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Blue Diamond Heating and Air

Quality Service at the Best Rate. Guaranteed.

Our team is prepared to take care of all your A/C and heating needs, including residential ductless mini-splits, new installations, routine service, and indoor air quality.
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“There are a lot of different ways to do a job; there’s only one way that is right.”

San Diego’s Best Choice For Heating & Cooling

We are Blue Diamond, a company with a home-town heart. We’re passionate about making the world a cozy place to live. Whether we’re heating or cooling we take great pride in keeping our customers comfortable and satisfied.

Our team is outfitted and trained to take care of all your HVAC needs, specializing in installation, replacement, repair, and other HVAC services.

With over 20 years of experience, we are committed to excellence in every aspect of our business. Our El Cajon HVAC Company is ready to answer any questions you may have, and make you and your family as comfortable as possible. Call (619) 514-2114 now!

Blue Diamond Heating and Air
609 Cedar St
El Cajon, CA 92021
(619) 514-2114

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Our Services

AC Repair
AC Installation
Air Duct Repair
Indoor Air Quality
Heating Repair
Heating Installation
Ductless Mini-Split
Heat Pump Installation

Air Conditioning Repair

When our certified techs are at your house, you can expect they’ll be able to repair your AC unit. And they’ll have your home looking just like when they showed up.
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Air Conditioning Installation

When our certified techs are at your house, you can expect they’ll know how to get your unit up to optimal performance. Even more, you can feel confident knowing you’re working with a fully licensed, bonded and insured company.
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Air Duct Repair, Replacement, and Installation

We are proud to be the experts in duct repair and installation! Every new design is backed by a 100% Satisfaction Guarantee and a Lifetime Workmanship.

Each new design incorporates the use of metal Y Branches (TWYE’S) and AirFlow Distribution Dampers to help navigate airflow. This also allows us to make room to room adjustments which are free of charge. We give you two different options for ductwork (basic or eco) giving you the ability to design based on cost or performance.
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Indoor Air Quality Improvement with UV Lights

Homeowners who are seeking to enhance their indoor air quality are always looking for effective solutions for their HVAC systems. You might have heard using ultraviolet (UV) light is a good, efficient way to fight airborne germs, bacteria and mold.

UV lights are a solution you can add to new or pre-existing heating and cooling systems. They are a strong resource in your search for healthier, cleaner air in your home or business. Let’s go over this germ-fighting equipment.
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Heating & Furnace Repair

Our experts have completed extensive testing to earn HVAC’s diamond standard, NATE certification. Meaning they can manage most any heating repair.

Blue Diamond Heating and Air has the expertise to get the repairs done right the first time. And you can relax knowing our furnace repairs are backed by a 100% Satisfaction Guarantee* for a year.
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Heating & Furnace Installation

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 Ductless Mini-Split A/C

Ductless, mini split-system air-conditioners (mini splits) have numerous applications in residential, commercial buildings. The most common applications are in multifamily housing or as retrofit add-ons to houses with "non-ducted" heating systems, such as space heaters or wall heaters. They can also be a good choice for room additions and small apartments, where extending or installing supply ductwork (for a central air-conditioner or heating systems) is not feasible.
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Heat Pump Installation

HVAC heat pumps are an innovative and energy-efficient technology that offers numerous benefits for both residential and commercial spaces. Unlike traditional heating and cooling systems, heat pumps work by transferring heat rather than generating it, making them highly efficient. Additionally, heat pumps deliver consistent and comfortable heating and cooling throughout the year by extracting heat from the outdoor air during winter and transferring it indoors, and vice versa during summer.


Don't take our word for it, see what our customers have to say! All reviews are pulled from third-party review sources, which you may check for yourself at the links below.
Reviews on Google
Reviews on Yelp
  • "Quality work at an affordable honest price. These guys know their business. No one likes to hear that there AC needs repair but with the summer here it needed to get done. Blue Diamond was on it! My wife does daycare out of our home and we need a climate controlled environment for that....these guys spent a very long day making sure the AC was functioning properly before they left. We appreciated the urgency to get our AC back up and running and dedication to finish the job quickly.
    There was a lot of work that needed to be done. Thank you"

    Ryan J.

  • "Positive: Professionalism, Punctuality, Quality, Responsiveness, Value
    Great experience with Blue Diamond. It was a lot cheaper than I thought it was going to be and I felt like I was well taken care of. Brian and his team really seem like they actually care which is rare these days. 10/10 would definitely recommend"

    Eric V.

  • "Positive: Professionalism, Punctuality, Quality, Responsiveness, Value
    Donovan is the owner, he came personally to do my heater and air conditioner check up, he was very professional, on time, and even sends texts so I wouldn’t forget he was coming. He was in a uniform with a marked truck, put on shoe covers to come in my house, he took the time to talk me through everything he noticed and gave recommendations, which I didn’t feel were up selling, but, rather to keep my systems going strong.
    They offer a yearly membership so you don’t need to think about your maintenance, which I love! So easy!
    I am very impressed with Blue Diamond!"

    Jessy S.

Our Guarantees

Learn about our Diamond Guarantees, applicable to all services we offer.
  • Buy It Back Guarantee

    If you are not fully satisfied with the system we have installed or the services we provide during the first year, let us know and if we can't make it right, we will buy your system back.

    Diamond Pro Guarantee

    We promise that all of our representatives in your home will be clean, courteous, and attentive to your needs. They will have passed an extensive substance screening and a national criminal background search. They will be factory trained to work on your specific new system.

    No Excuses Guarantee

    Blue Diamond guarantees that your home comfort system will work properly. If for any reason, the system does not perform to specifications, we will fix it or refund your money. No excuses.

    Our commitment to our customers remains long after the installation date. We proudly extend to all our valued clients who are members of our Diamond Membership, a lifetime of no overtime service support! This means that seven days a week, we will deliver our expert service when you want it, need it, and at your convenience, not at your leisure. You'll never pay extra over the life of your system; this benefit can add up to hundreds of dollars in future savings.


    If you are not 100% pleased with the quality and craftsmanship of your installation, we will do whatever it takes to ensure your total satisfaction.


    You, the client, do not have to bear the responsibility for determining the correct equipment size, type, application and/or installation procedures. The product(s) installed will cool/heat your home as designed, or be replaced at no charge with the appropriate components.

    Blue Diamond guarantees our low prices. Therefore, if you find a lower price on an "apples-to-apples" system, we'll match the price and refund you the difference.


    All property such as lawns, shrubbery, carpeting, floors, walls, furniture and door frames are protected. Damaged property will be replaced or repaired. Protective shoe covers and hall runners will be used on all work and traffic areas.


    This means that if the compressor - the heart of your system - fails twice during the first five years of operation, Blue Diamond will replace the whole outside unit, with a new one - the same unit or a better one - free of charge to you. Not just the compressor - the whole outside unit! If the heat exchanger - the heart of your new furnace - fails in the first 10 years, we will replace the furnace with a new one - the same unit or a better one - free of charge to you.
  • $500 NO WORRIES 1ST

    If your heating or cooling system that we installed breaks down and fails to heat and/or coot your home during the first year, leaving you without heating or cooling, we will fix for FREE within 24 hours, including all parts and labor. Plus we will write you a check for $100 per day that your system is not repaired
    for your inconvenience, up to $500 towards any new equipment or service we offer. No frustration, peace of mind.


    We guarantee that the system of systems that we design and install in your home will heat and cool your home as we have stated. If, from the date of complete system replacement with all recommended duct modications and system enhancements installed for a period of (5) years the temperature range we have promised is not achieved, we will replace the system at no charge.

HVAC Blog & News

Have questions about ventilation? Want to learn how to do some maintenance yourself? Check out our blog!
August 30, 2021
Santee, California's Best Attractions

Santee Lakes is a pleasant outdoor environment where you may go hiking, bicycling, boating, fishing, or camping. The Creation and Earth History Museum is one of Santee's most unusual attractions, with exhibits based on the biblical account of creation. With so much to do, you'll have a hard time deciding how to spend your time […]

August 30, 2021
The Best Attractions and Activities in La Mesa, California

La Mesa, located nine miles east of downtown San Diego, is not your standard Southern California suburb. This town is only 20 minutes from San Diego and has amazing natural beauty, a pleasant temperature, and a plethora of unique and authentic stores. Find out more about what La Mesa has to offer by reading on. […]

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