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.
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.
As far as price goes, I paid a higher flat fee 12 years ago from one of the larger local companies. I'm very impressed with pricing and quality of work.
I highly recommend Guthrie & Sons and Rob.
Christian and his crew did a great job on the install everything was smooth from start to finish.
I would definitely recommend this company here in Murrieta.
Please congratulate them for a job well done!
We worked with Vlad T., who had previously been out to our home and saved us tens of thousands of dollars by getting our existing AC unit up and running when other companies were pushing for a full replacement. That experience alone earned our trust.
Now that we’re finally ready to purchase new units, there was no question that Guthrie & Sons was the only company we would consider, and Vlad was the obvious choice. He was extremely professional, punctual, and exceptionally knowledgeable, taking the time to explain options clearly and thoroughly. His expertise and honesty made the entire process straightforward and stress-free.
If you’re looking for an HVAC company you can truly trust—one that values integrity, quality workmanship, and customer service—I cannot recommend Guthrie & Sons and Vlad T. highly enough. This is how service should be done.
I only wish the annual service was cheaper 🙂
Zach M. came by and installed on new one. He was extremely professional and completed the installation promptly.
This was another great experience all around and I gladly recommend Guthrie and Son's for all your HVAC needs.
- INSTALLATION
Up to $1,500 Off a New System
Receive up to $750 in manufacturer rebates and up to $750 discount from Guthrie. Valid on select systems. Must mention promotion at time of estimate appointment. Not valid on prior sales. Cannot be combined with any other offers. Restrictions apply. See dealer for details. Offer expires 7/31/2026.
- INSTALLATION
0% APR for 24 Months
Get 0% APR financing for 24 months on a new heating or air conditioning installation. 0% interest with 24 equal monthly payments.
Financing subject to credit approval. Valid on select systems only. 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 7/31/2026.
- 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 7/31/2026.
- WATER HEATER
Free Estimate on a New Heat Pump Water Heater Installation
Valid for an estimate for a new hybrid heat pump water heater installation or replacement.
Restrictions apply. See dealer for details. Offer expires 7/31/2026.
