Ductless Mini Split Installation

Ductless Mini Split Installation in San Diego County for Energy Savings and Everyday Comfort

Many San Diego homes don’t have central air—but that doesn’t mean it doesn’t get hot. If you’ve got a warm bedroom, a stuffy garage, or another room that never feels the right temperature, a ductless mini split installation from Guthrie & Sons can solve all of your heating and cooling problems.

Take Control of Your Climate With a Ductless Mini Split Installation

You’ve seen the sleek wall-mounted units in homes and shops all over San Diego.
Those are ductless mini splits, and they might be exactly what your space has been missing.
They’re perfect for rooms that run too hot, too cold, or never feel quite right.

Whether you’re building new, renovating, or outfitting a rental or property you manage,
ductless mini splits offer the flexibility and comfort you need without a big renovation bill. Because unlike traditional HVAC systems, they don’t need any ductwork—just a small indoor unit, a compact outdoor compressor, and a simple connection between the two.

Even better? Many systems qualify for federal tax credits and local energy rebates, which can help lower your upfront cost and boost your long-term savings.

At Guthrie & Sons Heating, Air & Solar, we specialize in ductless mini split installation in San Diego County and nearby areas like Temecula and Murrieta, and we’ll help you navigate rebates and tax credits to find every possible way to save. Give us a call or schedule your free quote online—we’ll help make your home feel just right!

How Does a Ductless Mini Split Work?

A ductless mini split system has two main parts: a quiet indoor unit mounted on the wall and a small outdoor compressor. These two components are connected by a narrow line that carries refrigerant, power, and drainage. The indoor unit pulls in air, conditions it, and pushes it back out at the perfect temperature.

Because each unit operates independently, you can control the comfort of one room without affecting the rest of the house. That means better efficiency, lower energy bills, and targeted heating or cooling right where you need it. There are ductless mini split air conditioners that only cool, and ductless mini split heat pumps that both heat and cool—we install both based on what you need.

Where Can a Ductless Mini Split Be Installed?

Basically anywhere! Whether you choose a ductless mini split air conditioner or a ductless mini split heat pump, these systems can be installed in all kinds of spaces in both homes and businesses.

Converted garages or workshops
Home offices and upstairs bedrooms
Guest houses, pool houses, or detached studios
Older homes with no ductwork
Add-ons and sunrooms
Rental properties or ADUs
Living rooms or open-plan spaces that need a boost
Server rooms or equipment areas that need year-round cooling

We offer free quotes, an online quoting tool, and financing to help with your ductless mini split installation cost, which can range from a few thousand to several depending on the setup.

Installing a Ductless Mini Split? What to Know Before You Buy

Your heater still works just fine, so why replace the whole system just because the AC gave out? That’s one of the many reasons San Diego homeowners are turning to a ductless mini split AC installation. They’re a great way to cool down a room—or your whole home—without messing with anything else.

Or maybe you’re building new and want a system that heats and cools without installing central air and heating at all. Either way, you get a great system that cuts energy waste and keeps costs low. Here’s what to look for when picking the right one:

This one’s all about how efficiently your system cools. A higher SEER (Seasonal Energy Efficiency Ratio) rating means your mini split uses less energy to get the job done, which can save you real money over time. Most ductless systems start around 18 SEER, and some go into the 20s. If you want a cooler home and a lower energy bill, this is the number to watch.

If you’re looking at a ductless mini split heat pump, check the HSPF (Heating Seasonal Performance Factor) rating too. It measures how efficiently the system heats your space. Even with San Diego’s milder winters, a higher HSPF means more warmth for less energy.

Some ductless systems are perfect for a single room—like a hot bedroom, home office, or garage. Others are built to handle multiple zones with several indoor units connected to one outdoor compressor. Whether you need to cool one space or your whole home, we’ll help you choose a setup that fits.

A lot of newer ductless units come with Wi-Fi, smartphone apps, and energy-saving modes. Want to cool the room before you get home? Set a schedule? Track how much energy you're using? We’ll point you to the features you’ll actually use—not just bells and whistles that cost more.

Thinking about installing a mini split yourself? We get it—those online tutorials make it look so easy. But if you install your own mini split, you could run into refrigerant leaks, wiring problems, or even void the warranty. You can easily damage the system, your home, or yourself! Let our licensed, insured, and NATE-certified technicians handle it for you. We’re an experienced ductless mini split installation company that does this practically every day.

Ductless Mini Split Services When and Where You Need Them

No matter where you are in San Diego County, chances are we’ve got a truck nearby. On any given day, our team is out handling ductless mini split services from Oceanside to Chula Vista.

Like any HVAC system, your mini split will need service at some point. Over time, you might notice it’s not cooling as well, making weird noises, or flashing an error code. That’s your sign to call us for ductless mini split repair service. We handle it all—filter swaps, coil cleanings, refrigerant checks, and full system diagnostics.

Want to avoid breakdowns altogether? Regular mini split maintenance makes all the difference. Keep your filters clean at home, and schedule a professional tune-up at least once a year. To make it easy, we offer our USA Membership Plan, with options built specifically for ductless systems. You’ll get priority service, discounts, and worry-free maintenance all in one. Just ask—we’ll help you get signed up.

Real Reviews From Real Customers

We do things differently, and our customers appreciate it. See what some of our thousands of satisfied customers have to say about working with us.

Dianne Haase

20:57 02 May 25

Great customer service, technicians always on time and friendly. I’ve had my new hybrid heat pump for a few years and Guthrie & Sons are very proactive making sure everything is running smoothly. Very happy in my decision to use them!

Andrea Kossoudji

01:11 30 Apr 25

Great service!! Jonathan was patient, kind, knowledgeable and extremely professional! I love Guthrie & Sons’ reminder system, notification of the technician enroute, the easy invoice system and immediate emailing of the findings, including detailed photographs of the work completed!! Highly recommend!

james beedon

20:47 23 Apr 25

Last summer my air conditioner couldn't cool the house in the hottest period of summer. The HVAC team I was working with came in and said the coils were leaking, the unit was 20 years old. I requested quotes from 5 different companies, and the variation of prices was huge. I went with Guthrie and Sons for these reasons:1. Local Company2. Family Owned3. Great presentation, no pressure4. Good products5. Competitive pricingJust installed yesterday, so jury is still out on the system, but installation was thorough and great communication so far!

Darius Degher

21:45 22 Apr 25

Carson and Michael were brilliant. The heat pump installation went smoothly, and they are really pleasant and trustworthy fellows. The day after it was installed, I had a plumber at my house. He looked at their work and was impressed. He said it was much cleaner than the way HVAC people usually do it.

Lito Ricasata

19:03 08 Apr 25

First time prospective client of Guthrie and Sons. Very responsive staff in providing updates on my calls. Mario F. came over to check out my existing cooling and heating system and is very thorough and professional in providing necessary information related to repair/upgrades. Pending his quote, my experience with Guthrie and Sons is top notch and most highly recommended.Updated review: Kareen, Daniel and Michael worked on the AC replacement, relocation of furnace to the attic and replacement of ductwork. Very professional and knowledgeable team in my opinion. Completed the work in a timely and very satisfactory manner.

Michael Myers

00:19 25 Mar 25

My experience with Guthrie & Sons has been excellent, and I am pleased to write a very favorable review about it. They replaced three air conditioners and three propane furnaces with new equipment that utilizes heat pump technology. I had met with other companies and I was close to coming to a conclusion, when a friend recommended Guthrie & Sons. He told me that they are hyper focused on customer service from beginning to end.Their customer service started with the on line completion of a basic information form. Shortly after submitting that form, I heard from Zach who scheduled an appointment at my home.I had already met with three other HVAC contractors, and for that reason, I had some basic information about the systems available and how heat pumps work and whether propane furnaces should also be installed. I signed a contract on a Friday. By Wednesday of the next week they had completed the installation. Wow.The installation of one of the furnaces in the attic caused minor damage to the drywall. THEY BROUGHT IT TO MY ATTENTION and told me a drywall contractor would be in touch regarding its repair. Two days later it was repaired.Since installation, the equipment (heat pumps from Bosch) has been working great and I am optimistic about the future. Meanwhile, their pricing, warranty and terms are far superior to their competitors.Since this is an unusually long review and so favorable, let me add this: This is my honest, uncompensated opinion. I have no relationship with anyone at Guthrie & Sons other than the contract we executed.

Tom H

15:21 20 Mar 25

We recently had Guthrie and Sons install a Mini-Split system in our home. The entire process was handled professionally with no issues occurring at any time. The estimator (Vlad) went through options with us but let us evaluate the best solution for us with zero pressure. The installation team (Matthew and Aaron) showed up on time, reviewed the scope of the job, made sure they understood what we wanted, and then proceeded to complete the installation exactly as discussed. They asked for my input as needed so there were no surprises when the job was completed.They respected my property and made sure everything was left at least as clean was when they arrived. The job was completed on time and as promised and they reviewed the details of the system and its use clearly. I would definitely have Guthrie and Sons do other electrical/HVAC work should the need arise.

Mike Macias

19:43 19 Mar 25

I have been in the construction industry in San Diego for over 50 years. I owned my own contracting company for over 40 years. I have seen all levels of customer service in my years. The level of customer service from Guthrie and Son’s is among the best I’ve ever seen and received. Every time I hear anyone asking for a referral for HVAC work I immediately give them your number. When I recommend a company I in essence am putting my name and reputation on the line. I refer them with 100% confidence in the service they will receive. Thank you very much for your legendary service.

Scott Sypkens

23:32 11 Mar 25

We first hired Guthrie and Sons to replace a furnace after comparing proposals from several heating and air companies. They’ve since been back for annual check ups, and today Kareen came to diagnose and resolve an issue with our mini-splits. My experience each time, including today, is that they hire friendly, knowledgeable people who do good work. They’ve never tried to upsell or do anything unnecessary, which is the way it should be. I’d recommend them to anyone who asks.

Marilyn Rivas

20:07 09 Mar 25

They always come out quickly. They are so polite and careful.

Steven Wheeler

19:28 07 Mar 25

Good technician did everything right yet our heater still not workingJonathan gave us the likeliest problems so we’ll have to get it fixed

Dmitriy

04:01 07 Mar 25

My AC was not working for seven months. Three other companies tried to fix it with no success. Don’t make the same mistake I did—go straight to Guthrie & Sons! They are absolutely worth every penny.

Cecilia Benevich

22:17 05 Mar 25

Rick

21:38 05 Mar 25

Experienced technician gave me the particulars of a replacement HVAC system

Daylan Dauchot

21:28 05 Mar 25

Courteous, in-time, helpful, honest. Would recommend.

Xinxin Wang

22:05 04 Mar 25

Tom Barden

18:26 04 Mar 25

Adair Cooke

19:02 03 Mar 25

Jonathon is a great technician. He is very willing to answer any questions and explains things very well. He is very transparent with letting us know cost, finance options, different furnace models and anything else we want to know. I would highly recommend him to anyone looking for furnace repair or replacement.

Bratso Krsic

00:29 28 Feb 25

Guthrie and Sons took on the challenging project of installing an HVAC system at St. George's Serbian Orthodox Church of San Diego, CA. They were the only company among the six we consulted that saw the project through to the end. The members of our congregation are not just happy, but thoroughly satisfied with the heating and air conditioning. The system, split units/floor units with condensers outside, was installed with minimal intrusion onto the church's artwork. Despite the project taking longer than expected due to permit delays, the results were well worth the wait. We highly recommend Guthrie and Sons Heating and Air.

Jennie Cornsweet

00:10 28 Feb 25

Have been using Guthrie & Sons for several years now and purchase my new HVAC system with them. They do our yearly maintenance and have always been professional, efficient and reliable. Jonathan was the tech that came today and I want to thank him for his great work and great attitude.

Frequently Asked Questions

Absolutely. In San Diego’s mild climate, a ductless mini split heat pump can easily handle both heating and cooling. It’s energy-efficient, quiet, and doesn’t need ductwork—perfect for older homes, additions, or replacing outdated systems. You’ll get comfort year-round without the bulk or hassle of central HVAC.

It depends on the system, but most setups can handle between two and five indoor units per outdoor unit. That means you can heat or cool multiple rooms individually from one system. We’ll help design the right layout based on your space and needs.

Ductless systems are super quiet—seriously. The indoor units usually run between 19–30 decibels, which is softer than a whisper. The outdoor units are also designed for low-noise operation, so they won’t disturb you or your neighbors.

Most homeowners see real savings—sometimes 20–40%—especially if you’re replacing older or inefficient systems. Ductless units use less energy and only heat or cool the rooms you actually use. That adds up to lower utility bills and more efficient comfort.

WATER HEATER

$2,600 Federal Tax Credit on Heat Pump Water Heater

Valid on a qualifying heat pump water heater installation with electrical panel upgrade. Up to $2,000 (30% of cost) in Federal Tax Credits for a heat pump water heater and up to $600 (30% of cost) for an electrical panel upgrade. Can be combined with state rebates only. Restrictions apply. See dealer for details.

INSTALLATION

Up to $11,750 Off a New System*

Qualify for HEEHRA and you can get up to $8,000 in HEEHRA rebates, up to $1,150 in manufacturer rebates and up to $2,600 in Federal Tax Credits for a total of up to $11,750 off a new installation. Valid on residential properties only. Cannot combine with any other offers. Must mention promo at time of estimate appointment. Restrictions apply. See dealer for details. Offer valid until funds last.

REPAIR

Free Diagnostic w/ a Repair

Your diagnostic service call fee will be waived if you proceed with a repair. Cannot combine with other offers. Restrictions apply. See dealer for details. Offer expires 5/31/25.

INSTALLATION

0% APR for 25 Months

Get 0% APR financing for 25 months on a new heating or air conditioning installation. 0% interest with 25 equal monthly payments. Financing subject to credit approval. Valid on residential properties only. Cannot combine with other offers. Must mention promo at time of estimate appointment. Restrictions apply. See dealer for details. Offer valid for an estimate appointment scheduled before 5/31/25.

Interested in a Ductless Mini Split Installation? Request a Quote!

Looking for real help—not a sales pitch? Guthrie & Sons Heating, Air & Solar offers dependable ductless mini split installation services with clear pricing, clean installs, and no pressure. We’re local, family-owned, and known for doing things the right way. Call our office or use our website to get the ball rolling on your ductless mini split installation in San Diego, California, or the surrounding areas today.

8248 Ronson Road
San Diego, CA 92111

(619) 269-3013

Ductless Mini Split Installation