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Affordable Plumbing, Heating & Air Conditioning

At Oasis Plumbing, Heating & Air Conditioning, we believe comfort should not come with a hefty price tag. Serving the heart of San Marcos, CA and surrounding area, we are committed to providing our community with top-tier HVAC & plumbing solutions that are both reliable and affordable. Whether you need an immediate plumbing repair, a summer cooling fix, or a cozy winter warmth setup, we ensure your home or business enjoys optimal comfort without stretching your budget. Experience the Oasis difference – where premium meets affordability.

Plumbing, Heating and Air Conditioning Services in San Marcos, CA
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Decades of experience and a commitment to excellence make Oasis a top choice for any HVAC or plumbing needs.

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Our promise is not just quality workmanship – it is your complete satisfaction. We stand by every service.

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Our flexible financing options are tailored to accommodate every client’s budget, ensuring you do not have to compromise on quality.

Best HVAC & Plumbing Company in San Marcos, CA

Welcome to Oasis Plumbing, Heating & Air Conditioning, your premier choice for HVAC and plumbing services in San Marcos, CA. We are dedicated to ensuring your home remains comfortable and efficient all year round.

Our HVAC services include expert AC installation, seamless AC replacement, and prompt AC repair. For advanced solutions, we offer ductless AC and mini-split installations. As winter approaches, rely on our professional heater and gas furnace installations, efficient furnace replacements, and reliable repairs. Our heat pump installations and replacements are perfect for eco-conscious homeowners. Additionally, we provide precise thermostat installations, thorough maintenance services, and optimized ductwork installations and replacements.

Oasis also offers comprehensive plumbing services. From routine maintenance and emergency repairs to new fixture installations, our experienced plumbers handle all your plumbing needs with care and precision.

Choosing Oasis means choosing excellence. We pride ourselves on our dedication to quality, customer satisfaction, and prompt service. Discover why homeowners in San Marcos trust us to keep their homes comfortable and systems running smoothly.

San Marcos HVAC Services

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Trusted HVAC & Plumbing Excellence in San Marcos: Experience the Oasis Advantage

100% Satisfaction Guarantee

Providing top-tier HVAC & plumbing services is our standard. With warranties that exceed the usual industry standards for both equipment and labor, our utmost priority is to ensure your complete satisfaction with every project.

Experienced & Knowledgeable

Boasting over three decades in the HVAC & plumbing fields, our team delivers unparalleled expertise to every task. Our commitment to ongoing training and learning guarantees state-of-the-art solutions and premier service for all your home comfort needs.

Fair, Upfront Pricing

Marrying excellent AC, heating & plumbing expertise with clear, upfront pricing is our pledge. You can anticipate competitive rates without any unexpected costs or hidden charges, and our install and replacement estimates will always be free!


We firmly believe that everyone deserves optimal indoor comfort, regardless of budget constraints. Explore our flexible financing options to ensure home comfort without the financial stress.

Above and Beyond Factor

Our dedication to excellence is not just about systems and solutions. It is about the relationships we build. Every interaction, big or small, is valued. We strive to ensure that everyone—whether a loyal customer or a first-time inquirer—feels the depth of dedication and expertise our team brings.

Give Us a Call! Or Let Us Contact You!
(619) 626-2499

    Ready to Get Started?

    Schedule Appointment

    Contact us to schedule your in-home free consultation.


    Home Evaluation & Customized Plan

    We will help you to determine the best system for your home based on your needs, space, and budget.


    Install & Execute

    Our team will install the system of your choice and ensure it works perfectly.

    Don’t Listen to Us.
    Listen to Our Past Clients.

    Vinny B
    Vinny B
    Can't say enough good about this company. They worked with me on price and they offered a labor warranty much longer than the other companies. They are masters at the craft to as they addressed all the old issues I had with the system that was replaced. The new system is working great. They replaced both my heater and air conditioner and did it all in a day. Appreciated the follow up to see how everything is going as well. Get a quote from Oasis for any hvac project. I'm glad I did.
    Paloma Santiago
    Paloma Santiago
    This review is long overdue but I have had time to enjoy our new ac and heater that Oasis heating and air conditioning installed a few months ago. We saw one of their ads on Facebook and requested someone to contact us. We contacted a few companies from ads we saw. Oasis immediately stuck out to us because the gentleman who came showed us their license card when we came to the door. None of the other companies did that so it was different but it was also reassuring since we knew we were making a big investment in our home. One of the issues with our previous system was the poor air flow in our master bedroom. Michael was the only one to recommend increasing the vent to help. Instead of just giving us a quote really quick we could tell he listened to what we talked about and was really trying to fix the issues we had with the old system. They weren’t the lowest bid although close but they were nowhere close to the highest either. Overall we felt most comfortable with Oasis. The install was completed in two days and we have used our ac on many occasions since and weak airflow is fixed. I also tested out the furnace the other morning for the first time too. We are thankful to have found this company and have recommended them to a few other friends and family.
    Beata Zabnicka
    Beata Zabnicka
    Response time is great and very professional!
    Armando Acuna
    Armando Acuna
    Oasis was able to come out for an estimate the same day that I found them on Google. The guy who came out was here longer than some of the other companies sales people and he explained that they try to do as thorough of an inspection as possible when providing an estimate. He went into the attic to check out my old system while some others didn’t. Given the amount of time he dedicated just for a free estimate I was expecting the price to be high. It was quite the opposite and more competitive than most. It wasn’t the lowest but they quoted me the brand I mentioned and most of all I felt confident they would do good work given the effort they put into the estimate. The install was schedule and completed a few days later and everything is working perfectly. The house cools really quick and the system very quiet. I recommended them to a friend already and am glad I found them.
    K G
    K G
    I have been needing to upgrade my home air conditioning system for the past few years and have been putting it off. Instead of doing a repair this year I decided to get a whole new system. I interviewed several companies and decided on Oasis. I was somewhat nervous since they are a new company but that quickly went away. They communicated well, finished the job on time and showed me how to use the thermostat. Also they tested the system afterward while they cleaned up to make sure everything worked. I’m happy I gave them the chance. :)
    michael hurtado
    michael hurtado
    I found Oasis when looking up someone to replace my AC. They were able to give me an estimate that same day and then install everything even that same week. Everything is working perfectly. Appreciate them being so fast so I could stay cool during the heat wave.
    Josh Sotelo
    Josh Sotelo
    Got in touch with oasis when my ac unit suddenly went out. They showed up within a few hours and fixed the issue. Unit is still working and price was reasonable. Give them a call if you need help.

    areas we serve

    • Alpine
    • Bonita
    • Bonsall
    • Cardiff by the Sea
    • Carlsbad
    • Chula Vista
    • Coronado
    • Del Mar
    • El Cajon
    • Encinitas
    • Escondido
    • Fallbrook
    • La Jolla
    • La Mesa
    • Lake Elsinore
    • Lakeside
    • Lemon Grove
    • Menifee
    • Murrieta
    • National City
    • Oceanside
    • Pala
    • Poway
    • Ramona
    • Rancho Santa Fe
    • San Diego
    • San Marcos
    • Santee
    • Solana Beach
    • Spring Valley
    • Temecula
    • Valley Center
    • Vista
    • Wildomar