked Questions

Related Services

Heat Pump Installation

AC Installation

Furnace Installation